Call method, command control device, and control program

Abstract

To provide a command control device that can continue a call even if a failure or the like occurs during the call.SOLUTION: A command control device includes a call information communication unit that, when itself is an operating rack, receives call information of another communication party from a communication network and notifies another command control device that is a standby rack of the call information, and an operation switching unit that performs processing to switch from the operating rack to the standby rack when itself switches to the standby rack during a call of a command terminal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a communication method, a command control device, and a control program. [Background technology]

[0002] The command control device and command terminal that control the reception of emergency calls are mission-critical devices that cannot be allowed to stop 24 hours a day, 365 days a year. The system must be configured to minimize the time when emergency calls cannot be received due to equipment failure, etc., and redundancy is achieved for the command control device by providing two physical devices: an operation rack and a standby rack.

[0003] The following Patent Document 1 discloses an IP telephone system in which a backup exchange backs up internal calls of a plurality of IP terminals within a base in the event of a failure in the IP exchange or a line. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-254096 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the IP telephone system described in Patent Document 1, if a failure occurs in the IP exchange, the IP terminal automatically switches the connection to the backup exchange, allowing new calls to be made after the switchover. However, if a failure occurs during a call, the call cannot be maintained.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and one exemplary purpose thereof is to provide a technology that enables a call to be continued even if a failure or the like occurs during the call. [Means for solving the problem]

[0007] A call method according to an exemplary aspect of the present disclosure is a call method in a system having at least a command terminal and a plurality of command control devices, and includes the command terminal registering terminal information of the command terminal with a first command control device that is an operation rack and a second command control device that is a standby rack, the first command control device receiving call information of the call partner from a communication network and notifying the second command control device of the call information, and when the first command control device switches to the standby rack and the second command control device switches to the operation rack during a call on the command terminal, the second command control device continues the call on the command terminal using the call information.

[0008] A command control device according to an exemplary aspect of the present disclosure includes a registration means for receiving terminal information of the command terminal from the command terminal and registering the terminal information, a call information communication means for receiving call information of the other party from a communication network when the command control device is an operation rack and notifying the call information to another command control device that is a standby rack, and an operation switching means for performing processing to switch from the operation rack to the standby rack when the command terminal switches to the standby rack during a call. [Effects of the Invention]

[0009] According to an exemplary aspect of the present disclosure, an exemplary effect is achieved in that a call can be continued even if a failure or the like occurs during a call. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram illustrating a configuration example of a command control device according to the present disclosure. [Figure 2] FIG. 1 is a flow diagram showing the flow of a call method according to the present disclosure. [Figure 3] 1 is a block diagram illustrating a configuration example of a communication system according to the present disclosure. [Figure 4] FIG. 2 is a diagram illustrating a call connection sequence of a communication system according to the present disclosure. [Figure 5]FIG. 1 is a diagram showing a sequence from call connection to call disconnection in a communication system according to the present disclosure. [Figure 6] FIG. 10 is a diagram illustrating a sequence when a failure occurs in a communication system according to the present disclosure. [Figure 7] FIG. 2 is a block diagram illustrating a configuration of a computer that functions as a command control device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following are examples of embodiments of the present invention. However, the present invention is not limited to the exemplary embodiments shown below, and various modifications are possible within the scope of the claims. For example, embodiments obtained by appropriately combining the technical means employed in the exemplary embodiments shown below may also be included in the scope of the present invention. Furthermore, embodiments obtained by appropriately omitting some of the technical means employed in the exemplary embodiments shown below may also be included in the scope of the present invention. Furthermore, the effects mentioned in the exemplary embodiments shown below are examples of effects expected in the exemplary embodiments, and do not define the scope of the present invention. In other words, embodiments that do not exhibit the effects mentioned in the exemplary embodiments shown below may also be included in the scope of the present invention.

[0012] First Exemplary Embodiment A first exemplary embodiment, which is one example of an embodiment of the present invention, will be described in detail with reference to the drawings. This exemplary embodiment is the basic form of each exemplary embodiment described later. Note that the scope of application of each technical means employed in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technical means employed in this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure to the extent that no particular technical obstacles arise. Furthermore, each technical means shown in the drawings referred to in describing this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure to the extent that no particular technical obstacles arise.

[0013] (Configuration of command control device 1) The configuration of the command control device 1 will be described with reference to FIG. 1. FIG. 1 is a block diagram showing an example of the configuration of the command control device 1. The command control device 1 is a device used in a system including at least a command terminal and multiple command control devices. One of the multiple command control devices 1 operates as an operating rack, and the other command control devices 1 operate as standby racks. As shown in FIG. 1, the command control device 1 includes a registration unit 11, a call information communication unit 12, and an operation switching unit 13.

[0014] The registration unit 11 receives terminal information of the command terminal from the command terminal and registers the terminal information. The command terminal is, for example, a terminal used for making emergency calls and has a multi-registration function. When the command terminal is started, it requests the command control device 1 to send a registry (Register), which is a command that instructs the registration of the terminal information of the command terminal. The registration unit 11 of the command control device 1 holds the terminal information of the command terminal instructed by the registry and registers the terminal information. The command control device 1 and the command terminal are connected so as to be able to communicate with each other via, for example, a TCP (Transmission Control Protocol) / IP (Internet Protocol) network. The terminal information is, for example, identification information of the command terminal, such as the IP address or MAC address of the command terminal.

[0015] When the call information communication unit 12 is an operating rack, it receives call information of the other party from a communication network and notifies the call information to another command control device that is a standby rack. The communication network is, for example, an NGN (Next Generation Network). The call information includes the other party's telephone number or IP address, port number, media information such as an audio codec (SDP (Session Description Protocol) information), etc.

[0016] When the operation switching unit 13 switches itself to the standby rack while the command terminal is in a call, it performs a process of switching from the operation rack to the standby rack. At this time, another command control device 1 operates as the operation rack and continues the call of the command terminal using the call information. Note that even when the command terminal is not in a call, it may switch itself to the standby rack, and in this case, the operation switching unit 13 performs a process of switching from the operation rack to the standby rack.

[0017] (Effect of command control device 1) As described above, in the command control device 1, when the command control device itself is the operating rack, the call information communication unit 12 receives call information of the other party from the communication network and notifies the call information to another command control device which is the standby rack. When the command control device 1 itself switches to the standby rack and another command control device 1 switches to the operating rack, the other command control device 1 uses this call information to continue the call of the command terminal. Therefore, even if a failure or the like occurs while the command terminal is in a call, the call can continue.

[0018] (Call flow) The flow of the communication method S1 will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the flow of the communication method S1. The communication method S1 is a communication method in a system including at least a command terminal and a plurality of command control devices, and includes steps S11 to S13 as shown in Fig. 2.

[0019] First, the command terminal registers the terminal information of the command terminal with the first command control device, which is the operation rack, and the second command control device, which is the standby rack. At this time, the first command control device and the second command control device receive and register the terminal information of the command terminal from the command terminal (S11). The first command control device and the second command control device and the command terminal are connected so as to be able to communicate with each other via, for example, a TCP / IP network. The terminal information is, for example, identification information of the command terminal, such as the IP address or MAC address of the command terminal.

[0020] Next, the first command control device receives call information of the other party from the communication network and notifies the second command control device of the call information (S12). The communication network is, for example, an NGN. The call information includes the other party's telephone number or IP address, port number, media information (SDP information) such as audio codec, etc.

[0021] Next, when the first command control device switches to the standby rack and the second command control device switches to the operating rack during a call on the command terminal, the second command control device continues the call on the command terminal using the call information (S13).

[0022] (Effect of calling method) As described above, in the communication method S1, when the first command control device switches to the standby rack and the second command control device switches to the operating rack while the command terminal is in communication, the second command control device continues the communication of the command terminal using the communication information. Therefore, even if a failure or the like occurs while the command terminal is in communication, the communication can be continued.

[0023] Second Exemplary Embodiment A second exemplary embodiment, which is one example of an embodiment of the present invention, will be described in detail with reference to the drawings. Components having the same functions as those described in the above exemplary embodiment will be assigned the same reference numerals, and their description will be omitted as appropriate. The scope of application of each technical means employed in this exemplary embodiment is not limited to this exemplary embodiment. That is, each technical means employed in this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical obstacles arise. Furthermore, each technical means shown in each drawing referenced to explain this exemplary embodiment can also be employed in other exemplary embodiments included in the present disclosure, to the extent that no particular technical obstacles arise.

[0024] (Configuration of communication system 100) The configuration of the communication system 100 will be described with reference to Fig. 3. Fig. 3 is a block diagram showing the configuration of the communication system 100. The communication system 100 includes a first command control device 1-1, a second command control device 1-2, a media gateway 2, an IP telephone service for emergency lines (hereinafter referred to as an NGN network), and command terminals 4-1 to 4-4. Each device is connected so as to be able to communicate via a TCP / IP network.

[0025] The NGN network 3 sends and receives emergency calls to and from the media gateway 2 in accordance with the NGN network emergency call interface specifications.

[0026] The media gateway 2 operates as a VoIP (Voice over Internet Protocol) gateway that mediates between the NGN network 3 and the first command control device 1-1 and second command control device 1-2, and has the function of establishing and maintaining a TCP connection between the first command control device 1-1 and the second command control device 1-2, and the function of multipoint transmitting an incoming emergency call from the NGN network 3 to the first command control device 1-1 and the second command control device 1-2. Multipoint transmission is a function that, when the media gateway 2 receives an incoming emergency call, sends a notification of the call to each of the first command control device 1-1 and the second command control device 1-2.

[0027] The first command control device 1-1 and the second command control device 1-2 relay call control messages in accordance with protocols such as SIP (Session Initiation Protocol) between the media gateway 2 and the command terminals 4-1 to 4-4, with which a TCP connection has been established. The first command control device 1-1 and the second command control device 1-2 also have a function of retaining call information such as the telephone number and IP address of the terminal of the other party that made the emergency call, which is received from the media gateway 2. Note that, although the number of command control devices is assumed to be two in the following description, the number of command control devices is not particularly limited.

[0028] The command terminals 4-1 to 4-4 have a call function, and ring when an incoming call is received, and by answering the call, a call can be made with the terminal of the other party who made the emergency call. Note that, although the number of command terminals is assumed to be four in the following description, the number of command terminals is not particularly limited.

[0029] 4 is a diagram for explaining a call connection sequence of the communication system 100 according to the present disclosure. In the following explanation, it is assumed that the first command control device 1-1 operates as an operating rack, and the second command control device 1-2 operates as a standby rack.

[0030] 4, first, the media gateway 2 establishes a TCP connection between the first command and control device 1-1 in the operation rack and the second command and control device 1-2 in the standby rack, and performs multi-registration. This process puts the first command and control device 1-1 and the second command and control device 1-2 in a state where they can receive call control messages from the media gateway 2.

[0031] Furthermore, when the control terminals 4-1 to 4-4 are started up, they register with the first command control device 1-1 of the operation rack and the second command control device 1-2 of the standby rack. This process puts the control terminals 4-1 to 4-4 in a state where they can receive call control messages from the first command control device 1-1 of the operation rack and the second command control device 1-2 of the standby rack.

[0032] Also, a TCP / IP connection is established between the first command control device 1-1 and the second command control device 1-2. This process enables the first command control device 1-1 and the second command control device 1-2 to send and receive information such as call information.

[0033] Next, as shown in Figure 4, when the media gateway 2 receives an incoming message from the NGN network 3 (S101), the media gateway 2 sends the incoming message to the first command control device 1-1 and the second command control device 1-2 with which a TCP connection has been established (S102, S103).

[0034] Next, when the first command control device 1-1 and the second command control device 1-2 receive the incoming message, the first command control device 1-1 and the second command control device 1-2 transmit the incoming message to the connected command terminals 4-1 to 4-4 (S104 to S107), and transmit a call message to the media gateway 2 (S108, S109). When the command terminals 4-1 to 4-4 receive the incoming message, they ring, and when the media gateway 2 receives the call message, it transmits a provisional response message to the NGN network 3 (S110).

[0035] Next, the command terminal 4-1 performs a response process to transmit a response message to the first command control device 1-1 on the operation rack (S111). When the first command control device 1-1 receives the response message from the command terminal 4-1, it stores the information. Furthermore, as will be described later, the first command control device 1-1 transmits the stored information to the second command control device 1-2.

[0036] When the first command control device 1-1 receives the response message from the command terminal 4-1, the first command control device 1-1 transmits the response message to the media gateway 2 (S112) and, as described below, transmits the information transmitted to the media gateway 2 to the second command control device 1-2. When the media gateway 2 receives the response message from the first command control device 1-1, the media gateway 2 transmits the response message to the NGN network 3 (S113).

[0037] After receiving the response message from the media gateway 2, the NGN network 3 transmits a final response message to the media gateway 2 (S114). This final message contains media information (SDP information) such as the telephone number or IP address of the other party, port number, and audio codec. This information is collectively called call information.

[0038] The media gateway 2 transmits the final response message from the NGN network 3 to the first command and control device 1-1 of the operation rack (S115). Upon receiving the final response message, the first command and control device 1-1 holds the call information.

[0039] The first command control device 1-1 also transmits a final response message to the command terminal 4-1 that responded (S116).Then, the first command control device 1-1 transmits the held call information to the second command control device 1-2 on the waiting rack (S117).After this, the command terminal 4-1 starts the call (S118).

[0040] 5 is a diagram showing the sequence from call connection to call disconnection in the communication system according to the present disclosure. First, when the media gateway 2 receives an incoming message from the NGN network 3 (S201), the media gateway 2 transmits the incoming message to the first command control device 1-1 and the second command control device 1-2 with which a TCP connection has been established (S202, S204). At this time, the first command control device 1-1 and the second command control device 1-2 retain the information transmitted by the media gateway 2 (S203, S205).

[0041] Thereafter, the command terminal 4-1 receives the incoming message from the first command control device 1-1, performs a response operation (S206), and transmits a response message to the first command control device 1-1 (S207).

[0042] Furthermore, when the media gateway 2 receives the call messages from the first command control device 1-1 and the second command control device 1-2, it transmits a provisional response message to the NGN network 3 (S208).

[0043] When the first command control device 1-1 receives the response message from the command terminal 4-1, it holds the information transmitted by the command terminal 4-1 (S209). Then, the first command control device 1-1 transmits the held information to the second command control device 1-2, which is a standby rack (S210). The second command control device 1-2 holds the information received from the first command control device 1-1 (S211).

[0044] Next, when the first command control device 1-1 receives a response message from the command terminal 4-1, the first command control device 1-1 transmits the response message to the media gateway 2 (S212) and transmits the information transmitted to the media gateway 2 to the second command control device 1-2 (S213). The second command control device 1-2 holds the information received from the first command control device 1-1 (S214).

[0045] When the media gateway 2 receives the response message from the first command control device 1-1, the media gateway 2 transmits the response message to the NGN network 3 (S215). After receiving the response message from the media gateway 2, the NGN network 3 transmits a final response message to the media gateway 2 (S216). This final message contains media information (SDP information) such as the telephone number or IP address of the other party, port number, and audio codec. This information is collectively called call information.

[0046] The media gateway 2 transmits the final response message from the NGN network 3 to the first command and control device 1-1 of the operation rack (S217). Upon receiving the final response message, the first command and control device 1-1 holds the call information (S218).

[0047] The first command control device 1-1 also transmits a final response message to the command terminal 4-1 that responded (S219).Then, the first command control device 1-1 transmits the retained call information to the second command control device 1-2 in the waiting rack (S220).The second command control device 1-2 retains the call information received from the first command control device 1-1 (S221).After this, the command terminal 4-1 starts the call (emergency call) (S222).

[0048] When the command terminal 4-1 performs a disconnection operation (S223), the command terminal 4-1 transmits a disconnection message to the first command control device 1-1 (S224). Upon receiving the disconnection message from the command terminal 4-1, the first command control device 1-1 transmits the disconnection message to the media gateway 2 (S225).

[0049] When the media gateway 2 receives the disconnection message from the first command control device 1-1, the media gateway 2 transmits a disconnection message to the NGN network 3 (S226). After receiving the disconnection message from the media gateway 2, the NGN network 3 transmits a disconnection completion message to the media gateway 2 (S227).

[0050] The media gateway 2 transmits the call end message from the NGN network 3 to the first command control device 1-1 of the operation rack (S228). Upon receiving the call end message, the first command control device 1-1 clears the call information of the emergency call with the command terminal 4-1 (S229).

[0051] The first command control device 1-1 notifies the second command control device 1-2, which is a standby unit, of clearing the call information (S230). Upon receiving the call information clear, the second command control device 1-2 clears the call information of the emergency call with the command terminal 4-1 (S231).

[0052] 6 is a diagram showing a sequence when a failure occurs in the communication system according to the present disclosure. First, when the command terminal 4-1 is started (S301), the command terminal 4-1 requests the first command control device 1-1, which is the operation unit, to send a "Register" command, which is a command to register terminal information of the command terminal 4-1 (S302).

[0053] The registration unit 11 of the first command control device 1-1 holds terminal information of the command terminal indicated by the registry and registers the terminal information. Then, the first command control device 1-1 notifies the command terminal 4-1 of completion of registry registration (200 OK) (S303). The first command control device 1-1 and the command terminal 4-1 are connected so as to be able to communicate with each other via, for example, a TCP / IP network.

[0054] Similarly, the command terminal 4-1 requests the second command control device 1-2, which is a standby device, to send a "Register" command, which is a command to register the terminal information of the command terminal 4-1 (S304). The registration unit 11 of the second command control device 1-2 holds the terminal information of the command terminal specified by the Registry and registers the terminal information. Then, the second command control device 1-2 notifies the command terminal 4-1 of the completion of registry registration (200 OK) (S305).

[0055] 5 (S306), and the call is made by the command terminal 4-1. At this time, if the second command control device 1-2 is on the standby rack, the call information communication unit 12 of the second command control device 1-2 receives call information of the other party from the first command control device 1-1, which is on the operating rack.

[0056] If a fault occurs in the first command control device 1-1 while the first command control device 1-1 is operating as the operation rack (S307), the operation status of the first command control device 1-1 transitions from "operation" to "standby" and an operation status notification message indicating that the operation status is "standby" is sent to the command terminal 4-1 (S308).

[0057] On the other hand, in response to the fact that the operation state of the first command control device 1-1 has changed from "operating" to "standby," the second command control device 1-2 transmits an operation state notification message indicating that the operation state is "operating" to the command terminal 4-1 (S309).No operation state notification message is transmitted to the other command control devices whose operation state has not changed.

[0058] When the operation status notification message updates the operation status of the second command control device 1-2 to "operating", the command terminal 4-1 switches the connection destination to the second command control device 1-2 (S310). When the command terminal 4-1 receives the operation status notification message while in a call with an emergency call, it switches the connection destination from the first command control device 1-1 to the second command control device while continuing the call. When the command terminal 4-1 receives a notification message from the second command control device 1-2 that the operation status is operating, it sends a connection destination switch message to the second command control device 1-2.

[0059] By switching the connection destination to the second command control device 1-2, the command terminal 4-1 can receive call control from the second command control device 1-2, which has become the new operating rack. In this way, when the second command control device 1-2 switches to the operating rack while the command terminal 4-1 is in a call, the operation switching unit 13 of the second command control device 1-2 performs processing to switch from the standby rack to the operating rack, and continues the call of the command terminal 4-1 using the call information. In addition, when the operation switching unit 13 of the second command control device 1-2 receives a connection destination switching message from the command terminal 4-1, it may also perform processing to switch from the standby rack to the operating rack.

[0060] Since the first command control device 1-1 on the operation rack and the second command control device 1-2 on the standby rack hold the same call information, even if the command terminal 4-1 switches the connection destination of the command control device while making an emergency call, the call information is not lost and call control of the command terminal 4-1 can be performed.

[0061] (Effects of communication system 100) As described above, in the communication system 100, when the operation switching unit 13 of the second command control device 1-2 receives a connection destination switching message from the command terminal 4-1, it performs processing to switch from the standby rack to the operating rack. Therefore, the command terminal 4-1 can easily switch the command control device to which it is connected.

[0062] Furthermore, in the communication system 100, the call information includes at least the telephone number or IP address of the other party, a port number, and media information. Therefore, even if the second command control device 1-2 transitions to the operating rack, the call can be continued.

[0063] Furthermore, when the second command control device 1-2 is on the standby rack, the call information communication unit 12 of the second command control device 1-2 receives call information of the other party from the first command control device 1-1, which is the operating rack. Therefore, even when the second command control device 1-2 transitions to the operating rack, the call can be continued.

[0064] [Software implementation example] Some or all of the functions of the command control device may be realized by hardware such as an integrated circuit (IC chip), or by software.

[0065] In the latter case, the command control device is realized by, for example, a computer that executes instructions of a program, which is software that realizes each function. An example of such a computer (hereinafter referred to as computer C) is shown in Fig. 7. Fig. 7 is a block diagram showing the hardware configuration of computer C that functions as the command control device.

[0066] The computer C includes at least one processor C1 and at least one memory C2. The memory C2 stores a program P for causing the computer C to operate as each of the above systems. In the computer C, the processor C1 reads and executes the program P from the memory C2, thereby realizing each function of the command control device.

[0067] The processor C1 may be, for example, a central processing unit (CPU), a graphic processing unit (GPU), a digital signal processor (DSP), a micro processing unit (MPU), a floating point number processing unit (FPU), a physics processing unit (PPU), a tensor processing unit (TPU), a quantum processor, a microcontroller, or a combination thereof. The memory C2 may be, for example, a flash memory, a hard disk drive (HDD), a solid state drive (SSD), or a combination thereof.

[0068] The computer C may further include a RAM (Random Access Memory) for expanding the program P during execution and for temporarily storing various data. The computer C may also include a communication interface for transmitting and receiving data to and from other devices. The computer C may also include an input / output interface for connecting input / output devices such as a keyboard, mouse, display, and printer.

[0069] Furthermore, the program P can be recorded on a non-transitory tangible recording medium M that can be read by the computer C. Such a recording medium M can be, for example, a tape, a disk, a card, a semiconductor memory, or a programmable logic circuit. The computer C can acquire the program P via such a recording medium M. The program P can also be transmitted via a transmission medium. Such a transmission medium can be, for example, a communication network or broadcast waves. The computer C can also acquire the program P via such a transmission medium.

[0070] [Appendix 1] This disclosure includes the techniques described in the following appendices. However, the present invention is not limited to the techniques described in the following appendices, and various modifications are possible within the scope of the claims.

[0071] (Appendix 1) A communication method in a system including at least a command terminal and a plurality of command control devices, The command terminal registers terminal information of the command terminal with a first command control device which is an operation rack and a second command control device which is a standby rack; the first command control device receives call information of the other party from a communication network and notifies the second command control device of the call information; When the first command control device is switched to a standby rack and the second command control device is switched to an operating rack during a call on the command terminal, the second command control device continues the call on the command terminal using the call information. How to call.

[0072] (Appendix 2) The calling method further comprises: the command terminal, when receiving a notification message indicating that the operation status is in operation from the second command control device, transmitting a connection destination switching message to the second command control device; The calling method described in Appendix 1.

[0073] (Appendix 3) The call information includes at least the telephone number or IP address of the call partner, a port number, and media information. A calling method as described in Appendix 1 or 2.

[0074] (Appendix 4) a registration means for receiving terminal information of the command terminal from the command terminal and registering the terminal information; A call information communication means for receiving call information of a call partner from a communication network when the call partner is an operating rack and notifying the call information to another command control device that is a standby rack; and an operation switching means for switching from the operation rack to the standby rack when the command terminal switches to the standby rack during a call. Command and control device.

[0075] (Appendix 5) When the device itself is a standby device, the communication information communication means receives the communication information of the other party from another command control device which is an operating device, When the command terminal is switched to the operating rack during a call, the operation switching means performs a process of switching from the standby rack to the operating rack, and continues the call of the command terminal using the call information. 5. The command control device according to claim 4.

[0076] (Appendix 6) the operation switching means, when receiving a connection destination switching message from the command terminal, performs a process of switching from the standby rack to the operating rack; 6. The command control device according to claim 5.

[0077] (Appendix 7) The call information includes at least the telephone number or IP address of the call partner, a port number, and media information. 7. The command control device according to any one of Supplementary notes 4 to 6.

[0078] (Appendix 8) A control program for causing a computer to operate as the command control device according to any one of Supplementary Notes 4 to 7, the control program causing the computer to function as each of the means. [Explanation of symbols]

[0079] 1,1-1,1-2 Command control device 2 Media Gateway 3 NGN network 4-1~4-4 Command terminal 11 Registration Department 12 Telecommunications Department 13 Operation Switching Unit 100 Communication Systems

Claims

1. A communication method in a system including at least a command terminal and a plurality of command control devices, The command terminal registers terminal information of the command terminal with a first command control device which is an operation rack and a second command control device which is a standby rack; the first command control device receives call information of the other party from a communication network and notifies the second command control device of the call information; When the first command control device is switched to a standby rack and the second command control device is switched to an operating rack during a call on the command terminal, the second command control device continues the call on the command terminal using the call information. How to call.

2. The calling method further comprises: the command terminal, when receiving a notification message indicating that the operation state is in operation from the second command control device, transmitting a connection destination switching message to the second command control device; The calling method according to claim 1.

3. The call information includes at least the telephone number or IP address of the call partner, a port number, and media information.

3. A communication method according to claim 1 or 2.

4. a registration means for receiving terminal information of the command terminal from the command terminal and registering the terminal information; A call information communication means for receiving call information of a call partner from a communication network when the call partner is an operating rack and notifying the call information to another command control device that is a standby rack; and an operation switching means for switching from the operation rack to the standby rack when the command terminal switches to the standby rack during a call. Command and control device.

5. When the device itself is a standby device, the communication information communication means receives the communication information of the other party from another command control device which is an operating device, When the command terminal is switched to the operating rack during a call, the operation switching means performs a process of switching from the standby rack to the operating rack, and continues the call of the command terminal using the call information. The command control device according to claim 4.

6. the operation switching means, when receiving a connection destination switching message from the command terminal, performs a process of switching from the standby rack to the operating rack; The command control device according to claim 5 .

7. The call information includes at least the telephone number or IP address of the call partner, a port number, and media information. The command control device according to any one of claims 4 to 6.

8. A control program for causing a computer to operate as the command control device according to any one of claims 4 to 6, the control program causing the computer to function as each of the means.

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