Telephone systems and telephone control devices

Abstract

To seamlessly and easily switch an external telephone call from an extension telephone terminal to a mobile telephone terminal without significantly increasing hardware scale.SOLUTION: An extension telephone terminal 20 notifies a telephone control device 10 of a call switching request in response to call switching operation, automatically answers an extension telephone call from the telephone control device 10 in response to the call switching request, the telephone control device 10 calls the target extension telephone terminal 20 that is a notification source of the call switching request in response to the call switching request, and switches and connects an external telephone call with a telephone network connected to a mobile phone terminal 30 corresponding to the target extension telephone terminal via the telephone control device 10 from a call with the mobile telephone terminal 30 to a call with the target extension telephone terminal 20 in response to the automatic answer on the target extension telephone terminal for the extension telephone call.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a telephone control technique for seamlessly switching an outside call between an extension telephone terminal and a mobile telephone terminal in a telephone system. [Background technology]

[0002] In recent years, in telephone systems such as business phone systems and PBX systems, with the rapid spread of mobile information terminals (hereinafter referred to as mobile phone terminals) with calling functions such as smartphones and pads, so-called mobile phone terminal extension technology, in which a mobile phone terminal is used as one of the internal telephone terminals, is being realized.

[0003] As one such internal line technology, Patent Document 1 describes a technology in which a telephone system accommodates a docking station for connecting a smartphone (smart device) as an internal telephone terminal, and a telephone control device (IP telephone exchange) controls incoming calls to the smartphone's internal number as incoming calls to the docking station's internal number.

[0004] In this technology, a UC server is provided in the telephone system, and session information required for switching an outside call between the docking station and the smartphone is exchanged between the docking station, the smartphone, and the telephone control device via the UC server. For example, when switching a call in progress on the handset (business handset unit) of the docking station to the smartphone, first, switching control information (session information) is displayed on the display screen of the docking station as a QR code (registered trademark), which is read by an app on the smartphone and notified to the telephone control device via the UC server. The docking station also notifies the telephone control device of the switching control information via the UC server. Based on this switching control information, the telephone control device controls switching of the call in progress on the handset to the smartphone. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-175818 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, such conventional technology has the problem that the QR code is used to exchange switching control information between the smartphone and the docking station, which makes the user operation cumbersome.In addition, a UC server is required to exchange switching control information between the smartphone and the docking station and the telephone control device, and a docking station is required for each smartphone, which causes a significant increase in the hardware scale of the telephone system.

[0007] The present invention is made to solve these problems, and aims to provide a telephone control technology that can seamlessly and easily switch an outside call from an internal telephone terminal to a mobile phone terminal without significantly increasing the hardware scale. [Means for solving the problem]

[0008] In order to achieve this object, the telephone system of the present invention is a telephone system comprising an internal telephone terminal and a telephone control device which switches and connects the internal telephone terminal to a telephone network, the internal telephone terminal being provided with a terminal control unit which notifies the telephone control device of a call switching request in response to a call switching operation and automatically responds to an internal call from the telephone control device in response to the call switching request, the telephone control device being provided with a control unit which makes an internal call to a target internal telephone terminal which is the source of the call switching request in response to the call switching request, and which switches and connects an external call to the telephone network which was connected to a mobile telephone terminal corresponding to the target internal telephone terminal via the telephone control device from a call with the mobile telephone terminal to a call with the target internal telephone terminal in response to the automatic response to the internal call at the target internal telephone terminal.

[0009] In addition, the telephone control device of the present invention is a telephone control device used in a telephone system that switches and connects internal telephone terminals to a telephone network, and is equipped with an internal interface unit that accommodates internal telephone terminals and a control unit that controls external calls made by the internal telephone terminals via the telephone network, and in response to a call switching request notified from a target internal telephone terminal among the internal telephone terminals that is to be the source of call switching, an internal call is made to the target internal telephone terminal, and in response to an automatic response by the target internal telephone terminal to the internal call, an external call with the telephone network that was connected to a mobile telephone terminal that is to be the source of call switching via the telephone control device is switched and connected from the call with the mobile telephone terminal to the call with the target internal telephone terminal. Effect of the Invention

[0011] According to the present invention, the extension telephone terminal or mobile phone terminal to be switched is automatically identified and the external call is automatically switched by the user simply performing the call switching operation. Therefore, unlike the conventional technology described above, it is not necessary to read the QR code using a mobile phone terminal, and the user's workload required for call switching can be significantly reduced, and the external call can be seamlessly and easily switched between the extension telephone terminal and the mobile phone terminal. In addition, since it is not necessary to use a UC server or docking station for extension as in the conventional technology, the hardware scale is not significantly increased. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a block diagram showing a configuration of a telephone system. [Diagram 2] FIG. 2 is a block diagram showing a configuration of an extension telephone terminal; [Diagram 3] FIG. 2 is a block diagram showing the configuration of a mobile phone terminal. [Figure 4] FIG. 4 is a sequence diagram showing a call switching operation according to the first embodiment. [Diagram 5] FIG. 11 is a sequence diagram showing a call switching operation according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Next, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] First, a telephone system 1 according to the present embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the telephone system. The telephone system 1 is generally composed of a general business phone system or PBX system, and is made up of a telephone control device 10 and a plurality of extension telephone terminals 20 as shown in FIG.

[0014] The telephone control device 10 consists of a main device of a business phone system or a PBX device of a PBX system, and is connected to the telephone network NW via a communication line L1, and is a device that switches and connects multiple internal telephone terminals 20 accommodated under it to the telephone network NW via an internal line L2. The present invention is adapted to perform call switching of an outside call via the telephone network NW between the extension telephone terminal 20 and the mobile phone terminal 30 by cooperating with the mobile phone terminal 30 via the telephone network NW. Also, by performing wireless communication between the extension telephone terminal 20 and the mobile phone terminal 30, switching control information required for call switching is exchanged.

[0015] Specific examples of the telephone network NW include an IP telephone network, a PSTN (Public Switched Telephone Network), and an ISDN (Integrated Services Digital Network). The telephone network NW also includes a mobile phone network that connects to the mobile phone terminal 30 via a wireless line to realize a call.

[0016] [Telephone control device] As shown in FIG. 1, the telephone control device 10 includes a network interface unit (hereinafter referred to as a network I / F unit) 11, an extension interface unit (hereinafter referred to as an extension I / F unit) 12, a memory unit 13, and a control unit 14.

[0017] The network I / F unit 11 is connected to the telephone network NW via a communication line L1, and transmits and receives various call control messages and voice. The extension I / F unit 12 transmits and receives various control commands and voices to and from a plurality of extension telephone terminals 20 via the extension line L2.

[0018] The storage unit 13 is made up of a storage device such as a hard disk or a semiconductor memory, and stores various call control data 13A and programs 13P used for call control in the telephone control device 10. The call control data 13A is control data for performing call control such as outgoing / incoming calls and telephone conversations related to the extension telephone terminal 20, and also includes switching control information used for call switching control, which will be described later. The programs 13P are programs that realize various processing units used for call control by working together with the CPU of the control unit 14. The programs 13P are read from an external device or a recording medium connected to the telephone control device 10, and are stored in the storage unit 13 in advance.

[0019] The control unit 14 has a CPU and its peripheral units, and executes the program 13P read from the storage unit 13 to make the CPU and the program 13P work together to realize various processing units used for processing call control and call switching control. The main processing unit realized by the control unit 14 is a call control unit 14A.

[0020] The call control unit 14A has a function of exchanging call control messages with the telephone network NW via the network I / F unit 11, and also performs call control such as outgoing / incoming calls and telephone conversations regarding the extension telephone terminal 20 based on the call control data 13A stored in the storage unit 13. The general call control executed by the call control unit 14A is similar to that in a business phone system or a PBX system, and a detailed description thereof will be omitted here.

[0021] In addition, the call control unit 14A has, as functions related to call switching control, a function to make an external call to the mobile phone terminal 30 via the telephone network NW in response to a call switching request from the mobile phone terminal 30 to be the destination of the call switching, received by the internal telephone terminal 20 via wireless communication, and a function to switch and connect an external call with the telephone network NW that was connected to the target internal telephone terminal 20 to be the source of the call switching, via the telephone control device 10, from a call with the target internal telephone terminal 20 to a call with the mobile phone terminal 30 in response to the response to the external call from the mobile phone terminal 30.

[0022] Specifically, the call control unit 14A has a function of acquiring a mobile phone number indicating the telephone number of the mobile phone terminal 30 from a call switching request from the mobile phone terminal 30 that is the destination of the call switching, and making an outside call to the mobile phone terminal 30 using the acquired mobile phone number, a function of returning a system telephone number indicating the calling telephone number for call switching to the mobile phone terminal 30 via the extension telephone terminal 20 in response to the call switching request, as call switching permission for the call switching request, a function of putting on hold a target outside call with the telephone network NW that was connected to the target extension telephone terminal 20 that is the source of the call switching via the telephone control device 10 in response to the call switching request, and a function of releasing the target outside call from hold and switching and connecting it to the outside call with the mobile phone terminal 30 in response to the response to the outside call at the mobile phone terminal 30.

[0023] [Extension telephone terminal] Next, the configuration of the extension telephone terminal 20 will be described with reference to Fig. 2. Fig. 2 is a block diagram showing the configuration of the extension telephone terminal. As shown in FIG. 2, the extension telephone terminal 20 includes an extension interface unit (hereinafter, referred to as an extension I / F unit) 21, a wireless communication unit 22, a call unit 23, a storage unit 24, and a terminal control unit 25.

[0024] The extension I / F unit 21 transmits and receives various control commands and voices to and from the telephone control device 10 via the extension line L2. The wireless communication unit 22 forms a wireless line L3 with the mobile phone terminal 30 via the wireless line L3 based on a wireless communication method such as Bluetooth (registered trademark) or wireless LAN, and exchanges switching control information used for call switching control by performing wireless communication via the wireless line L3.

[0025] The main switching control information used for call switching control is the mobile phone number and the system phone number. The mobile phone number is the phone number of the mobile phone terminal 30, and is used as the destination phone number when making an outside call to a mobile phone number from the telephone control device 10. The system phone number is the phone number of the telephone control device 10, and is used as the source phone number when making an outside call to a mobile phone number from the telephone control device 10.

[0026] The call unit 23 outputs the voice received from the telephone control device 10 via the internal I / F unit 21 from the speaker, and transmits the voice input from the microphone to the telephone control device 10 via the internal I / F unit 21, thereby making a voice call on the internal telephone terminal 20. The storage unit 24 is made up of a storage device such as a semiconductor memory, and stores various processing data and programs used for terminal control processing in the extension telephone terminal 20.

[0027] The terminal control unit 25 has a CPU and its peripheral units, and executes a program read from the storage unit 24 to cause the CPU and the program to operate in cooperation with each other, thereby executing terminal control processing. The terminal control processing includes a process of transferring a call switching request received from the mobile phone terminal 30 via the wireless communication unit 22 to the telephone control device 10 via the internal line I / F unit 21, and a process of transferring a call switching permission notified from the telephone control device 10 via the internal line I / F unit 21 to the mobile phone terminal 30 via the wireless communication unit 22.

[0028] [Mobile phone terminal] Next, the configuration of the mobile phone terminal 30 will be described with reference to Fig. 3. Fig. 3 is a block diagram showing the configuration of the mobile phone terminal. As shown in FIG. 3, the mobile phone terminal 30 includes a network interface unit (hereinafter referred to as a network I / F unit) 31, a wireless communication unit 32, a call unit 33, a storage unit , and a terminal control unit .

[0029] The network I / F unit 31 is connected to the telephone network NW via a communication line L4, and transmits and receives various call control messages and voice. The wireless communication unit 32 forms a wireless line L3 with the extension telephone terminal 20 based on a wireless communication method such as Bluetooth or wireless LAN, and exchanges switching control information used for call switching control by performing wireless communication via the wireless line L3. The main switching control information used for call switching control includes a mobile phone number and a system telephone number.

[0030] The call unit 33 outputs the voice received from the telephone network NW via the network I / F unit 31 from the speaker, and transmits the voice input from the microphone to the telephone network NW via the network I / F unit 31, thereby making a voice call on the mobile phone terminal 30. The storage unit 34 is made up of a storage device such as a semiconductor memory, and stores various processing data and programs used in the processing of call control and call switching control in the mobile phone terminal 30.

[0031] The terminal control unit 35 has a CPU and its peripheral units, and executes a program read from the storage unit 34 to cause the CPU and the program to operate in cooperation with each other, thereby performing call control and call switching control. The call control includes a process of controlling calls, such as incoming and outgoing calls and conversations, related to the mobile phone terminal 30, based on the control data in the storage unit .

[0032] The call switching control includes a process of transmitting a call switching request from the wireless communication unit 32 to the extension telephone terminal 20 via the wireless line L3 in response to a user operation, a process of receiving, via the wireless communication unit 32 via the wireless line L3, a call switching permission returned from the extension telephone terminal 20 in response to the call switching request, and a process of immediately and automatically responding to an outside call originating from a system telephone number notified from the telephone network NW via the network I / F unit 31. These call switching controls may be realized by executing, in the terminal control unit 35, a dedicated application downloaded in advance from the telephone network NW and stored in the storage unit 34.

[0033] [Operation of the first embodiment] Next, a call switching operation of the telephone system 1 according to the present embodiment will be described with reference to Fig. 4. Fig. 4 is a sequence diagram showing a call switching operation according to the first embodiment.

[0034] Assume that the extension telephone terminal 20 is in an outside call with the other telephone device 40 connected to the telephone network NW via the telephone control device 10 (step S100), and a wireless line L3 is formed between the extension telephone terminal 20 and the user's mobile phone terminal 30 (step S101). The formation of the wireless line L3 may be performed after the call switching operation in step S102. In this state, when switching the outside call from the extension telephone terminal 20 to the user's own mobile phone terminal 30, the user performs a call switching operation on the mobile phone terminal 30 (step S102).

[0035] In response to the user's call switching operation, the mobile phone terminal 30 transmits a call switching request including its own mobile phone number to the extension telephone terminal 20 via the wireless line L3 (step S103). When the extension telephone terminal 20 receives the call switching request from the mobile phone terminal 30 via the wireless line L3, the extension telephone terminal 20 transfers the call switching request to the telephone control device 10 via the extension line L2 (step S104).

[0036] In response to the call switching request from the mobile phone terminal 30 transferred from the extension telephone terminal 20, the telephone control device 10 obtains the mobile phone number included in the call switching request as the switching destination telephone number, and returns call switching permission including the system telephone number, which is the calling telephone number for call switching, to the extension telephone terminal 20 via the extension line L2 (step S105).

[0037] When the extension telephone terminal 20 receives the call switching permission from the telephone control device 10 via the extension line L2, the extension telephone terminal 20 transfers the call switching permission to the mobile telephone terminal 30 via the wireless line L3 (step S106). When the mobile phone terminal 30 receives call switching permission from the internal telephone terminal 20 via the wireless line L3, it acquires the system telephone number included in the call switching permission as the calling telephone number for call switching, and starts waiting for an outside call from the calling telephone number (step S107).

[0038] Meanwhile, in response to the call switching request, the telephone control device 10 identifies the internal telephone terminal 20 that has notified the call switching request as the target internal telephone terminal 20 to be the source of the call switching (step S110), and executes an external call to the telephone network NW with the destination telephone number as the call destination and the system telephone number as the call source (step S111).

[0039] The mobile phone terminal 30 checks the caller in response to an outside call from the telephone network NW (step S112), and if the caller matches the system telephone number notified by the call switching permission, immediately and automatically responds to the outside call (step S113). As a result, a response is transmitted from the mobile phone terminal 30 to the telephone control device 10 via the telephone network NW (step S114).

[0040] In response to the response from the mobile phone terminal 30, the telephone control device 10 switches and connects the call from the target extension telephone terminal 20 of the switching source identified in step S110 to the call with the mobile phone terminal 30 (step S115). As a result, the other telephone device 40 and the mobile phone terminal 30 start an outside call via the telephone control device 10 (step S116). After this, the telephone control device 10 disconnects the call of the target extension telephone terminal 20 (step S117), and accordingly, the target extension telephone terminal 20 goes into an end state (step S118), and a series of call switching operations ends. In this case, the call disconnection in step S117 may be executed at any timing after step S115.

[0041] In this sequence, the time required from step S110 to step S114 is extremely short, so the outside line call before switching is not put on hold and the outside line hold is not released. This allows the call to be switched seamlessly without the call recipient being aware of the call switching period. Also, the outside line may be put on hold and the outside line hold is not released, but even in this case, a hold tone is not sent to the other party's telephone device 40 so that the call recipient is not aware of the call switching.

[0042] [Advantages of the first embodiment] In this manner, in this embodiment, the internal telephone terminal 20 notifies the telephone control device 10 of a call switching request received via wireless communication from the mobile phone terminal 30 to be the destination of the call switching, transmits the call switching permission notified by the telephone control device 10 in response to the call switching request to the mobile phone terminal 30 via wireless communication, and the telephone control device 10 makes an external call to the mobile phone terminal 30 via the telephone network NW in response to the call switching request, and in response to the response of the mobile phone terminal 30 to the external call, switches and connects the external call with the telephone network NW connected to the target internal telephone terminal 20, which is the source of the call switching request, from the call with the target internal telephone terminal 20 to the call with the mobile phone terminal 30.

[0043] As a result, the user only needs to perform a call switching operation on the mobile phone terminal 30, and switching control information used for call switching control is automatically exchanged between the mobile phone terminal 30 and the telephone control device 10 via the extension telephone terminal 20, and the extension telephone terminal 20 that relays and forwards the switching control information is automatically identified as the target extension telephone terminal 20 to be switched, and the outside call connected to the target extension telephone terminal 20 is automatically switched to the mobile phone terminal 30.

[0044] Therefore, unlike the conventional technology described above, it is no longer necessary to read a QR code using the mobile phone terminal 30, the workload on the user required for switching calls can be significantly reduced, and an outside call can be seamlessly and easily switched from the internal telephone terminal 20 to the mobile phone terminal 30. Also, call switching of outside calls can be realized simply by installing hardware for wireless communication with the mobile phone terminal 30 in the extension telephone terminal 20, and there is no need to use a UC server or docking station for extension as in the conventional technology, so the hardware scale does not increase significantly. Also, for call switching control in the telephone control device 10, existing call transmission control can be used, making it possible to avoid a significant increase in new software development work.

[0045] [Second embodiment] Next, a telephone system 1 according to a second embodiment of the present invention will be described. In the first embodiment, an example has been described in which an outside call is switched from the extension telephone terminal 20 to the mobile phone terminal 30. In the present embodiment, a case in which an outside call is switched from the mobile phone terminal 30 to the extension telephone terminal 20 will be described.

[0046] In this embodiment, the terminal control unit 25 of the internal telephone terminal 20 has the function of notifying the telephone control device 10 of a call switching request in response to a call switching operation, and automatically answering an internal call from the telephone control device 10 in response to the call switching request.

[0047] In addition, the control unit 14 of the telephone control device 10 has the function of making an internal call to the target internal telephone terminal 20 that is the source of the call switching request in response to a call switching request from the internal telephone terminal 20, and in response to an automatic response to the internal call at the target internal telephone terminal 20, switching and connecting an external call with the telephone network NW that was connected to the mobile phone terminal 30 corresponding to the target internal telephone terminal 20 via the telephone control device 10 from the call with the mobile phone terminal 30 to the call with the target internal telephone terminal 20. Other configurations of the telephone system 1 according to the present embodiment are similar to those shown in FIG. 1, and detailed description thereof will be omitted here.

[0048] [Operation of the second embodiment] Next, a call switching operation of the telephone system 1 according to the present embodiment will be described with reference to Fig. 5. Fig. 5 is a sequence diagram showing a call switching operation according to the second embodiment.

[0049] It is assumed that the mobile phone terminal 30 is engaged in an outside call with the other telephone device 40 connected to the telephone network NW via the telephone control device 10 (step S200). In this state, when switching the outside call of the mobile phone terminal 30 to the user's own extension telephone terminal 20, the user performs a call switching operation at the extension telephone terminal 20 (step S201). In response to the user's call switching operation, the extension telephone terminal 20 notifies the telephone control device 10 of a call switching request via the extension line L2 (step S202).

[0050] In response to a call switching request from an extension telephone terminal 20, the telephone control device 10 identifies the extension telephone terminal 20 that sent the call switching request as the target extension telephone terminal 20 to which the call will be switched, and identifies the mobile phone terminal 30 corresponding to the target extension telephone terminal 20 as the target mobile phone terminal 30 to which the call will be switched, and identifies the outside call connected to the target mobile phone terminal 30 as the target call to be switched (step S210).

[0051] In this case, the mobile phone terminal 30 of the user of the target extension telephone terminal 20 may be set in advance as the call control data 13A in the storage unit 13. Also, the mobile phone number of the mobile phone terminal 30 may be registered in the operation key of the call switching operation of the extension telephone terminal 20, and the mobile phone number of the mobile phone terminal 30 may be notified in the call switching request. Also, if there is a history of switching of an outside call from the extension telephone terminal 20 to the mobile phone terminal 30 by the call switching operation of Fig. 4, the target mobile phone terminal 30 may be specified based on the history information. Also, as in the call switching operation of Fig. 4, the mobile phone terminal 30 that forms the wireless line L3 with the target extension telephone terminal 20 at the time of the call switching operation may be specified as the target mobile phone terminal 30.

[0052] The telephone control device 10 identifies the target call (step S210), and makes an extension call to the target extension telephone terminal 20 via the extension line L2 (step S211). The target extension telephone terminal 20 immediately and automatically responds to the extension call from the telephone control device 10 (step S212). As a result, a response is transmitted from the target extension telephone terminal 20 to the telephone control device 10 via the extension line L2 (step S213).

[0053] In response to the response from the target extension telephone terminal 20, the telephone control device 10 switches and connects the outside call identified in step S210 from the call with the mobile phone terminal 30 to the call with the target extension telephone terminal 20 (step S214). As a result, an outside call is started between the other telephone device 40 and the target internal telephone terminal 20 via the telephone control device 10 (step S215). After this, the telephone control device 10 disconnects the outside call of the mobile telephone terminal 30 (step S216), and accordingly, the mobile telephone terminal 30 is put into an end state (step S217), and a series of call switching operations is terminated. In this case, the call disconnection in step S216 may be executed at any timing after step S214.

[0054] In this sequence, the time required from step S210 to step S214 is also very short, so that the outside line call before switching is not put on hold or released. Even if an outside line is put on hold, no hold tone is sent, as in the first embodiment.

[0055] [Advantages of the second embodiment] In this manner, in this embodiment, the internal telephone terminal 20 notifies the telephone control device 10 of a call switching request in response to a call switching operation, automatically responds to an internal call from the telephone control device 10 in response to the call switching request, and the telephone control device 10 makes an internal call to the target internal telephone terminal 20 which is the source of the call switching request in response to the call switching request from the internal telephone terminal 20, and in response to the automatic response to the internal call at the target internal telephone terminal 20, switches and connects an external call with the telephone network NW which was connected to the mobile telephone terminal 30 corresponding to the target internal telephone terminal 20 via the telephone control device 10 from the call with the mobile telephone terminal 30 to the call with the target internal telephone terminal 20.

[0056] As a result, the user only needs to perform a call switching operation on the extension telephone terminal 20, which is automatically identified as the target extension telephone terminal 20 to be switched to, and an outside call connected to the mobile phone terminal 30 corresponding to the target extension telephone terminal 20 is automatically switched to the target extension telephone terminal 20.

[0057] Therefore, unlike the conventional technology described above, it is no longer necessary to read a QR code using the mobile phone terminal 30, the workload on the user required for switching calls can be significantly reduced, and an outside call can be seamlessly and easily switched from the internal telephone terminal 20 to the mobile phone terminal 30. In addition, since there is no need to use a UC server or a docking station for extension as in the conventional technology, the hardware scale is not significantly increased. Also, for the call switching control in the telephone control device 10, the existing call transmission control can be used, making it possible to avoid a significant increase in the work of developing new software.

[0058] [Extended embodiment] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, the respective embodiments can be implemented in any combination within a range that does not contradict each other. [Explanation of symbols]

[0059] 1...telephone system, 10...telephone control device, 11...network I / F unit (network interface unit), 12...internal I / F unit (internal interface unit), 13...memory unit, 14...control unit, 20...internal telephone terminal, 21...internal I / F unit (internal interface unit), 22...wireless communication unit, 23...call unit, 24...memory unit, 25...terminal control unit, 30...mobile phone terminal, 31...network I / F unit (network interface unit), 32...wireless communication unit, 33...call unit, 34...memory unit, 35...terminal control unit, 40...other telephone device, L1...communication line, L2...internal line, L3...wireless line, L4...communication line, NW...telephone network.

Claims

1. A telephone system comprising an internal telephone terminal and a telephone control device for switching and connecting the internal telephone terminal to a telephone network, the extension telephone terminal includes a terminal control unit that notifies the telephone control device of a call switching request in response to a call switching operation, and automatically responds to an extension call from the telephone control device in response to the call switching request; The telephone control device includes a control unit that, in response to the call switching request, calls a target extension telephone terminal that is a notification source of the call switching request, and, in response to an automatic response to the extension call at the target extension telephone terminal, switches and connects an outside call with the telephone network that has been connected to a mobile phone terminal corresponding to the target extension telephone terminal via the telephone control device from the call with the mobile phone terminal to the call with the target extension telephone terminal.

1. A telephone system comprising:

2. A telephone control device used in a telephone system for switching and connecting an internal telephone terminal to a telephone network, comprising: an extension interface unit for accommodating an extension telephone terminal; a control unit for controlling an external call made by the extension telephone terminal through a telephone network, In response to a call switching request notified from a target extension telephone terminal that is a call switching source among the extension telephone terminals, an extension call is made to the target extension telephone terminal, and in response to an automatic response to the extension call at the target extension telephone terminal, an outside call with the telephone network that was connected to the mobile telephone terminal that is the call switching source via the telephone control device is switched and connected from the call with the mobile telephone terminal to the call with the target extension telephone terminal.

13. A telephone control device comprising:

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