A communication system

Abstract

The present application provides a communication system, relating to the field of communication technology, for reducing connection delays and call delays during international call transfers and improving user experience. The communication system includes: an international gateway switching device connected to multiple provincial / autonomous region-level long-distance tandem devices, the provincial / autonomous region-level long-distance tandem devices connected to other provincial / autonomous region-level long-distance tandem devices with direct circuits, a municipal traffic tandem device and a provincial / autonomous region-wide gateway switching device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, multiple municipal / state / league-level long-distance / local traffic tandem devices and municipal / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital regions of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, and a regional long-distance tandem device connected to the municipal traffic tandem device and municipal gateway switching device where the regional long-distance tandem device is located.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication system. Background Art

[0002] Currently, domestic operators' international communications tandem layout follows this pattern: international gateway switches receive international calls, transfer them to regional toll tandems, which then transfer them to the provincial / autonomous region-level toll tandems to which the international calls belong. These provincial / autonomous region-level toll tandems then transfer them to city / state / league-level toll / local tandems, or else transfer them through city / state / league-level toll / local tandems and then to city / state / league-level gateway switches. Consequently, international calls from China to other countries also undergo these steps, resulting in frequent transfers, long connection and call delays, and poor user experience.

[0003] Therefore, how to reduce the connection delay and call delay of international traffic while reducing the number of transfer ports of communication equipment is a problem that needs to be solved. Summary of the Invention

[0004] The present application provides a communication system for solving the problems of high connection delay and call delay, multiple transfer ports of communication equipment, and poor user experience during international call transfer.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] The present application provides a communication system, including:

[0007] International gateway switching devices, multiple regional long-distance tandem devices, multiple provincial / autonomous region-level long-distance tandem devices, multiple city-level traffic tandem devices belonging to provincial capitals / capitals, and multiple city / state / league-level long-distance / local call tandem devices belonging to non-provincial capitals / non-capitals;

[0008] The international gateway switching device is connected to multiple regional toll-free tandem devices and multiple provincial / autonomous region-level toll-free tandem devices. The provincial / autonomous region-level toll-free tandem devices are connected to the regional toll-free tandem device to which the provincial / autonomous region-level toll-free tandem device belongs, other provincial / autonomous region-level toll-free tandem devices with direct circuits, the municipal traffic tandem device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level toll-free tandem device is located, and multiple municipal / state / league-level toll-free / city traffic tandem devices that are not provincial capitals / capitals of the province / autonomous region where the provincial / autonomous region-level toll-free tandem device is located. Multiple regional toll-free tandem devices are connected to each other, and the regional toll-free tandem device is connected to the municipal traffic tandem device where the regional toll-free tandem device is located.

[0009] An international gateway switching device is used to receive international incoming traffic and transfer the international incoming traffic to a provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the international incoming traffic belongs, or to transfer the international incoming traffic to a regional long distance tandem device of the region to which the recipient of the international incoming traffic belongs;

[0010] The provincial / autonomous region-level long-distance tandem device is used to, upon receiving international incoming traffic and if the carrier to which the recipient of the international incoming traffic belongs is the same as the carrier to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the international incoming traffic to a municipal-level traffic tandem device in the provincial capital / capital city of the province / autonomous region to which the recipient of the international incoming traffic belongs, or to transfer the international incoming traffic to a municipal / state / league-level long-distance / local traffic tandem device in a non-provincial capital / non-capital city of the province / autonomous region to which the recipient of the international incoming traffic belongs;

[0011] The regional long distance tandem device is used to transfer international incoming traffic to the municipal traffic tandem device located at the location of the regional long distance tandem device of the region to which the recipient of the international incoming traffic belongs upon receiving the international incoming traffic;

[0012] City / state / league-level long-distance / local call tandem equipment is used to transfer international incoming call traffic to the recipient of the international incoming call traffic upon receiving the traffic;

[0013] The municipal traffic tandem device is used to transfer the international incoming traffic to the recipient of the international incoming traffic when receiving the international incoming traffic.

[0014] The technical solution provided by the present application brings at least the following beneficial effects: when transferring international incoming calls, the international gateway switching device is directly connected to the provincial / autonomous region-level long-distance tandem device, and there is no need to transfer all international incoming calls through the regional long-distance tandem device as in the related art. This not only saves the transfer ports of the regional long-distance tandem device, but also reduces the delay in the international call transfer process, which can improve the user experience.

[0015] Optionally, the communication system also includes a provincial / autonomous region gateway switching device belonging to a provincial capital / capital, multiple city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and a city-level gateway switching device belonging to the location of a regional long-distance tandem device. The provincial / autonomous region-level long-distance tandem device is respectively connected to the provincial / autonomous region gateway switching device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, and multiple city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located. The regional long-distance tandem device is connected to the city-level gateway switching device belonging to the location of the regional long-distance tandem device. The provincial / autonomous region-level long-distance tandem device is also used to, when receiving international input traffic and the operator to which the recipient of the international input traffic belongs is different from the operator to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the international input traffic to the provincial / autonomous region-level gateway switching device to the province / autonomous region to which the recipient of the international input traffic belongs, or transfer the international input traffic to the provincial / autonomous region-level gateway switching device to the province / autonomous region to which the recipient of the international input traffic belongs, or transfer the international input traffic to the provincial / autonomous region-level gateway switching device to the province / autonomous region to which the recipient of the international input traffic belongs. The international input traffic is transferred to the city / state / league-level gateway switching device of the province / autonomous region to which the recipient of the international input traffic belongs; the gateway switching device within the province / autonomous region is used to transfer the international input traffic to the province / autonomous region-level gateway switching device of the operator to which the recipient of the international input traffic belongs upon receiving the international input traffic; the city / state / league-level gateway switching device is used to transfer the international input traffic to the city / state / league-level gateway switching device of the operator to which the recipient of the international input traffic belongs upon receiving the international input traffic; the regional long-distance tandem device is further used to transfer the international input traffic to the city-level gateway switching device of the regional long-distance tandem device of the region to which the recipient of the international input traffic belongs when receiving the international input traffic and the operator to which the recipient of the international input traffic belongs is different from the operator to which the regional long-distance tandem device belongs; the city-level gateway switching device is used to transfer the international input traffic to the city-level gateway switching device of the operator to which the recipient of the international input traffic belongs upon receiving the international input traffic. In this way, compared with the transfer method in the related art in which the provincial / autonomous region-level long-distance tandem device first transfers the international input traffic to the city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device transfers the international input traffic to the city / state / league-level gateway switching device, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level gateway switching device, reducing the transfer process of the city / state / league-level long-distance / local call tandem device.When the recipient of international input traffic belongs to the location of the regional long-distance tandem device, the regional long-distance tandem device directly transfers the international input traffic to the municipal gateway switching device where the regional long-distance tandem device is located, without the need to transfer through the municipal traffic tandem device where the regional long-distance tandem device is located. This reduces the connection delay and call delay of international input traffic from different operators, and also saves the transfer ports of the city / state / league-level long-distance / local traffic tandem devices and the municipal traffic tandem devices where the regional long-distance tandem device is located.

[0016] Optionally, the city-level traffic tandem device is further used to, when receiving international outgoing traffic from a user located in the provincial capital / capital city to which the city-level traffic tandem device belongs, or a user roaming to the city-level traffic tandem device, transfer the international outgoing traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the city-level traffic tandem device belongs, or transfer the international outgoing traffic to the regional long-distance tandem device to which the city-level traffic tandem device belongs; the city / state / league-level long-distance / local call tandem device is further used to, when receiving international outgoing traffic from a user located in the city / state / league-level long-distance / local call tandem device, or a user roaming to the city / state / league-level long-distance / local call tandem device When a user of the device dials out international outbound traffic, the outbound traffic is transferred to the provincial / autonomous region-level long distance tandem device in the province / autonomous region to which the city / state / league-level long distance / city tandem device belongs. The provincial / autonomous region-level long distance tandem device is also configured to transfer the international outbound traffic to an international gateway switching device upon receiving it. The regional long distance tandem device is also configured to transfer the international outbound traffic to an international gateway switching device upon receiving it. The international gateway switching device is also configured to transfer the international outbound traffic to an international gateway switching device in the country to which the recipient of the international outbound traffic belongs upon receiving it. In this way, when transferring international outbound traffic, the international gateway switching device directly connects to the provincial / autonomous region-level long distance tandem device, eliminating the need to transfer all international outbound and inbound traffic through the regional long distance tandem device as in related art. This not only saves transfer ports on the regional long distance tandem device, but also reduces delays during international call transfer, thereby improving the user experience.

[0017] Optionally, the provincial / autonomous region-level long-distance tandem device is also used to, when receiving domestic long-distance incoming traffic and the operator to which the recipient of the domestic long-distance incoming traffic belongs is the same as the operator to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the domestic long-distance incoming traffic to the municipal-level traffic tandem device of the provincial capital / capital city of the province / autonomous region to which the recipient of the domestic long-distance incoming traffic belongs, or to transfer the domestic long-distance incoming traffic to the municipal / state / league-level long-distance / local traffic tandem device of a non-provincial capital / non-capital city of the province / autonomous region to which the recipient of the domestic long-distance incoming traffic belongs; the municipal-level traffic tandem device is also used to, when receiving domestic long-distance incoming traffic, transfer the domestic long-distance incoming traffic to the recipient of the domestic long-distance incoming traffic; the municipal / state / league-level long-distance / local traffic tandem device is also used to, when receiving domestic long-distance incoming traffic, transfer the domestic long-distance incoming traffic to the recipient of the domestic long-distance incoming traffic. In this way, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level long-distance / local call tandem device. When transferring domestic long-distance incoming calls, if the operator to which the recipient of the domestic long-distance incoming calls belongs is also the first operator, the provincial / autonomous region-level long-distance tandem device can directly transfer the domestic long-distance incoming calls to the corresponding city / state / league-level long-distance / local call tandem device, and then transfer it to the recipient of the domestic long-distance incoming calls, thereby meeting the user's demand for domestic long-distance incoming calls.

[0018] Optionally, the communication system further comprises a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and the provincial / autonomous region-level long-distance tandem device is connected to a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities in the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located; the provincial / autonomous region-level long-distance tandem device is further used to, when receiving domestic long-distance input traffic and the operator to which the recipient of the domestic long-distance input traffic belongs is different from the operator to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the domestic long-distance input traffic to the provincial / autonomous region-level capital city / capital city of the province / autonomous region to which the recipient of the domestic long-distance input traffic belongs. A gateway switching device within an autonomous region, or a gateway switching device at the city / state / league level that transfers domestic long-distance incoming traffic to a non-provincial capital / non-capital city of the province / autonomous region to which the recipient of the domestic long-distance incoming traffic belongs; a gateway switching device within a province / autonomous region, used to transfer domestic long-distance incoming traffic to the gateway switching device within the province / autonomous region to which the recipient of the domestic long-distance incoming traffic belongs upon receiving domestic long-distance incoming traffic; a gateway switching device at the city / state / league level, used to transfer domestic long-distance incoming traffic to the city / state / league level gateway switching device of the operator to which the recipient of the domestic long-distance incoming traffic belongs upon receiving domestic long-distance incoming traffic. In this way, compared with the related technology in which the provincial / autonomous region-level long-distance tandem device first transfers the domestic long-distance input traffic to the city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device transfers the domestic long-distance input traffic to the city / state / league-level gateway switching device, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level gateway switching device, which reduces the transfer process of the city / state / league-level long-distance / local call tandem device, thereby reducing the connection delay and call delay of domestic long-distance input traffic from different operators on both sides of the call, and also saves the transfer ports of the city / state / league-level long-distance / local call tandem device.

[0019] Optionally, the municipal traffic tandem device is further used to, when receiving domestic long-distance outgoing traffic from a user located in the provincial capital / capital city to which the municipal traffic tandem device belongs, or a user roaming to the municipal traffic tandem device, transfer the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem device to which the municipal traffic tandem device belongs; the municipal / state / league-level long-distance / local traffic tandem device is further used to, when receiving domestic long-distance outgoing traffic from a user located in a non-provincial capital / non-capital city to which the municipal / state / league-level long-distance / local traffic tandem device belongs, or a user roaming to the municipal / state / league-level long-distance / local traffic tandem device, transfer the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem device to which the municipal / state / league-level long-distance / local traffic tandem device belongs; the provincial / autonomous region-level long-distance tandem device is further used to, when receiving domestic long-distance outgoing traffic from a user located in a non-provincial capital / non-capital city to which the municipal / state / league-level long-distance / local traffic tandem device belongs, or a user roaming to the municipal / state / league-level long-distance / local traffic tandem device When there is a direct circuit between the long-distance tandem device and the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the domestic long-distance outgoing traffic belongs, the domestic long-distance outgoing traffic is transferred to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the domestic long-distance outgoing traffic belongs; the provincial / autonomous region-level long-distance tandem device is further used to, upon receiving domestic long-distance outgoing traffic and there is no direct circuit between the provincial / autonomous region-level long-distance tandem device and the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the domestic long-distance outgoing traffic belongs, transfer the domestic long-distance outgoing traffic to the regional long-distance tandem device of the region to which the recipient of the domestic long-distance outgoing traffic belongs; the regional long-distance tandem device is further used to, upon receiving domestic long-distance outgoing traffic, transfer the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the domestic long-distance outgoing traffic belongs. In this way, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level long-distance / local telephone tandem device. When transferring domestic long-distance output traffic, the city / state / league-level long-distance / local telephone tandem device can directly transfer the domestic long-distance output traffic to the corresponding provincial / autonomous region-level long-distance tandem device, and then the provincial / autonomous region-level long-distance tandem device can transfer the domestic long-distance output traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the domestic long-distance output traffic belongs, or to the regional long-distance tandem device of the region to which the recipient of the domestic long-distance output traffic belongs, thereby meeting the user's demand for domestic long-distance output traffic.

[0020] Optionally, the provincial / autonomous region-level long-distance tandem device is further used to, when receiving a first long-distance call and the recipient of the first long-distance call belongs to the provincial capital / capital of the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the first long-distance call to the municipal-level call tandem device to which the recipient of the first long-distance call belongs; the municipal-level call tandem device is further used to, when receiving the first long-distance call, transfer the first long-distance call to the recipient of the first long-distance call; the provincial / autonomous region-level long-distance tandem device is further used to, when receiving the first long-distance call and the recipient of the first long-distance call belongs to a non-provincial capital / non-capital of the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, transfer the first long-distance call to the city / state / league-level long-distance / city call tandem device to which the recipient of the first long-distance call belongs; The call tandem device is further used to transfer the first long-distance call to the recipient of the first long-distance call when receiving the first long-distance call; wherein the first long-distance call is a long-distance call within the province / autonomous region dialed by a user located in the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, or a user roaming to the provincial / autonomous region-level long-distance tandem device; the operator to which the recipient of the first long-distance call belongs is the same as the operator to which the provincial / autonomous region-level long-distance tandem device belongs; when the dialing party of the first long-distance call belongs to the provincial capital / capital, the first long-distance call is transferred by the municipal-level call tandem device of the provincial capital / capital to the provincial / autonomous region-level long-distance tandem device; when the dialing party of the first long-distance call belongs to a non-provincial capital / non-capital, the first long-distance call is transferred by the municipal / state / league-level long-distance / city call tandem device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance tandem device. In this way, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level long-distance / local call tandem device. When transferring provincial long-distance calls, if the operator to which the recipient of the provincial long-distance call belongs is also the first operator, the provincial / autonomous region-level long-distance tandem device can directly transfer the provincial long-distance call to the corresponding city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device will transfer the call to the recipient of the call, thereby meeting the user's needs for provincial long-distance input calls and provincial long-distance output calls.

[0021] Optionally, the communication system further includes a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and the province / autonomous region-level long-distance tandem device is connected to a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities in the province / autonomous region where the province / autonomous region-level long-distance tandem device is located; the province / autonomous region-level long-distance tandem device is further used to, when receiving a second long-distance call and the recipient of the second long-distance call belongs to a non-provincial capital / non-capital city / state / league-level gateway switching device to which the recipient of the second long-distance call belongs to a non-provincial capital / non-capital city / state / league-level gateway switching device; the city / state / league-level gateway switching device is used to, when receiving the second long-distance call, transfer the second long-distance call to the recipient of the second long-distance call The second long-distance traffic is the long-distance traffic within the province / autonomous region dialed by the user located in the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, or the user roaming to the provincial / autonomous region-level long-distance tandem device, and the operator to which the recipient of the second long-distance traffic belongs is different from the operator to which the provincial / autonomous region-level long-distance tandem device belongs; when the dialing party of the second long-distance traffic belongs to the provincial capital / capital, the second long-distance traffic is transferred by the municipal traffic tandem device of the provincial capital / capital to the provincial / autonomous region-level long-distance tandem device; when the dialing party of the second long-distance traffic belongs to a non-provincial capital / non-capital, the second long-distance traffic is transferred by the municipal / state / league-level long-distance / city traffic tandem device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance tandem device. In this way, compared with the transfer method in the related technology in which the provincial / autonomous region-level long-distance tandem device first transfers the provincial long-distance traffic to the city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device transfers the provincial long-distance traffic to the city / state / league-level gateway switching device, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level gateway switching device, which reduces the transfer process of the city / state / league-level long-distance / local call tandem device, and thus reduces the connection delay and call delay of the provincial long-distance traffic that belongs to different operators, and also saves the transfer ports of the city / state / league-level long-distance / local call tandem device.

[0022] Optionally, the communication system further comprises: a gateway switching device within the province / autonomous region, the gateway switching device within the province / autonomous region being connected to a city-level traffic tandem device of the provincial capital / capital to which the gateway switching device within the province / autonomous region belongs, and a plurality of city / state / league-level long-distance / local call tandem devices of non-provincial capital / non-capital cities / states / leagues in the province / autonomous region to which the gateway switching device within the province / autonomous region belongs; the city / state / league-level long-distance / local call tandem device is further used to, upon receiving a third long-distance call, transfer the third long-distance call to the gateway switching device within the province / autonomous region to which the city / state / league-level long-distance / local call tandem device belongs in the province / autonomous region; the provincial / autonomous region intranet The gateway switching device is used to transfer the third long-distance traffic to the provincial / autonomous region gateway switching device of the operator to which the third long-distance traffic belongs when receiving the third long-distance traffic; wherein the third long-distance traffic is the provincial / autonomous region long-distance traffic dialed by a user located in the city / state / league to which the city / state / league-level long-distance / local call tandem device belongs, or a user roaming to the city / state / league-level long-distance / local call tandem device; the recipient of the third long-distance traffic belongs to the provincial capital / capital of the province / autonomous region where the gateway switching device is located; the operator to which the dialer of the third long-distance traffic belongs is different from the operator to which the recipient of the third long-distance traffic belongs. In this way, the gateway switching device within the province / autonomous region is connected to the city / state / league-level long-distance / local call tandem device. When the outgoing party of the long-distance call within the province / autonomous region belongs to a non-provincial capital / non-capital city of the province / autonomous region, the receiving party of the long-distance call within the province / autonomous region belongs to the provincial capital / capital city of the province / autonomous region, and the operator to which the receiving party of the long-distance call within the province / autonomous region belongs is different from the operator to which the outgoing party of the long-distance call within the province / autonomous region belongs, the city / state / league-level long-distance / local call tandem device can directly transfer the long-distance call within the province / autonomous region to the gateway switching device within the province / autonomous region without the need for transfer through the provincial / autonomous region-level long-distance tandem device, thereby saving some transfer ports of the provincial / autonomous region-level long-distance tandem device, and at the same time reducing the delay in the transfer process of such long-distance call within the province / autonomous region, thereby improving the user experience.

[0023] Optionally, the communication system further comprises: a gateway switching device within the province / autonomous region belonging to the provincial capital / capital, the gateway switching device within the province / autonomous region being connected to a municipal traffic tandem center belonging to the provincial capital / capital, and a plurality of city / state / league-level long-distance / local call tandem devices in the province / autonomous region to which the gateway switching device within the province / autonomous region belongs that are not provincial capitals / non-capitals; the gateway switching device within the province / autonomous region is further used to, when receiving inter-network input traffic, transfer the inter-network input traffic to the municipal traffic tandem device of the provincial capital / capital to which the recipient of the inter-network input traffic belongs, or transfer the inter-network input traffic to the receiving end of the inter-network input traffic. The recipient belongs to the city / state / league-level long-distance / local call tandem device that is not a provincial capital / non-capital city. The operator to which the dialer of the inter-network input traffic belongs is different from the operator to which the gateway switching device within the province / autonomous region belongs, and the operator to which the recipient of the inter-network input traffic belongs is the same as the operator to which the gateway switching device within the province / autonomous region belongs; the city-level traffic tandem device is also used to transfer the inter-network input traffic to the recipient of the inter-network input traffic when it receives the inter-network input traffic; the city / state / league-level long-distance / local call tandem device is also used to transfer the inter-network input traffic to the recipient of the inter-network input traffic when it receives the inter-network input traffic. In this way, by only setting up a provincial / autonomous region gateway switching device in the communication system, the provincial / autonomous region gateway switching device transfers the inter-network traffic to the city-level traffic tandem device or the city / state / league-level long-distance / local traffic tandem device to which the recipient of the inter-network traffic belongs, and the provincial / autonomous region gateway switching device transfers the inter-network traffic to the provincial / autonomous region gateway switching device of the operator to which the recipient of the inter-network traffic belongs, there is no need to set up a city / state / league-level gateway switching device in non-provincial capitals / non-capital cities, thereby reducing the investment in new IMS city / state / league-level gateway switching devices in cities, states or leagues other than provincial capitals and capital cities.

[0024] Optionally, the city-level traffic tandem device is further used to transfer the inter-network output traffic to the gateway switching device in the province / autonomous region to which the city-level traffic tandem device belongs, when receiving inter-network output traffic dialed by users located in the provincial capital / capital to which the city-level traffic tandem device belongs, or users roaming to the city-level traffic tandem device; the city / state / league-level long-distance / local call tandem device is further used to transfer the inter-network output traffic to the city / state / league-level long-distance / local call tandem device, when receiving inter-network output traffic dialed by users located in non-provincial capital / non-capital to which the city / state / league-level long-distance / local call tandem device belongs, or users roaming to the city / state / league-level long-distance / local call tandem device. a gateway switching device within the province / autonomous region to which the transit / local call tandem device belongs; the gateway switching device within the province / autonomous region is further configured to, upon receiving inter-network output traffic, transfer the inter-network output traffic to the gateway switching device within the province / autonomous region of the operator to which the recipient of the inter-network output traffic belongs; wherein, the operator to which the outgoing party of the inter-network output traffic belongs is the same as the operator to which the gateway switching device within the province / autonomous region belongs, the operator to which the recipient of the inter-network output traffic belongs is different from the operator to which the gateway switching device within the province / autonomous region belongs, and the province / autonomous region to which the outgoing party of the inter-network output traffic belongs is the same as the province / autonomous region to which the recipient of the inter-network output traffic belongs. In this way, by only setting up a provincial / autonomous region gateway switching device in the communication system, the provincial / autonomous region gateway switching device transfers the inter-network traffic to the city-level traffic tandem device or the city / state / league-level long-distance / local traffic tandem device to which the recipient of the inter-network traffic belongs, and the provincial / autonomous region gateway switching device transfers the inter-network traffic to the provincial / autonomous region gateway switching device of the operator to which the recipient of the inter-network traffic belongs, there is no need to set up a city / state / league-level gateway switching device in non-provincial capitals / non-capital cities, thereby reducing the investment in new IMS city / state / league-level gateway switching devices in cities, states or leagues other than provincial capitals and capital cities.

[0025] Optionally, the communication system also includes: a provincial / autonomous region gateway switching device, a municipal traffic tandem device and a provincial / autonomous region long-distance tandem device set up in a sub-center city within the province / autonomous region; wherein, the traffic within the province / autonomous region is taken over by the provincial / autonomous region gateway switching device, the municipal traffic tandem device and the provincial / autonomous region long-distance tandem device in the provincial capital / capital of the province / autonomous region, and the provincial / autonomous region gateway switching device, the municipal traffic tandem device and the provincial / autonomous region long-distance tandem device in the sub-center city serve as backup devices; or, the provincial / autonomous region gateway switching device, the municipal traffic tandem device and the provincial / autonomous region long-distance tandem device in the provincial capital / capital of the province / autonomous region and the provincial / autonomous region gateway switching device, the municipal traffic tandem device and the provincial / autonomous region long-distance tandem device in the sub-center city all bear the traffic within the province / autonomous region. In this way, when the network in a provincial capital or a capital city is paralyzed, the provincial / autonomous region-level long-distance tandem devices and provincial / autonomous region gateway switching devices installed in the sub-center city can still handle the calls within the province or autonomous region without affecting the call forwarding in the province or autonomous region.

[0026] In the specific implementation of this application, the names of the components of the above-mentioned device do not limit the device itself. In actual implementation, these components may appear with other names. As long as the functions of each component are similar to the specific implementation of this application, they are within the scope of the claims of this application and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a tandem layout for international communications of a domestic operator in a related technology provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0029] Figure 3 A communication scenario provided in this application embodiment Figure 1 ;

[0030] Figure 4 A communication scenario provided in this application embodiment Figure 2 ;

[0031] Figure 5 A communication scenario provided in this application embodiment Figure 3 ;

[0032] Figure 6 A communication scenario provided in this application embodiment Figure 4 ;

[0033] Figure 7 A communication scenario provided in this application embodiment Figure 5;

[0034] Figure 8 A communication scenario provided in this application embodiment Figure 6 ;

[0035] Figure 9 A communication scenario provided in this application embodiment Figure 7 ;

[0036] Figure 10 A schematic diagram of the structure of another communication system provided in an embodiment of the present application;

[0037] Figure 11 A structural diagram of another communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connect" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "connected" used in this application have the meaning of conducting electricity. The specific meanings need to be understood in the context.

[0041] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0042] At present, the international communication connection layout of domestic operators is as follows: Figure 1As shown, an international gateway exchange receives incoming international traffic and transfers it to a regional toll tandem. The regional toll tandem then transfers the incoming international traffic to the provincial / autonomous region-level toll tandem to which the international traffic belongs. The provincial / autonomous region-level toll tandem then transfers it to the municipal-level traffic tandem in the provincial capital or the municipal / state / league-level toll / city tandem in non-provincial capitals / non-capital cities. Traffic from other carriers is routed through the provincial / autonomous region-level gateway exchange in the provincial capital or the municipal / state / league-level gateway exchange in non-provincial capitals / non-capital cities. Alternatively, the regional toll tandem transfers the incoming international traffic to the municipal-level traffic tandem in the location of the regional toll tandem. Traffic from other carriers in the location of the regional toll tandem is routed through the municipal-level gateway exchange in the location of the regional toll tandem. Consequently, international outgoing traffic from domestic countries to foreign countries also undergoes these steps, resulting in frequent transfers, long connection and call delays, and poor user experience.

[0043] In response to the above-mentioned problems, an embodiment of the present application provides a communication system in which an international gateway switching device is directly connected to a provincial / autonomous region-level long-distance tandem device. When receiving international incoming traffic, the international gateway switching device can directly transfer the international incoming traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the recipient of the international incoming traffic belongs. Alternatively, when receiving international outgoing traffic, the provincial / autonomous region-level long-distance tandem device transfers the international outgoing traffic directly to the international gateway switching device. In this way, compared to the related art of transferring international incoming traffic and international outgoing traffic via a regional long-distance tandem device, the communication system provided by the present application can reduce the delay in the international traffic transfer process, provide a better user experience, and also save transfer ports of the regional long-distance tandem device.

[0044] Figure 2 This is a schematic diagram of the structure of a communication system provided in some embodiments of the present application. Figure 2 As shown, the communication system may include an international gateway switching device, multiple regional long-distance tandem devices, multiple provincial / autonomous region-level long-distance tandem devices, multiple municipal-level traffic tandem devices belonging to provincial capitals / capitals, multiple municipal / state / league-level long-distance / local traffic tandem devices belonging to non-provincial capitals / non-capitals, multiple provincial / autonomous region-wide gateway switching devices belonging to provincial capitals / capitals, municipal-level gateway switching devices belonging to the location of the regional long-distance tandem devices, and multiple municipal / state / league-level gateway switching devices belonging to non-provincial capitals / non-capitals.

[0045] Among them, the international gateway switching device is connected to multiple regional long-distance tandem devices and multiple provincial / autonomous region-level long-distance tandem devices respectively. The provincial / autonomous region-level long-distance tandem devices are connected to the regional long-distance tandem device to which the provincial / autonomous region-level long-distance tandem device belongs, other provincial / autonomous region-level long-distance tandem devices with direct circuits, the city-level traffic tandem device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, and multiple city / state / league-level long-distance / local traffic tandem devices belonging to non-provincial capital / non-capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located. Multiple regional long-distance tandem devices are interconnected, connected to the municipal traffic tandem device where the regional long-distance tandem device is located, and connected to the provincial / autonomous region-level long-distance tandem device and the provincial / autonomous region-level gateway switching device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, as well as multiple city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities in the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located. The regional long-distance tandem device is connected to the municipal gateway switching device where the regional long-distance tandem device is located. Each device in the above-mentioned communication system belongs to the first operator.

[0046] Optionally, the communication system may include multiple international gateway switches, with different international gateway switches corresponding to different regional toll tandems and provincial / autonomous region toll tandems, routing international traffic from different regions. For example, the communication system includes international gateway switches 1 and 2. International gateway switch 1 is responsible for routing international traffic from Provinces A, B, and C in Region 3, while international gateway switch 2 is responsible for routing international traffic from Provinces D, E, and F in Region 4.

[0047] In some embodiments, a provincial / autonomous region-level toll tandem device is installed in a provincial capital city within a province or a capital city within an autonomous region, and is used to facilitate toll traffic entering and leaving the province / autonomous region. A city / state / league-level toll / city tandem device is installed in a non-provincial capital / non-capital city within a province / autonomous region, that is, within a city / state / league within a province / autonomous region other than the provincial capital / capital city, and is used to facilitate toll traffic entering and leaving the city / state / league.

[0048] For example, user A, whose mobile phone number belongs to city A, calls user B. The city / state / league-level long-distance / local call tandem device in city A receives the call from user A and transfers it to user B.

[0049] In actual communication system deployment, the city / state / league-level long-distance / local call tandem device can be composed of two devices: the city / state / league-level long-distance tandem device and the city / state / league-level traffic tandem device. Since the traffic within cities / states / leagues that are not provincial capitals / capital cities is relatively less than the traffic within the province / autonomous region, the city / state / league-level long-distance tandem device and the city / state / league-level traffic tandem device are often integrated together to form the city / state / league-level long-distance / local call tandem device, with the city / state / league-level long-distance / local call tandem device handling both local and long-distance traffic. Since the provincial / autonomous region-level long-distance tandem device needs to transfer international, domestic, and intra-province / autonomous region long-distance traffic, and thus carries a large amount of traffic, the provincial / autonomous region-level long-distance tandem device and the city-level traffic tandem device are not integrated in provincial capitals or capital cities. The provincial / autonomous region-level long-distance tandem device handles the long-distance traffic within the province / autonomous region, while the city-level traffic tandem device handles the local traffic within the provincial capital / capital city. For example, in a city / state / league that is not a provincial capital / non-capital city, the city / state / league-level long-distance / local call switching device can directly transfer the call to the recipient of the call. In a provincial capital / capital city, when the provincial / autonomous region-level long-distance switching device receives call traffic whose recipient belongs to the provincial capital / capital city, it needs to transfer it to the city-level call switching device of the provincial capital / capital city, and then the city-level call switching device of the provincial capital / capital city transfers it to the recipient of the call.

[0050] In some embodiments, municipal-level traffic tandem devices are installed in the locations of municipalities and regional long-distance tandem devices, provincial capitals, and capital cities. Municipal-level gateway switches are installed in the locations of municipalities and regional long-distance tandem devices to facilitate incoming and outgoing traffic. International gateway switches are also connected to the municipal-level traffic tandem devices in municipalities to facilitate incoming and outgoing international traffic within the municipality.

[0051] In some embodiments, the international gateway switching device is configured to receive international incoming traffic transferred by international gateway switching devices in other countries and forward the international incoming traffic to a provincial / autonomous region-level toll tandem device in the province / autonomous region to which the recipient of the international incoming traffic belongs, or to forward the international incoming traffic to a regional toll tandem device in the region to which the recipient of the international incoming traffic belongs. If the carrier to which the recipient of the international incoming traffic belongs is the first carrier, the provincial / autonomous region-level toll tandem device in the province / autonomous region to which the recipient of the international incoming traffic belongs receives the international incoming traffic and, if the recipient of the international incoming traffic belongs to a provincial capital, forwards the international incoming traffic to a municipal traffic tandem device in the provincial capital. Alternatively, the provincial / autonomous region-level toll tandem device in the province / autonomous region to which the recipient of the international incoming traffic belongs receives the international incoming traffic and, if the recipient of the international incoming traffic belongs to a non-provincial capital / non-capital region, forwards the international incoming traffic to a municipal / state / league-level toll / local traffic tandem device in the provincial capital. When a regional toll tandem receives international incoming traffic, it forwards it to the municipal traffic tandem located in the region where the regional toll tandem belongs to. Furthermore, when a municipal toll tandem receives international incoming traffic, it forwards it to the recipient. When a city / state / league-level toll / local tandem receives international incoming traffic, it forwards it to the recipient.

[0052] For example, suppose user A, whose mobile phone number belongs to country A, calls user B, whose mobile phone number belongs to city D, which is not the provincial capital of province C, country B. This call is considered international inbound traffic for country B. Both user A's and user B's mobile phone numbers belong to the first operator. Figure 3 As shown in the direction indicated by the solid arrow in the figure, the international gateway switching device in country A transfers the call to the international gateway switching device in country B, which then transfers the call to the provincial / autonomous region-level long-distance tandem device in province C. The provincial / autonomous region-level long-distance tandem device in province C then transfers the call to the city / state / league-level long-distance / local call tandem device in city D. Finally, the city / state / league-level long-distance / local call tandem device in city D transfers the call to the terminal equipment used by user B, completing the call connection and making process.

[0053] As another example, if user A, whose mobile phone number belongs to Country A, calls user C, whose mobile phone number belongs to City E, the capital of Province C in Country B, and both user A's and C's mobile numbers belong to the first carrier, Country A's international gateway exchange will forward the call to Country B's international gateway exchange. Country B's international gateway exchange will then forward the call to the provincial / autonomous region-level long-distance tandem in Province C. The provincial / autonomous region-level long-distance tandem in Province C will then forward the call to the municipal tandem in City E. Finally, the municipal tandem in City E will forward the call to the terminal used by user C, completing the call connection process.

[0054] As another example, if user A, whose mobile phone number belongs to Country A, calls user D, whose mobile phone number belongs to City G, in Country B, where a regional long-distance tandem F is located, both user A's and user D's mobile numbers belong to the first carrier. Country A's international gateway switch forwards the call to Country B's international gateway switch, which in turn forwards the call to regional long-distance tandem F. Regional long-distance tandem F then forwards the call to the municipal tandem in City G. Finally, the municipal tandem in City G forwards the call to user D's terminal, completing the call.

[0055] In this way, when transferring international incoming calls, the international gateway switching device is directly connected to the provincial / autonomous region-level long-distance tandem device, and there is no need to transfer all international incoming calls through the regional long-distance tandem device as in the related art. This not only saves the transfer ports of the regional long-distance tandem device, but also reduces the delay in the international call transfer process, which can improve the user experience.

[0056] In some embodiments, when the carrier to which the recipient of the international incoming traffic belongs is different from the first carrier, the provincial / autonomous region-level long distance tandem device, after receiving the international incoming traffic, transfers the international incoming traffic to a city / state / league-level gateway switching device in a non-provincial capital / non-capital city to which the recipient of the international incoming traffic belongs. The city / state / league-level gateway switching device then transfers the international incoming traffic to a city / state / league-level gateway switching device of the carrier to which the recipient of the international incoming traffic belongs. Alternatively, the provincial / autonomous region-level long distance tandem device, after receiving the international incoming traffic, transfers the international incoming traffic to an intra-province / autonomous region gateway switching device in a provincial capital / capital city to which the recipient of the international incoming traffic belongs. The intra-province gateway switching device then transfers the international incoming traffic to an intra-province / autonomous region gateway switching device of the carrier to which the recipient of the international incoming traffic belongs. When a regional long distance tandem receives international incoming traffic and the carrier to which the recipient of the international incoming traffic belongs is different from the carrier to which the regional long distance tandem belongs, the regional long distance tandem will forward the international incoming traffic to the municipal gateway switching device located in the region to which the recipient of the international incoming traffic belongs. Furthermore, when the municipal gateway switching device receives international incoming traffic, it will forward the traffic to the municipal gateway switching device of the carrier to which the recipient of the international incoming traffic belongs.

[0057] In actual application, international input traffic in different regions may be undertaken by different operators. Therefore, when the operator to which the recipient of the international input traffic belongs is different from the operator that receives the international input traffic, the international input traffic needs to be transferred to a city / state / alliance-level gateway switching device, and then the city / state / alliance-level gateway switching device transfers the international input traffic to a city / state / alliance-level gateway switching device provided by the operator to which the recipient of the international input traffic belongs.

[0058] For example, suppose user A, whose mobile phone number belongs to country A, calls user B, whose mobile phone number belongs to city D, which is not the provincial capital of province C, country B. This call is considered international inbound traffic for country B. User B's mobile phone number belongs to the second operator, but the international inbound traffic for province C is handled by the first operator. Figure 4As indicated by the arrows, the international gateway switching device in Country A transfers the call to the international gateway switching device in Country B. The international gateway switching device in Country B then transfers the call to the provincial / autonomous region-level long-distance tandem in Province C. The provincial / autonomous region-level long-distance tandem in Province C then transfers the call to the city / state / league-level gateway switching device in City D. The city / state / league-level gateway switching device in City D then transfers the call to the city / state / league-level gateway switching device in City D belonging to the second carrier. The city / state / league-level gateway switching device in City D then transfers the call to the city / state / league-level long-distance / local tandem in City D belonging to the second carrier. Finally, the city / state / league-level long-distance / local tandem in City D, belonging to the second carrier, transfers the call to the terminal device used by User B, completing the call connection and dialing process.

[0059] As another example, suppose user A, whose mobile number belongs to Country A, calls user C, whose mobile number belongs to City E, the capital of Province C in Country B. This call is considered international inbound traffic for Country B. User C's mobile number belongs to the second carrier, but Province C's international inbound traffic is handled by the first carrier. Country A's international gateway switch forwards the call to Country B's international gateway switch, which in turn forwards the call to the provincial / autonomous region-level long-distance tandem in Province C. The provincial / autonomous region-level long-distance tandem in Province C then forwards the call to the intra-provincial / autonomous region-level gateway switch in City E. Furthermore, the provincial / autonomous region gateway switching device in City E transfers the call to the provincial / autonomous region gateway switching device in City E belonging to the second operator, which in turn transfers the call to the municipal-level call tandem device in City E belonging to the second operator. Finally, the municipal-level call tandem device in City E belonging to the second operator transfers the call to the terminal equipment used by user C, completing the call connection process.

[0060] As another example, if user A, whose mobile phone number belongs to Country A, calls user D, whose mobile phone number belongs to City G, located in Country B, where a regional long-distance tandem F is located, and both user D's mobile phone numbers belong to a second carrier, Country A's international gateway switch will forward the call to Country B's international gateway switch, which will then forward the call to regional long-distance tandem F. Regional long-distance tandem F will then forward the call to the municipal gateway switch in City G. Finally, the municipal gateway switch in City G will forward the call to the municipal gateway switch in City G, which belongs to the second carrier. The municipal gateway switch in City G will then forward the call to the municipal traffic tandem in City G, which belongs to the second carrier. The municipal traffic tandem in City G, which belongs to the second carrier, will then forward the call to the terminal used by user D, completing the call process.

[0061] In this way, compared to the related art method of first transferring international incoming traffic through a provincial / autonomous region-level toll tandem to a city / state / league-level toll / local tandem, which then transfers the international incoming traffic to a city / state / league-level gateway switch, the provincial / autonomous region-level toll tandem is directly connected to the city / state / league-level gateway switch, reducing the transfer process at the city / state / league-level toll / local tandem. When the recipient of international incoming traffic belongs to the location of a regional toll tandem, the regional toll tandem directly transfers the international incoming traffic to the city-level gateway switch at the location of the regional toll tandem, eliminating the need for transfer through the city-level traffic tandem at the location of the regional toll tandem. This reduces the connection delay and call delay for international incoming traffic from different carriers, and also saves transfer ports between the city / state / league-level toll / local tandem and the city-level traffic tandem at the location of the regional toll tandem.

[0062] In some embodiments, when a city-level traffic tandem device receives international outbound traffic from a user located in the provincial capital / capital city to which the city-level traffic tandem device belongs, or a user roaming to the city-level traffic tandem device, the city-level traffic tandem device forwards the international outbound traffic to the provincial / autonomous region-level long distance tandem device in the province / autonomous region to which the city-level traffic tandem device belongs, or to the regional long distance tandem device to which the city-level traffic tandem device belongs. When a city / state / league-level long distance / local call tandem device receives international outbound traffic from a user located in a non-provincial capital / non-capital city to which the city / state / league-level long distance / local call tandem device belongs, or a user roaming to the city / state / league-level long distance / local call tandem device, the city / state / league-level long distance / local call tandem device forwards the international outbound traffic to the provincial / autonomous region-level long distance tandem device in the province / autonomous region to which the city / state / league-level long distance / local call tandem device belongs. Furthermore, after receiving the international outbound traffic, the provincial / autonomous region-level long distance tandem device forwards the international outbound traffic to an international gateway switching device. When receiving international outbound traffic, the regional toll tandem device transfers the traffic to the international gateway switching device. Finally, the international gateway switching device transfers the traffic to the international gateway switching device in the country of the recipient of the traffic.

[0063] For example, suppose user B, whose mobile phone number belongs to city D, which is not the provincial capital of province C in country B, calls user A, whose mobile phone number belongs to country A. This call is considered international outbound traffic for country B. Figure 3 As indicated by the dotted arrow in the figure, the city / state / league-level long-distance / local tandem equipment in City D receives the international outbound call from User B and transfers it to the provincial / autonomous region-level long-distance tandem equipment in Province C. The provincial / autonomous region-level long-distance tandem equipment in Province C then transfers it to the international gateway exchange in Country B. Finally, the international gateway exchange in Country B transfers it to the international gateway exchange in Country A. The international outbound call continues to flow through Country A's communications system before ultimately being transferred to User A's terminal device, completing the international outbound call connection process.

[0064] In another example, user C, whose mobile phone number belongs to City E, the capital of Province C in Country B, calls user A, whose mobile phone number belongs to Country A. This call is considered international outbound traffic for Country B. The city-level traffic tandem in City E receives the international outbound call from user C and transfers it to the provincial / autonomous region-level long-distance tandem in Province C. The provincial / autonomous region-level long-distance tandem in Province C then transfers it to the international gateway switching device in Country B. Finally, the international gateway switching device in Country B transfers the international outbound call to the international gateway switching device in Country A. The international outbound call continues to flow through Country A's communication system before being transferred to the terminal device used by user A, completing the international outbound call process.

[0065] In another example, user D, whose mobile phone number belongs to City G, where a regional long-distance tandem F is located in Country B, calls user A, whose mobile phone number belongs to Country A. This call is considered international outbound traffic for Country B. The municipal traffic tandem in City G receives the international outbound call from user D and transfers it to regional long-distance tandem F. Regional long-distance tandem F then transfers the call to the international gateway exchange in Country B. Finally, the international gateway exchange in Country B transfers the international outbound call to the international gateway exchange in Country A. The international outbound call continues to flow through Country A's communications system before being transferred to the terminal device used by user A, completing the international outbound call process.

[0066] In this way, when transferring international outbound calls, the international gateway switching device is directly connected to the provincial / autonomous region-level long-distance tandem device, and there is no need to transfer all international outbound and inbound calls through the regional long-distance tandem device as in the related art. This not only saves the transfer ports of the regional long-distance tandem device, but also reduces the delay in the international call transfer process, which can improve the user experience.

[0067] In some embodiments, when a provincial / autonomous region-level long-distance tandem device receives domestic long-distance input traffic and the operator to which the recipient of the domestic long-distance input traffic belongs is the first operator, the provincial / autonomous region-level long-distance tandem device transfers the domestic long-distance input traffic to a municipal-level traffic tandem device in the provincial capital / capital city of the province / autonomous region to which the recipient of the domestic long-distance input traffic belongs, or transfers the domestic long-distance input traffic to a municipal / state / league-level long-distance / local traffic tandem device in a non-provincial capital / non-capital city of the province / autonomous region to which the recipient of the domestic long-distance input traffic belongs. Finally, the municipal-level traffic tandem device or the municipal / state / league-level long-distance / local traffic tandem device, upon receiving the domestic long-distance input traffic, transfers the domestic long-distance input traffic to the recipient of the domestic long-distance input traffic.

[0068] In some embodiments, when a municipal traffic tandem device receives domestic long-distance outgoing traffic from a user located in the provincial capital / capital city to which the municipal traffic tandem device belongs, or a user roaming to the municipal traffic tandem device, the municipal traffic tandem device transfers the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the municipal traffic tandem device belongs; when a municipal / state / league-level long-distance / local traffic tandem device receives domestic long-distance outgoing traffic from a user located in a non-provincial capital / non-capital city to which the municipal / state / league-level long-distance / local traffic tandem device belongs, or a user roaming to the municipal / state / league-level long-distance / local traffic tandem device, the municipal / state / league-level long-distance / local traffic tandem device transfers the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem device of the province / autonomous region to which the municipal / state / league-level long-distance / local traffic tandem device belongs. When a provincial / autonomous region-level toll tandem device receives domestic outgoing long-distance traffic and there is a direct circuit between the provincial / autonomous region-level toll tandem device and the provincial / autonomous region-level toll tandem device of the province / autonomous region to which the recipient of the domestic outgoing long-distance traffic belongs, it shall transfer the domestic outgoing long-distance traffic to the provincial / autonomous region-level toll tandem device of the province / autonomous region to which the recipient of the domestic outgoing long-distance traffic belongs. When a provincial / autonomous region-level toll tandem device receives domestic outgoing long-distance traffic and there is no direct circuit between the provincial / autonomous region-level toll tandem device and the provincial / autonomous region-level toll tandem device of the province / autonomous region to which the recipient of the domestic outgoing long-distance traffic belongs, it shall transfer the domestic outgoing long-distance traffic to the regional toll tandem device of the region to which the recipient of the domestic outgoing long-distance traffic belongs. When a regional toll tandem device receives domestic outgoing long-distance traffic, it shall transfer the domestic outgoing long-distance traffic to the provincial / autonomous region-level toll tandem device of the province / autonomous region to which the recipient of the domestic outgoing long-distance traffic belongs.

[0069] For example, assume that user A, whose mobile phone number belongs to City C, Province A, calls user B, whose mobile phone number belongs to City D, Province B. There is a direct circuit between the provincial / autonomous region-level long-distance tandem device in Province A and the provincial / autonomous region-level long-distance tandem device in Province B. The mobile phone numbers of user A and user B both belong to the first operator. This call is domestic long-distance outbound traffic for Province A and domestic long-distance inbound traffic for Province B. Figure 5As shown in the direction indicated by the solid arrow in , when City C is the provincial capital of Province A, the city-level traffic tandem device of City C receives the traffic dialed by user a (when City C is not the provincial capital of Province A, the city / state / league-level long-distance / city traffic tandem device of City C receives the traffic dialed by user a), transfers the traffic to the provincial / autonomous region-level long-distance tandem device of Province A, and then the provincial / autonomous region-level long-distance tandem device of Province A transfers the traffic to the provincial / autonomous region-level long-distance tandem device of Province B. When D is the capital of Province B, the provincial / autonomous region-level long-distance tandem device of Province B transfers the call to the municipal-level call tandem device of City D, and finally the municipal-level call tandem device of City D transfers the call to the terminal device used by user b (when D is not the provincial capital of Province B, the provincial / autonomous region-level long-distance tandem device of Province B transfers the call to the municipal / state / league-level long-distance / local call tandem device of City D, and then the municipal / state / league-level long-distance / local call tandem device of City D transfers the call to the terminal device used by user b), completing the call connection and call process. When user b calls user a, the call transfer process can be as follows: Figure 5 The dotted arrows indicate the same transfer process and are not described here. When there is no direct circuit between Province A and Province B, Province A's provincial / autonomous region-level long-distance tandem device transfers domestic long-distance outbound traffic to regional long-distance tandem device E in the region to which Province A belongs. If Province B and Province A belong to the same region, regional long-distance tandem device E, upon receiving traffic transferred by Province A's provincial / autonomous region-level long-distance tandem device, transfers the traffic to Province B's provincial / autonomous region-level long-distance tandem device. If Province B belongs to a different region than Province A, regional long-distance tandem device E transfers the traffic to regional long-distance tandem device F in the region to which Province B belongs. Regional long-distance tandem device F then transfers the traffic to Province B's provincial / autonomous region-level long-distance tandem device.

[0070] In this way, the provincial / autonomous region-level long-distance tandem is directly connected to the city / state / league-level long-distance / local call tandem. When transferring domestic long-distance incoming traffic, if the carrier to which the domestic long-distance incoming traffic belongs is also the first carrier, the provincial / autonomous region-level long-distance tandem can directly transfer the domestic long-distance incoming traffic to the corresponding city / state / league-level long-distance / local call tandem, and then transfer it to the recipient of the domestic long-distance incoming traffic. When transferring domestic long-distance outgoing traffic, the city / state / league-level long-distance / local call tandem can directly transfer the domestic long-distance outgoing traffic to the corresponding provincial / autonomous region-level long-distance tandem. The provincial / autonomous region-level long-distance tandem can then transfer the domestic long-distance outgoing traffic to the provincial / autonomous region-level long-distance tandem of the province / autonomous region to which the domestic long-distance outgoing traffic belongs, or to the regional long-distance tandem of the region to which the domestic long-distance outgoing traffic belongs, thus meeting users' needs for domestic long-distance incoming and outgoing traffic.

[0071] In some embodiments, when a provincial / autonomous region-level long distance tandem device receives domestic long distance incoming traffic and the carrier to which the recipient of the domestic long distance incoming traffic belongs is not the first carrier, the provincial / autonomous region-level long distance tandem device transfers the domestic long distance incoming traffic to a provincial / autonomous region-level gateway switching device in the provincial / autonomous region to which the recipient of the domestic long distance incoming traffic belongs, or transfers the domestic long distance incoming traffic to a city / state / league-level gateway switching device in a non-provincial / non-league-level gateway switching device. Furthermore, when the provincial / autonomous region-level gateway switching device receives the domestic long distance incoming traffic, it transfers the domestic long distance incoming traffic to a provincial / autonomous region-level gateway switching device in the carrier to which the recipient of the domestic long distance incoming traffic belongs. Alternatively, when the city / state / league-level gateway switching device receives the domestic long distance incoming traffic, it transfers the domestic long distance incoming traffic to a city / state / league-level gateway switching device in the carrier to which the recipient of the domestic long distance incoming traffic belongs.

[0072] For example, assume that user a, whose mobile phone number belongs to city C in province A, calls user b, whose mobile phone number belongs to city D in province B. User a's mobile phone number belongs to the first operator, and user b's mobile phone number belongs to the second operator. This call is a domestic long-distance outbound call for province A and a domestic long-distance inbound call for province B. Figure 6As shown in the direction of the arrow, City C is not a provincial capital. The city / state / league-level long-distance / city call tandem device of City C receives the call dialed by user a and transfers the call to the province / autonomous region-level long-distance tandem device of Province A (when City C is the provincial capital of Province A, the city-level call tandem device of City C receives the call dialed by user a and transfers the call to the province / autonomous region-level long-distance tandem device of Province A), and then the province / autonomous region-level long-distance tandem device of Province A transfers the call to the province / autonomous region-level long-distance tandem device of Province B (this is the case where there is a direct circuit between Provinces A and B. The call transfer process when there is no direct circuit between Provinces A and B can refer to the above example and will not be repeated here). When City D is not the provincial capital of Province B, the provincial / autonomous region-level long-distance tandem device of Province B will then transfer the call to the city / state / league-level gateway switching device of City D. Finally, the city / state / league-level gateway switching device of City D will transfer the call to the city / state / league-level gateway switching device provided by the second operator in City D. The city / state / league-level gateway switching device provided by the second operator in City D will transfer the call to the city / state / league-level long-distance / local call tandem device provided by the second operator in City D. The city / state / league-level long-distance / local call tandem device provided by the second operator in City D will then transfer the call to the terminal equipment used by user b, completing the call connection and making process. When City D is the capital of Province B, the provincial / autonomous region-level long-distance tandem device of Province B transfers the call to the provincial / autonomous region-wide gateway switching device of City D. Finally, the provincial / autonomous region-wide gateway switching device of City D transfers the call to the provincial / autonomous region-wide gateway switching device provided by the second operator in City D. The provincial / autonomous region-wide gateway switching device provided by the second operator in City D transfers the call to the municipal-level call tandem device provided by the second operator in City D. The municipal-level call tandem device provided by the second operator in City D then transfers the call to the terminal equipment used by user B, completing the call connection and making process.

[0073] In this way, compared with the related art in which the provincial / autonomous region-level long-distance tandem device first transfers the domestic long-distance input traffic to the city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device transfers the domestic long-distance input traffic to the city / state / league-level gateway switching device, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level gateway switching device, which reduces the transfer process of the city / state / league-level long-distance / local call tandem device, thereby reducing the connection delay and call delay of domestic long-distance input traffic from different operators on both sides of the call, and also saves the transfer ports of the city / state / league-level long-distance / local call tandem device.

[0074] In some embodiments, when the provincial / autonomous region-level long-distance tandem device receives the first long-distance traffic and the recipient of the first long-distance traffic belongs to the provincial capital / capital of the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, the provincial / autonomous region-level long-distance tandem device transfers the first long-distance traffic to the municipal-level traffic tandem device to which the recipient of the first long-distance traffic belongs; when the municipal-level traffic tandem device receives the first long-distance traffic, the provincial / autonomous region-level long-distance tandem device transfers the first long-distance traffic to the recipient of the first long-distance traffic; when the provincial / autonomous region-level long-distance tandem device receives the first long-distance traffic and the recipient of the first long-distance traffic belongs to a non-provincial capital / non-capital of the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, the provincial / autonomous region-level long-distance tandem device transfers the first long-distance traffic to the municipal / state / league-level long-distance / city traffic tandem device to which the recipient of the first long-distance traffic belongs; When receiving the first long-distance call, the connection device transfers the first long-distance call to the recipient of the first long-distance call; wherein, the first long-distance call is a long-distance call within the province / autonomous region dialed by a user located in the province / autonomous region to which the provincial / autonomous region-level long-distance connection device belongs, or a user roaming to the provincial / autonomous region-level long-distance connection device; the operator to which the recipient of the first long-distance call belongs is the same as the operator to which the provincial / autonomous region-level long-distance connection device belongs; when the dialing party of the first long-distance call belongs to the provincial capital / capital, the first long-distance call is transferred by the municipal-level call connection device of the provincial capital / capital to the provincial / autonomous region-level long-distance connection device; when the dialing party of the first long-distance call belongs to a non-provincial capital / non-capital, the first long-distance call is transferred by the municipal / state / league-level long-distance / city call connection device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance connection device.

[0075] For example, assume that user a, whose mobile phone number belongs to city B in province A, calls user b, whose mobile phone number belongs to city C in province A. Both user a and user b’s mobile phone numbers belong to the first operator. Figure 7 As shown by the direction of the arrow in , if City B is the capital of Province A and City C is not a provincial capital, the city-level call tandem device in City B receives the call made by user a and transfers the call to the provincial / autonomous region-level long-distance tandem device in Province A. Then the provincial / autonomous region-level long-distance tandem device in Province A transfers the call to the city / state / league-level long-distance / local call tandem device in City C. Then the city / state / league-level long-distance / local call tandem device in City C transfers the call to the terminal equipment used by user b, completing the call connection and dialing process. If City B is a non-provincial capital of Province A, and City C is a non-provincial capital different from City B, then the city / state / league-level long-distance / local call tandem device of City B receives the call made by user a, and transfers the call to the province / autonomous region-level long-distance tandem device of Province A, and then the province / autonomous region-level long-distance tandem device of Province A transfers the call to the city / state / league-level long-distance / local call tandem device of City C, and then the city / state / league-level long-distance / local call tandem device of City C transfers the call to the terminal equipment used by user b, completing the call connection and dialing process.

[0076] In this way, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level long-distance / local call tandem device. When transferring provincial long-distance calls, if the operator to which the recipient of the provincial long-distance call belongs is also the first operator, the provincial / autonomous region-level long-distance tandem device can directly transfer the provincial long-distance call to the corresponding city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device will transfer the call to the recipient of the call, thereby meeting the user's needs for provincial long-distance input and output calls.

[0077] In some embodiments, when a provincial / autonomous region-level long-distance tandem device receives a second long-distance call, and the recipient of the second long-distance call belongs to a non-provincial capital / non-capital city of the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, the second long-distance call is transferred to a city / state / league-level gateway switching device to which the recipient of the second long-distance call belongs to a non-provincial capital / capital city; when the city / state / league-level gateway switching device receives the second long-distance call, the second long-distance call is transferred to a city / state / league-level gateway switching device to which the recipient of the second long-distance call belongs to an operator; wherein the second long-distance call is received by a person located in the province to which the provincial / autonomous region-level long-distance tandem device belongs. For users in a certain province / autonomous region, or users who roam to a provincial / autonomous region-level long-distance tandem device, when they make an intra-province / autonomous region-level long-distance call, the operator to which the recipient of the second long-distance call belongs is different from the operator to which the provincial / autonomous region-level long-distance tandem device belongs; when the outgoing party of the second long-distance call belongs to the provincial capital / capital, the second long-distance call is transferred by the municipal-level call tandem device of the provincial capital / capital to the provincial / autonomous region-level long-distance tandem device; when the outgoing party of the second long-distance call belongs to a non-provincial capital / non-capital, the second long-distance call is transferred by the municipal / state / league-level long-distance / city call tandem device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance tandem device.

[0078] For example, assume that user a, whose mobile phone number belongs to city B in province A, calls user b, whose mobile phone number belongs to city C in province A. User a's mobile phone number belongs to the first operator, and user b's mobile phone number belongs to another operator. Figure 8As shown by the direction of the arrow in , if City B is the capital of Province A and City C is not a provincial capital, the city-level traffic tandem device in City B receives the call made by user a and transfers the call to the provincial / autonomous region-level long-distance tandem device in Province A. Then the provincial / autonomous region-level long-distance tandem device in Province A transfers the call to the city / state / league-level gateway switching device in City C. The city / state / league-level gateway switching device in City C transfers the call to the city / state / league-level long-distance / local call tandem device in City C. Then the city / state / league-level long-distance / local call tandem device in City C transfers the call to the terminal equipment used by user b, completing the call connection and dialing process. If City B is a non-provincial capital of Province A, and City C is a non-provincial capital different from City B, then the city / state / league-level long-distance / local call tandem device of City B receives the call made by user a, and transfers the call to the province / autonomous region-level long-distance tandem device of Province A, and then the province / autonomous region-level long-distance tandem device of Province A transfers the call to the city / state / league-level gateway switching device of City C, and the city / state / league-level gateway switching device of City C transfers the call to the city / state / league-level long-distance / local call tandem device of City C, and then the city / state / league-level long-distance / local call tandem device of City C transfers the call to the terminal equipment used by user b, completing the call connection and dialing process.

[0079] In this way, compared with the transfer method in the related technology in which the provincial / autonomous region-level long-distance tandem device first transfers the provincial long-distance traffic to the city / state / league-level long-distance / local call tandem device, and then the city / state / league-level long-distance / local call tandem device transfers the provincial long-distance traffic to the city / state / league-level gateway switching device, the provincial / autonomous region-level long-distance tandem device is directly connected to the city / state / league-level gateway switching device, which reduces the transfer process of the city / state / league-level long-distance / local call tandem device, and also reduces the connection delay and call delay of the provincial long-distance traffic with different operators, and also saves the transfer ports of the city / state / league-level long-distance / local call tandem device.

[0080] In some embodiments, when a city / state / league-level long-distance / local call tandem device receives a third long-distance call, it transfers the third long-distance call to a gateway switching device within the province / autonomous region of the province / autonomous region to which the city / state / league-level long-distance / local call tandem device belongs; when the gateway switching device within the province / autonomous region receives the third long-distance call, it transfers the third long-distance call to a gateway switching device within the province / autonomous region of the operator to which the third long-distance call belongs; wherein the third long-distance call is an intra-province / autonomous region long-distance call dialed by a user located in the city / state / league to which the city / state / league-level long-distance / local call tandem device belongs, or a user roaming to the city / state / league-level long-distance / local call tandem device; the recipient of the third long-distance call belongs to the provincial capital / capital of the province / autonomous region where the gateway switching device within the province is located; the operator to which the dialer of the third long-distance call belongs is different from the operator to which the recipient of the third long-distance call belongs.

[0081] For example, assume that the capital of Province A is City B, and the gateway switching device within the province / autonomous region of Province A is located in City B. User A, whose mobile phone number belongs to City C, a non-provincial capital of Province A, calls user B, whose mobile phone number belongs to City B, Province A. User A's mobile phone number belongs to the first operator, and user B's mobile phone number belongs to the second operator. Figure 9 As shown in the direction of the arrow, the city / state / league-level long-distance / local call tandem device of the first operator in City C receives the call made by user a, and transfers the call to the province / autonomous region gateway switching device of the first operator in City B. The province / autonomous region gateway switching device of the first operator in City B then transfers the call to the province / autonomous region gateway switching device provided by the second operator in City B. The province / autonomous region gateway switching device provided by the second operator in City B then transfers the call to the city-level call tandem device in City B. The city-level call tandem device in City B then transfers the call to the terminal equipment used by user b, completing the call connection and dialing process.

[0082] In this way, the gateway switching device within the province / autonomous region is connected to the city / state / league-level long-distance / local call tandem device. When the outgoing party of the long-distance call within the province / autonomous region belongs to a non-provincial capital / non-capital city of the province / autonomous region, the receiving party of the long-distance call within the province / autonomous region belongs to the provincial capital / capital city of the province / autonomous region, and the operator to which the receiving party of the long-distance call within the province / autonomous region belongs is different from the operator to which the outgoing party of the long-distance call within the province / autonomous region belongs, the city / state / league-level long-distance / local call tandem device can directly transfer the long-distance call within the province / autonomous region to the gateway switching device within the province / autonomous region without the need for transfer through the provincial / autonomous region-level long-distance tandem device, thereby saving some transfer ports of the provincial / autonomous region-level long-distance tandem device, and at the same time reducing the delay in the transfer process of such long-distance call within the province / autonomous region, thereby improving the user experience.

[0083] In recent years, with the rapid development of communications technology, voice traffic has gradually evolved from traditional circuit-switched bearer methods to IMS (IP Multimedia Subsystem)-based networks. With 5G technology in particular, voice traffic will further evolve to the 5G standard voice solution VoNR (Voice over New Radio). As the core technology of next-generation networks, IMS provides a unified control core, supports multiple fixed and mobile access methods, and can provide service capabilities more flexibly and quickly.

[0084] Since the core network of IMS is authenticated and billed in provincial capitals and capital cities, the structure of the communication system can also be as follows: Figure 10 shown. Figure 10The communication system shown includes an international gateway switching device, multiple regional long-distance switching devices, multiple provincial / autonomous region-level long-distance switching devices, multiple municipal-level traffic switching devices belonging to provincial capitals / capitals, multiple provincial / autonomous region-wide gateway switching devices belonging to provincial capitals / capitals, and multiple municipal / state / league-level long-distance / local traffic switching devices belonging to non-provincial capitals / non-capitals. Among them, the international gateway switching devices are connected to multiple regional toll tandems and multiple provincial / autonomous region-level toll tandems. The provincial / autonomous region-level toll tandems are connected to the regional toll tandem to which the provincial / autonomous region-level toll tandem device belongs, other provincial / autonomous region-level toll tandems with direct circuits, the municipal traffic tandem device belonging to the provincial capital / capital city of the province / autonomous region where the provincial / autonomous region-level toll tandem device is located, and multiple municipal / state / league-level toll / local traffic tandem devices belonging to non-provincial capital / non-capital cities in the province / autonomous region where the provincial / autonomous region-level toll tandem device is located. Multiple regional toll tandems are connected to each other, and the regional toll tandem device is connected to the municipal traffic tandem device where the regional toll tandem device is located. The intra-provincial / autonomous region-level gateway switching devices are connected to the municipal traffic tandem center belonging to the provincial capital / capital city, and multiple municipal / state / league-level toll / local traffic tandem devices belonging to non-provincial capital / non-capital cities in the province / autonomous region where the intra-provincial gateway switching device belongs. All of the above devices belong to the first operator.

[0085] In some embodiments, when a gateway switching device within a province / autonomous region receives inter-network input traffic, it transfers the inter-network input traffic to a municipal traffic tandem device in a provincial capital / capital city where the recipient of the inter-network input traffic belongs, or transfers the inter-network input traffic to a city / state / league-level long-distance / local call tandem device in a non-provincial capital / non-capital city where the recipient of the inter-network input traffic belongs, the operator to which the dialer of the inter-network input traffic belongs is different from the operator to which the gateway switching device within the province / autonomous region belongs, and the operator to which the recipient of the inter-network input traffic belongs is the same as the operator to which the gateway switching device within the province / autonomous region belongs; the municipal traffic tandem device is further used to transfer the inter-network input traffic to the recipient of the inter-network input traffic when receiving the inter-network input traffic; the city / state / league-level long-distance / local call tandem device is further used to transfer the inter-network input traffic to the recipient of the inter-network input traffic when receiving the inter-network input traffic.

[0086] In other embodiments, when the city-level traffic tandem device receives inter-network output traffic dialed by a user located in the provincial capital / capital to which the city-level traffic tandem device belongs, or a user roaming to the city-level traffic tandem device, the inter-network output traffic is transferred to the gateway switching device in the province / autonomous region to which the city-level traffic tandem device belongs; when the city / state / league-level long-distance / local call tandem device receives inter-network output traffic dialed by a user located in a non-provincial capital / non-capital to which the city / state / league-level long-distance / local call tandem device belongs, or a user roaming to the city / state / league-level long-distance / local call tandem device, the inter-network output traffic is transferred to the city / state / league-level long-distance / local call tandem device. The intra-province / autonomous region gateway switching device belongs to the province / autonomous region to which the transit / local call tandem device belongs; when the intra-province / autonomous region gateway switching device receives inter-network output traffic, it transfers the inter-network output traffic to the intra-province / autonomous region gateway switching device of the operator to which the recipient of the inter-network output traffic belongs; wherein, the operator to which the outgoing party of the inter-network output traffic belongs is the same as the operator to which the intra-province / autonomous region gateway switching device belongs, the operator to which the recipient of the inter-network output traffic belongs is different from the operator to which the intra-province / autonomous region gateway switching device belongs, and the province / autonomous region to which the outgoing party of the inter-network output traffic belongs is the same as the province / autonomous region to which the recipient of the inter-network output traffic belongs.

[0087] The above-mentioned inter-network input traffic and inter-network output traffic can be international, domestic or long-distance traffic within a province / autonomous region. The transfer process outside the province is the same as the transfer process of traffic in the above-mentioned embodiment, and will not be repeated here. The following detailed description of the transfer process of inter-network input traffic and inter-network output traffic within a province / autonomous region is given with examples.

[0088] For example, suppose user A, whose mobile phone number belongs to City B in Province A, calls user B, whose mobile phone number belongs to City C in Province A. User A's mobile phone number belongs to the first carrier, while user B's mobile phone number belongs to the second carrier. In this example, City B and City C are both non-provincial capitals. The city / state / league-level long-distance / local call tandem in City B receives the call from user A and transfers it to the intra-provincial / autonomous region gateway switch of the first carrier in Province A. It then transfers it to the intra-provincial / autonomous region gateway switch of the second carrier in Province A. The intra-provincial / autonomous region gateway switch of the second carrier transfers the call to the city / state / league-level long-distance / local call tandem in City C. Finally, the city / state / league-level long-distance / local call tandem in City C transfers the call to the terminal used by user B, completing the call connection process. In another example, City B is the provincial capital and City C is not a provincial capital. The city-level call tandem device in City B receives the call dialed by user a, and transfers the call to the provincial / autonomous region gateway switching device of the first operator in Province A, and then to the provincial / autonomous region gateway switching device of the second operator in Province A. The provincial / autonomous region gateway switching device of the second operator transfers the call to the city / state / league-level long-distance / local call tandem device in City C. Finally, the city / state / league-level long-distance / local call tandem device in City C transfers the call to the terminal equipment used by user b, completing the call connection process.

[0089] For another example, suppose user A, whose mobile number belongs to City B in Province A, calls user B, whose mobile number belongs to City D in Province C. User A's mobile number belongs to the first carrier, while user B's mobile number belongs to the second carrier. Both City B and City D are non-provincial capitals. The city / state / league-level long-distance / local call tandem in City B receives user A's outgoing call and transfers it to the province / autonomous region-level long-distance tandem of the first carrier in Province A. The province / autonomous region-level long-distance tandem of the first carrier in Province A then transfers the call to the province / autonomous region-level long-distance tandem of the first carrier in Province C. Furthermore, the provincial / autonomous region-level long-distance tandem device of the first operator in Province C transfers the call to the provincial / autonomous region-wide gateway switching device of the first operator in Province C, which in turn transfers the call to the provincial / autonomous region-wide gateway switching device of the second operator in Province C, which in turn transfers the call to the municipal / state / league-level long-distance / local call tandem device of City D, and finally, the municipal / state / league-level long-distance / local call tandem device of City D transfers the call to the terminal equipment used by user b, completing the call connection and making process.

[0090] The international transfer process of inter-network input traffic and inter-network output traffic is similar to the above transfer process and will not be repeated here.

[0091] In this way, by only setting up a provincial / autonomous region gateway switching device in the communication system, the provincial / autonomous region gateway switching device transfers the inter-network traffic to the city-level traffic tandem device or the city / state / league-level long-distance / local traffic tandem device to which the recipient of the inter-network traffic belongs, and the provincial / autonomous region gateway switching device transfers the inter-network traffic to the provincial / autonomous region gateway switching device of the operator to which the recipient of the inter-network traffic belongs, there is no need to set up city / state / league-level gateway switching devices in non-provincial capitals / non-capital cities, thereby reducing the investment in new IMS city / state / league-level gateway switching devices in cities, states or leagues other than provincial capitals and capital cities.

[0092] Optional, based on Figure 10 In the communication system shown, provincial capitals and metropolitan areas can be equipped with multiple intra-provincial / autonomous region gateway switches, each of which is connected to multiple city / state / league-level long-distance / local call tandems. For example, if the provincial capital of Province A contains three intra-provincial / autonomous region gateway switches, and Province A includes nine cities / states / leagues, then these three intra-provincial / autonomous region gateway switches can collectively handle the traffic related to the three cities / states / leagues.

[0093] Since all calls between different operators within a province or autonomous region are cleared by the interconnected provincial / autonomous region gateway switching device, Figure 10 The relay port capacity of the gateway switching device within the province / autonomous region in the communication system shown should meet the needs of interconnection and intercommunication traffic.

[0094] Optionally, the relay port of the gateway switching device within the province / autonomous region may be a circuit domain port or an internet domain port. When the relay port of the gateway switching device within the province / autonomous region is a circuit domain port, it may include a circuit domain port with a transfer rate of 2 megabits (M) or 155M. When the relay port of the gateway switching device within the province / autonomous region is an internet domain port, it may include an internet protocol (IP) port with a transfer rate of 100M, GE (gigabit Ethernet), 2.5GE, 10GE, etc.

[0095] In some embodiments, as Figure 11 As shown, based on Figure 10The communication system may also include a provincial / autonomous region gateway switching device, a municipal traffic tandem device, and a provincial / autonomous region long-distance tandem device located in a sub-center city within the province / autonomous region. The provincial / autonomous region's traffic is handled by the provincial / autonomous region gateway switching device, municipal traffic tandem device, and provincial / autonomous region long-distance tandem device in the provincial / autonomous region's capital city, with the provincial / autonomous region gateway switching device, municipal traffic tandem device, and provincial / autonomous region long-distance tandem device in the sub-center city serving as backup devices. Alternatively, the provincial / autonomous region gateway switching device, municipal traffic tandem device, and provincial / autonomous region long-distance tandem device in the provincial / autonomous region's capital city, along with the provincial / autonomous region gateway switching device, municipal traffic tandem device, and provincial / autonomous region long-distance tandem device in the sub-center city, may share the traffic within the province / autonomous region. That is, the provincial / autonomous region's capital city and the sub-center city may handle the province / autonomous region's traffic in a group backup manner, or the provincial / autonomous region's capital city and the sub-center city may handle the province / autonomous region's traffic in a traffic load-sharing manner.

[0096] For example, in Province A, City B is the provincial capital and City C is the secondary central city. Both City B and City C are equipped with provincial / autonomous region-level long-distance tandem equipment and intra-provincial / autonomous region gateway switches. In this case, City B and City C can evenly share the traffic within Province A. Alternatively, City B can handle the traffic within Province A. In the event of an emergency in City B, the provincial / autonomous region-level long-distance tandem equipment and intra-provincial / autonomous region gateway switches in City C can be activated to handle the traffic within Province A. Alternatively, City B can handle a certain percentage of the traffic within Province A, while City C handles the remaining traffic within Province A.

[0097] Since some areas are located in areas where natural disasters such as earthquakes and floods occur frequently, or where wars may break out, or in some vast areas with large populations, it is possible to select a sub-center city from the cities, states or leagues other than the provincial capital or capital city within the province or autonomous region of these areas, and add provincial / autonomous region-level long-distance tandem devices and provincial / autonomous region gateway switching devices in this sub-center city.

[0098] In this way, when the network in a provincial capital city or a capital city is paralyzed due to the above situation, the provincial / autonomous region-level long-distance tandem devices and provincial / autonomous region-wide gateway switching devices installed in the sub-center city can still handle the calls within the province or autonomous region, and will not affect the call forwarding within the province or autonomous region.

[0099] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0100] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

[0101] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A communication system, characterized in that: include: International gateway switching devices, multiple regional long-distance tandem devices, multiple provincial / autonomous region-level long-distance tandem devices, multiple city-level traffic tandem devices belonging to provincial capitals / capitals, and multiple city / state / league-level long-distance / local call tandem devices belonging to non-provincial capitals / non-capitals; The international gateway switching device is respectively connected to a plurality of the large-scale long-distance tandem devices and a plurality of the provincial / autonomous region-level long-distance tandem devices. The provincial / autonomous region-level long-distance tandem devices are respectively connected to the large-scale long-distance tandem device to which the provincial / autonomous region-level long-distance tandem device belongs, other provincial / autonomous region-level long-distance tandem devices with direct circuits, the municipal traffic tandem device belonging to the provincial capital / capital of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, and a plurality of municipal / state / league-level long-distance / local traffic tandem devices belonging to non-provincial capitals / non-capital cities of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located. The plurality of large-scale long-distance tandem devices are connected to each other, and the large-scale long-distance tandem device is connected to the municipal traffic tandem device where the large-scale long-distance tandem device is located. The international gateway switching device is configured to receive international incoming traffic and transfer the international incoming traffic to the provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the international incoming traffic belongs, or to transfer the international incoming traffic to the regional long distance tandem device of the region to which the recipient of the international incoming traffic belongs; The provincial / autonomous region-level long distance tandem device is configured to, upon receiving the international incoming traffic and if the carrier to which the recipient of the international incoming traffic belongs is the same as the carrier to which the provincial / autonomous region-level long distance tandem device belongs, transfer the international incoming traffic to the municipal traffic tandem device in the provincial capital / state capital of the province / autonomous region to which the recipient of the international incoming traffic belongs, or transfer the international incoming traffic to the municipal / state / league-level long distance / local traffic tandem device in a non-provincial capital / non-state capital of the province / autonomous region to which the recipient of the international incoming traffic belongs; The regional long distance tandem device is configured to, upon receiving the international incoming traffic, transfer the international incoming traffic to the municipal traffic tandem device located at the location of the regional long distance tandem device in the region to which the recipient of the international incoming traffic belongs; The city / state / league-level long-distance / local call tandem device is used to transfer the international incoming call traffic to the recipient of the international incoming call traffic upon receiving the international incoming call traffic; The municipal traffic tandem device is configured to transfer the international incoming traffic to a recipient of the international incoming traffic upon receiving the international incoming traffic; The communication system further includes a provincial / autonomous region gateway switching device belonging to a provincial capital, a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and a city-level gateway switching device belonging to the location of the large-scale long-distance tandem device. The provincial / autonomous region-level long-distance tandem device is respectively connected to the provincial / autonomous region gateway switching device belonging to the provincial capital / capital city of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located, and the plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities of the province / autonomous region where the provincial / autonomous region-level long-distance tandem device is located. The large-scale long-distance tandem device is connected to the city-level gateway switching device belonging to the location of the large-scale long-distance tandem device. The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving the international incoming traffic and if the carrier to which the recipient of the international incoming traffic belongs is different from the carrier to which the provincial / autonomous region-level long distance tandem device belongs, transfer the international incoming traffic to the intra-provincial / autonomous region-level gateway switching device of the province / autonomous region to which the recipient of the international incoming traffic belongs, or transfer the international incoming traffic to the municipal / state / league-level gateway switching device of the province / autonomous region to which the recipient of the international incoming traffic belongs; The intra-province / autonomous region gateway switching device is configured to, upon receiving the international incoming traffic, transfer the international incoming traffic to the intra-province / autonomous region gateway switching device of the operator to which the recipient of the international incoming traffic belongs; The city / state / alliance-level gateway switching device is configured to, upon receiving the international incoming traffic, transfer the international incoming traffic to the city / state / alliance-level gateway switching device of the operator to which the recipient of the international incoming traffic belongs; The regional long distance tandem device is further configured to, upon receiving the international incoming traffic and if the carrier to which the recipient of the international incoming traffic belongs is different from the carrier to which the regional long distance tandem device belongs, transfer the international incoming traffic to the municipal gateway switching device located at the location of the regional long distance tandem device in the region to which the recipient of the international incoming traffic belongs; The municipal gateway switching device is configured to, upon receiving the international incoming traffic, transfer the international incoming traffic to the municipal gateway switching device of the operator to which the recipient of the international incoming traffic belongs.

2. The communication system according to claim 1, wherein: The municipal traffic tandem device is further configured to, upon receiving international outbound traffic from a user located in the provincial capital / prefecture to which the municipal traffic tandem device belongs, or a user roaming to the municipal traffic tandem device, transfer the international outbound traffic to the provincial / autonomous region-level long distance tandem device in the province / autonomous region to which the municipal traffic tandem device belongs, or to transfer the international outbound traffic to the regional long distance tandem device to which the municipal traffic tandem device belongs; The city / state / league-level long-distance / local call tandem apparatus is further configured to, upon receiving international outbound call traffic dialed by a user located in the city / state / league to which the city / state / league-level long-distance / local call tandem apparatus belongs, or a user roaming to the city / state / league-level long-distance / local call tandem apparatus, transfer the international outbound call traffic to the provincial / autonomous region-level long-distance tandem apparatus of the province / autonomous region to which the city / state / league-level long-distance / local call tandem apparatus belongs; The provincial / autonomous region-level long distance tandem device is further configured to transfer the international outbound traffic to the international gateway switching device upon receiving the international outbound traffic; The regional long-distance tandem device is further configured to transfer the international outbound traffic to the international gateway switching device upon receiving the international outbound traffic; The international gateway switching device is further configured to, upon receiving the international outbound traffic, transfer the international outbound traffic to the international gateway switching device of the country to which the recipient of the international outbound traffic belongs.

3. The communication system according to claim 1, wherein: The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving domestic long distance incoming traffic and if the carrier to which the recipient of the domestic long distance incoming traffic belongs is the same as the carrier to which the provincial / autonomous region-level long distance tandem device belongs, transfer the domestic long distance incoming traffic to the municipal traffic tandem device in the provincial capital / state capital of the province / autonomous region to which the recipient of the domestic long distance incoming traffic belongs, or to transfer the domestic long distance incoming traffic to the municipal / state / league-level long distance / local traffic tandem device in a non-provincial capital / non-state capital of the province / autonomous region to which the recipient of the domestic long distance incoming traffic belongs; The municipal traffic tandem device is further configured to, upon receiving the domestic long-distance incoming traffic, transfer the domestic long-distance incoming traffic to a recipient of the domestic long-distance incoming traffic; The city / state / league-level long-distance / local call tandem device is further configured to transfer the domestic long-distance input call traffic to the recipient of the domestic long-distance input call traffic upon receiving the domestic long-distance input call traffic.

4. The communication system according to claim 3, wherein: The communication system further includes a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and the province / autonomous region-level long distance tandem device is connected to the plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities in the province / autonomous region where the province / autonomous region-level long distance tandem device is located; The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving the domestic long distance incoming traffic and if the carrier to which the recipient of the domestic long distance incoming traffic belongs is different from the carrier to which the provincial / autonomous region-level long distance tandem device belongs, transfer the domestic long distance incoming traffic to the intra-provincial / autonomous region-level gateway switching device in the provincial capital / capital city of the province / autonomous region to which the recipient of the domestic long distance incoming traffic belongs, or transfer the domestic long distance incoming traffic to the municipal / state / league-level gateway switching device in a non-provincial capital / non-capital city of the province / autonomous region to which the recipient of the domestic long distance incoming traffic belongs; The intra-provincial / autonomous region gateway switching device is configured to, upon receiving the domestic long-distance incoming traffic, transfer the domestic long-distance incoming traffic to the intra-provincial / autonomous region gateway switching device of the operator to which the recipient of the domestic long-distance incoming traffic belongs; The city / state / alliance-level gateway switching device is used to transfer the domestic long-distance input traffic to the city / state / alliance-level gateway switching device of the operator to which the recipient of the domestic long-distance input traffic belongs when receiving the domestic long-distance input traffic.

5. The communication system according to claim 3 or 4, characterized in that The municipal traffic tandem device is further configured to, upon receiving domestic long-distance outbound traffic from a user located in the provincial capital / city to which the municipal traffic tandem device belongs, or a user roaming to the municipal traffic tandem device, transfer the domestic long-distance outbound traffic to the provincial / autonomous region-level long-distance tandem device in the province / autonomous region to which the municipal traffic tandem device belongs; The city / state / league-level long-distance / local call tandem apparatus is further configured to, upon receiving domestic long-distance outbound call traffic from a user located in the province / state / league-level long-distance / local call tandem apparatus or a user roaming to the city / state / league-level long-distance / local call tandem apparatus, transfer the domestic long-distance outbound call traffic to the provincial / autonomous region-level long-distance tandem apparatus of the province / autonomous region to which the city / state / league-level long-distance / local call tandem apparatus belongs; The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving the domestic long distance outbound traffic and when a direct circuit exists between the provincial / autonomous region-level long distance tandem device and the provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the domestic long distance outbound traffic belongs, transfer the domestic long distance outbound traffic to the provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the domestic long distance outbound traffic belongs; The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving the domestic long distance outbound traffic and when no direct circuit exists between the provincial / autonomous region-level long distance tandem device and the provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the domestic long distance outbound traffic belongs, transfer the domestic long distance outbound traffic to the regional long distance tandem device of the region to which the recipient of the domestic long distance outbound traffic belongs; The regional long distance tandem device is further configured to, upon receiving the domestic long distance outbound traffic, transfer the domestic long distance outbound traffic to the provincial / autonomous region-level long distance tandem device of the province / autonomous region to which the recipient of the domestic long distance outbound traffic belongs. The communication system according to claim 1 , wherein: The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving a first long distance call, transfer the first long distance call to the municipal-level traffic tandem device of the provincial / autonomous region-level capital city to which the provincial / autonomous region-level long distance tandem device belongs, if the first long distance call is received by a recipient of the first long distance call to the provincial / autonomous region-level capital city; The municipal traffic tandem device is further configured to, upon receiving the first long-distance traffic, transfer the first long-distance traffic to a recipient of the first long-distance traffic; The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving the first long distance traffic and when the recipient of the first long distance traffic belongs to a city other than the provincial capital / non-capital city of the province / autonomous region to which the provincial / autonomous region-level long distance tandem device belongs, transfer the first long distance traffic to the city / state / league-level long distance / local tandem device to which the recipient of the first long distance traffic belongs; The city / state / league-level long-distance / local call tandem device is further configured to, upon receiving the first long-distance call, transfer the first long-distance call to a recipient of the first long-distance call; The first long distance traffic is a long distance traffic within a province / autonomous region dialed by a user located in the province / autonomous region to which the provincial / autonomous region-level long distance tandem apparatus belongs, or a user roaming to the provincial / autonomous region-level long distance tandem apparatus; The operator to which the recipient of the first long-distance call belongs is the same as the operator to which the provincial / autonomous region-level long-distance tandem device belongs; when the originating party of the first long-distance call belongs to the provincial capital / capital, the first long-distance call is transferred by the municipal-level call tandem device of the provincial capital / capital to the provincial / autonomous region-level long-distance tandem device; when the originating party of the first long-distance call belongs to a non-provincial capital / non-capital, the first long-distance call is transferred by the municipal / state / league-level long-distance / city call tandem device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance tandem device.

7. The communication system according to claim 6, wherein: The communication system further includes a plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities, and the province / autonomous region-level long distance tandem device is connected to the plurality of city / state / league-level gateway switching devices belonging to non-provincial capitals / non-capital cities in the province / autonomous region where the province / autonomous region-level long distance tandem device is located; The provincial / autonomous region-level long distance tandem device is further configured to, upon receiving a second long distance call, transfer the second long distance call to the city / state / league-level gateway switching device to which the recipient of the second long distance call belongs, if the recipient of the second long distance call belongs to a non-provincial capital / non-capital city of the province / autonomous region to which the provincial / autonomous region-level long distance tandem device belongs; The city / state / alliance-level gateway switching device is configured to, upon receiving the second long-distance traffic, transfer the second long-distance traffic to the city / state / alliance-level gateway switching device of the carrier to which the recipient of the second long-distance traffic belongs; In which, the second long-distance traffic is a long-distance traffic within the province / autonomous region dialed by a user located in the province / autonomous region to which the provincial / autonomous region-level long-distance tandem device belongs, or a user roaming to the provincial / autonomous region-level long-distance tandem device, and the operator to which the recipient of the second long-distance traffic belongs is different from the operator to which the provincial / autonomous region-level long-distance tandem device belongs; when the dialing party of the second long-distance traffic belongs to the provincial capital / capital, the second long-distance traffic is transferred by the municipal traffic tandem device of the provincial capital / capital to the provincial / autonomous region-level long-distance tandem device; when the dialing party of the second long-distance traffic belongs to a non-provincial capital / non-capital, the second long-distance traffic is transferred by the municipal / state / league-level long-distance / city traffic tandem device of the non-provincial capital / non-capital to the provincial / autonomous region-level long-distance tandem device.

8. The communication system according to claim 7, wherein: The communication system further comprises: a provincial / autonomous region gateway switching device, the provincial / autonomous region gateway switching device being connected to the municipal-level traffic tandem device of the provincial capital / capital to which the provincial / autonomous region gateway switching device belongs, and a plurality of municipal / state / league-level long-distance / local traffic tandem devices of non-provincial capitals / non-capital cities in the province / autonomous region to which the provincial / autonomous region gateway switching device belongs; The city / state / league-level long-distance / local call tandem device is further configured to, upon receiving a third long-distance call, transfer the third long-distance call to the intra-provincial / autonomous region gateway switching device of the province / autonomous region to which the city / state / league-level long-distance / local call tandem device belongs; The intra-province / autonomous region gateway switching device is configured to, upon receiving the third long distance traffic, transfer the third long distance traffic to the intra-province / autonomous region gateway switching device of the operator to which the third long distance traffic belongs; Among them, the third long-distance call is a long-distance call within the province / autonomous region made by a user located in the city / state / league to which the city / state / league-level long-distance / local call tandem device belongs, or a user roaming to the city / state / league-level long-distance / local call tandem device; the recipient of the third long-distance call belongs to the provincial capital / capital where the gateway switching device in the province / autonomous region is located; the operator to which the maker of the third long-distance call belongs is different from the operator to which the recipient of the third long-distance call belongs.

9. The communication system according to claim 1, wherein: The communication system further comprises: a provincial / autonomous region gateway switching device belonging to a provincial capital / capital, the provincial / autonomous region gateway switching device being connected to the municipal-level traffic tandem device belonging to the provincial capital / capital, and a plurality of municipal / state / league-level long-distance / local traffic tandem devices belonging to non-provincial capitals / non-capital regions in the province / autonomous region to which the provincial / autonomous region gateway switching device belongs; The intra-provincial / autonomous region gateway switching device is further configured to, upon receiving inter-network input traffic, transfer the inter-network input traffic to the municipal-level traffic tandem device of the provincial capital / state to which the recipient of the inter-network input traffic belongs, or transfer the inter-network input traffic to the municipal / state / league-level long-distance / local traffic tandem device of a non-provincial capital / non-state to which the recipient of the inter-network input traffic belongs, wherein the operator to which the outgoing party of the inter-network input traffic belongs is different from the operator to which the intra-provincial / autonomous region gateway switching device belongs, and the operator to which the recipient of the inter-network input traffic belongs is the same as the operator to which the intra-provincial / autonomous region gateway switching device belongs; The municipal traffic tandem device is further configured to transfer the inter-network input traffic to a recipient of the inter-network input traffic upon receiving the inter-network input traffic; The city / state / league-level long-distance / local call tandem device is further configured to transfer the inter-network input traffic to a recipient of the inter-network input traffic upon receiving the inter-network input traffic.

10. The communication system according to claim 9, wherein: The municipal traffic tandem device is further configured to, upon receiving inter-network outbound traffic from a user located in the provincial capital / prefecture to which the municipal traffic tandem device belongs, or a user roaming to the municipal traffic tandem device, transfer the inter-network outbound traffic to the provincial / autonomous region gateway switching device in the provincial capital / prefecture to which the municipal traffic tandem device belongs; The city / state / league-level long-distance / local call tandem device is further configured to, upon receiving inter-network outbound traffic dialed by a user located in the province / state / league-level long-distance / local call tandem device or a user roaming to the city / state / league-level long-distance / local call tandem device, transfer the inter-network outbound traffic to the intra-provincial / autonomous region gateway switching device in the province / autonomous region to which the city / state / league-level long-distance / local call tandem device belongs; The intra-province / autonomous region gateway switching device is further configured to, upon receiving the inter-network output traffic, transfer the inter-network output traffic to the intra-province / autonomous region gateway switching device of the operator to which the recipient of the inter-network output traffic belongs; Among them, the operator to which the outgoing party of the inter-network output traffic belongs is the same as the operator to which the gateway switching device in the province / autonomous region belongs, the operator to which the receiving party of the inter-network output traffic belongs is different from the operator to which the gateway switching device in the province / autonomous region belongs, and the province / autonomous region to which the outgoing party of the inter-network output traffic belongs is the same as the province / autonomous region to which the receiving party of the inter-network output traffic belongs.

11. The communication system according to claim 10, wherein: The communication system further comprises: the provincial / autonomous region gateway switching device, the municipal level traffic tandem device and the provincial / autonomous region level long distance tandem device arranged in the sub-center city within the province / autonomous region; Among them, the telephone traffic within the province / autonomous region is taken over by the provincial / autonomous region gateway switching device, the municipal telephone traffic tandem device and the provincial / autonomous region long-distance tandem device in the provincial capital / capital of the province / autonomous region, and the provincial / autonomous region gateway switching device, the municipal telephone traffic tandem device and the provincial / autonomous region long-distance tandem device in the sub-center city serve as backup devices; or, the provincial / autonomous region gateway switching device, the municipal telephone traffic tandem device and the provincial / autonomous region long-distance tandem device in the provincial capital / capital of the province / autonomous region, and the provincial / autonomous region gateway switching device, the municipal telephone traffic tandem device and the provincial / autonomous region long-distance tandem device in the sub-center city all bear the telephone traffic within the province / autonomous region.

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