JP2013046083A - Communication control device, communication control method, and communication control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication control device, a communication control method, and a communication control program which can transfer an emergency call to an adequate emergency call communication board.SOLUTION: A communication system 1 comprises a communication control device 11, an emergency call communication board 12, a digital communication terminal 13, and analog communication terminals 14 and 18. The communication control device 11 performs communication to establish a session between the emergency call communication board 12 and the analog communication terminal 14 if it has received a request for establishing a session with the emergency call communication board 12 from the analog communication terminal 14 connected via a modular cable 17. This allows an emergency call to be originated to the emergency call communication board 12 by using the analog communication terminal 14. On the other hand, the communication control device 11 does not perform communication to establish a session between the emergency call communication board 12 and the digital communication terminal 13 not to establish the session if it has received a request for establishing a session with the emergency call communication board 12 from the digital communication terminal 13 connected via an IP network 16.

Description

  The present invention relates to a communication control device, a communication control method, and a communication control program for controlling communication between communication terminals.

  There is known a communication control device that is interposed between an Internet Protocol (IP) network and a Public Switched Telephone Networks (PSTN) network and mediates communication between the two networks. As a corresponding communication control device, there is a Voice over IP (VoIP) gateway or the like. The communication control device virtually recognizes the PSTN network as a Session Initiation Protocol User Agent (SIP UA), thereby requesting establishment of a session with a communication terminal connected to the PSTN network from another SIP UA connected to the IP network. Accept. The communication control device establishes a session with a communication terminal connected to the PSTN network based on the establishment request received from the IP network. This enables communication between a communication terminal connected to the IP network and a communication terminal connected to the PSTN network. For example, Patent Document 1 proposes a communication control device that accepts an emergency call (110, 119 call, etc.) for an emergency call communication base connected to the PSTN network from a communication terminal connected to the IP network.

JP 2010-89773 A

  When the communication control device described in Patent Literature 1 receives an emergency call from a communication terminal connected to the IP network, the communication control apparatus transfers the emergency call to an emergency call communication base directly connected via the PSTN network. Here, generally, the communication control device cannot accurately grasp the location of the communication terminal that has transmitted the emergency call. This is because information indicating the location of the communication terminal is not added to the emergency call. For this reason, when the communication terminal that sent the emergency call is connected to the IP network from a position far away from the communication control device, the communication control device The emergency call will be forwarded to. Thus, there is a problem that the communication control device may not be able to transfer the received emergency call to an appropriate emergency call communication stand.

  An object of the present invention is to provide a communication control device, a communication control method, and a communication control program capable of transferring an emergency call to an appropriate emergency call communication stand.

  A communication control apparatus according to a first aspect of the present invention mediates communication between a digital communication terminal connected to an IP network and an emergency call communication base connected to a PSTN network, and connects to the IP network and the PSTN network. In the communication control device configured to be enabled, a connection unit that connects to the analog communication terminal to communicate with the analog communication terminal, and the analog communication terminal connected by the connection unit to the emergency call communication stand A first receiving means for receiving a first establishment request for requesting establishment of a session, and when the first establishment request is received by the first receiving means, the emergency call communication base via the PSTN network In order to establish a session with the analog communication terminal, communication means for communicating with the emergency call communication stand, and from the digital communication terminal to the emergency call communication stand A second receiving means for receiving a second establishment request for requesting establishment of a session via the IP network, and when the second establishment request is received by the second receiving means, And a refusal means for refusing to establish a session between.

  According to the present invention, the communication control device includes connection means for connecting to an analog communication terminal. Since the analog communication terminal is directly connected to the communication control device, the analog communication terminal is disposed in the vicinity of the communication control device. When the establishment request is received from the analog communication terminal, the communication control apparatus establishes a session between the emergency call communication stand and the analog communication terminal that are directly connected via the PSTN network. For this reason, the analog communication terminal can establish a session with the emergency call communication stand arranged in the vicinity. The operator of the emergency call communication stand can appropriately cope with an emergency call transmitted from the analog communication terminal.

  On the other hand, when receiving the establishment request from the digital communication terminal, the communication control apparatus does not establish a session between the emergency call communication stand and the digital communication terminal because the location of the digital communication terminal is indefinite. In this way, the communication control device rejects the establishment of a session between the digital communication terminal and the emergency call communication terminal that may be arranged apart from each other, thereby preventing the emergency call communication terminal and the digital communication that are not appropriate. Communication with the terminal can be suppressed.

  In the first aspect, in a state where a session between the analog communication terminal and the emergency call communication stand has been established, a disconnect request for requesting disconnection of the session with the emergency call communication stand from the analog communication terminal. Third receiving means for receiving and maintaining means for maintaining a session between the analog communication terminal and the emergency call communication stand when the disconnection request is received by the third receiving means Good. Thereby, the emergency call communication stand can execute reverse communication through the session in the maintained state.

  In the first aspect, whether or not a signal for the analog communication terminal is received from the emergency call communication base via the session maintained between the analog communication terminal and the emergency call communication base by the maintenance means. A determination means for determining, and when the determination means determines that a signal for the analog communication terminal is received from the emergency call communication stand, an incoming call notification for the user of the analog communication terminal is transmitted to the analog communication terminal. You may provide the 1st transmission means. As a result, the communication control apparatus can notify the user of the analog communication terminal that reverse communication has been executed at the emergency call communication stand. The user of the analog communication terminal can recognize that reverse communication has been executed at the emergency call communication stand and can resume communication with the emergency call communication stand.

  In the first aspect, the determination means determines that a signal for the analog communication terminal is not received from the emergency call communication stand, and the disconnection request is received from the analog communication terminal by the third reception means. There may be provided a second transmission means for transmitting an incoming call notification for the user of the analog communication terminal to the analog communication terminal when the elapsed time after that has become a predetermined time or more. After receiving the disconnection request from the analog communication terminal, the communication control device transmits an incoming call notification to the analog communication terminal when the reverse communication is not executed for a predetermined time or more through the maintained session. The user of the analog communication terminal can resume communication with the emergency call communication base based on the incoming call notification. In this way, the communication control device can prompt the user to resume communication between the analog communication terminal and the emergency call communication terminal when the reverse communication from the emergency call communication terminal is not executed for a predetermined time or more.

  In the first aspect, in a state where a session between the analog communication terminal and the emergency call communication stand is established, a fourth receiving means for receiving an end notification for notifying the end of a call from the emergency call communication stand; In order to disconnect a session established between the analog communication terminal and the emergency call communication base when the end notification is received by the fourth receiving means, a session between the emergency call communication base and You may provide the 3rd transmission means which transmits the cutting | disconnection request | requirement which requests | requires a cutting | disconnection with respect to the said analog communication terminal. When an operation for terminating the communication with the analog communication terminal is executed in the emergency call communication stand, the communication control device can end the session between the emergency call communication stand and the analog communication terminal.

  A communication control method according to the second aspect of the present invention is a communication control method for mediating communication between a digital communication terminal connected to an IP network and an emergency call communication base connected to a PSTN network, wherein a connection means is provided. Receiving a first establishment request for requesting establishment of a session with the emergency call communication terminal from the analog communication terminal connected via the first communication request, and receiving the first establishment request by the first reception step. A communication step for communicating with the emergency call communication base to establish a session between the emergency call communication base and the analog communication terminal via the PSTN network, and from the digital communication terminal , A second reception step for receiving a second establishment request for requesting establishment of a session with the emergency call communication terminal via the IP network, and the second reception step. If the establishment request has been received, and a reject reject step to establish a session between the emergency call communication platform. According to the 2nd aspect, there can exist an effect similar to a 1st aspect.

  The communication control program according to the third aspect of the present invention receives a first establishment request for requesting establishment of a session with an emergency call communication base connected to a PSTN network from an analog communication terminal connected via a connection means. A first receiving step for establishing a session between the emergency call communication stand and the analog communication terminal via the PSTN network when the first establishment request is received by the first receiving step. A second step of receiving a second establishment request for requesting establishment of a session with the emergency call communication base from a communication step for communicating with the emergency call communication base and a digital communication terminal connected to an IP network. A step of rejecting establishment of a session with the emergency call communication terminal when the second establishment request is received in the second reception step. To be executed by a computer. According to the 3rd aspect, there can exist an effect similar to a 1st aspect.

1 is a diagram showing an overview of a communication system 1 and functional blocks of a communication control device 11. FIG. 2 is a block diagram showing an electrical configuration of a communication control device 11. FIG. It is a flowchart which shows a 1st IP control process. It is a flowchart which shows a 1st analog control process. It is a flowchart which shows a 2nd analog control process. It is a flowchart which shows a PSTN control process.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. These drawings are used to explain technical features that can be adopted by the present invention. The configuration of the apparatus, the flowcharts of various processes, and the like that are described are not intended to be limited to only that, but are merely illustrative examples.

  The communication system 1 will be described with reference to FIG. The communication system 1 includes a communication control device 11, an emergency call communication stand 12, a digital communication terminal 13, and analog communication terminals 14 and 18. The emergency call communication stand 12 is connected to a Public Switched Telephone Networks (PSTN) network 15. The emergency call communication stand 12 is a reception stand that accepts an emergency call (110, 119, 118, etc.) via the PSTN network 15. The emergency call communication stand 12 is installed in the police agency (110), the fire engine (119), the maritime security agency (118), and the like. The digital communication terminal 13 is connected to an Internet Protocol (IP) network 16. The digital communication terminal 13 is a communication terminal that provides a call service to a user by performing digital communication. The digital communication terminal 13 performs communication based on Session Initiation Protocol (SIP) with the communication control apparatus 11 described later. As the digital communication terminal 13, a well-known IP phone can be used. The analog communication terminal 14 is directly connected to the communication control device 11 described later via a modular cable 17. The analog communication terminal 18 is connected to the PSTN network 15. The analog communication terminals 14 and 18 are communication terminals that provide a call service to the user by performing analog communication. As the analog communication terminals 14 and 18, a well-known analog telephone can be used.

  The communication control device 11 is connected to the PSTN 15 network and the IP network 16. The communication control device 11 is connected to the analog communication terminal 14 via a modular cable 17. The communication control device 11 includes an emergency call communication base 12 and an analog communication terminal 18 connected via a PSTN network 15, a digital communication terminal 13 connected via an IP network 16, and analog communication connected via a modular cable 17. A process that mediates communication between the terminals 18 is executed.

  Functional blocks provided in the communication control device 11 will be described. The communication control device 11 includes a PSTN control unit 111, an analog control unit 112, a first IP control unit 113, and a second IP control unit 114 as functional blocks. Each functional block indicates a basic unit of processing executed in the CPU 21 (see FIG. 2) of the communication control device 11. An outline of the operation of the communication control device 11 realized by each functional block will be described below.

  The first IP control unit 113 receives a communication addressed to the emergency call communication terminal 12 and the analog communication terminal 18 connected to the PSTN network 15 from the digital communication terminal 13 connected to the IP network 16 and functions as a mediator for communication. It is. The first IP control unit 113 implements the following functions.

  Assume that the communication control apparatus 11 receives an INVITE requesting establishment of a session with the analog communication terminal 18 from the digital communication terminal 13 via the IP network 16. The first IP control unit 113 defines the PSTN network 15 as a destination Session Initiation Protocol User Agent (SIP UA). The first IP control unit 113 performs establishment communication for establishing a session via the IP network 16 between the defined SIP UA of the destination and the digital communication terminal 13. Next, the first IP control unit 113 requests the PSTN control unit 111 to execute establishment communication in order to establish a session via the PSTN network 15 with the analog communication terminal 18. In response to the request, the PSTN control unit 111 executes establishment communication for establishing a session with the analog communication terminal 18. As a result, a session is established between the digital communication terminal 13 and the analog communication terminal 18, and a call can be made.

  On the other hand, it is assumed that the communication control device 11 receives an INVITE requesting establishment of a session with the emergency call communication terminal 12 from the digital communication terminal 13 via the IP network 16. Unlike the case described above, the first IP control unit 113 does not execute establishment communication for establishing a session, and rejects establishment of a session between the digital communication terminal 13 and the emergency call communication stand 12. The reason is as follows. The digital communication terminal 13 is connected to the IP network 16 and its specific location is indefinite. When the digital communication terminal 13 is connected to the IP network 16 from a position far away from the communication control device 11, the communication control device 11 is connected to the emergency call communication stand located away from the communication terminal 13 that is the source of the INVITE. 12 is established. In such a case, when the user makes an emergency call using the digital communication terminal 13, the user is connected to the emergency call communication stand 12 at a remote location. As a result, the operator of the emergency call communication base 12 is a report from the user of the digital communication terminal 13 located far from the emergency call communication base, and therefore there is a possibility that this report cannot be appropriately dealt with. Therefore, when receiving an emergency call from the digital communication terminal 13, the communication control device 11 prevents the above-described adverse effects by refusing to establish a session between the digital communication terminal 13 and the emergency call communication stand 12.

  In addition to the above-described functions, the first IP control unit 113 establishes a process for establishing a session between the analog communication terminal 18 and the analog communication terminal 14 in response to a request from the analog communication terminal 18. It also executes processing to disconnect the session.

  The analog control unit 112 receives a communication addressed to the emergency call communication terminal 12 and the analog communication terminal 18 connected to the PSTN network 15 from the analog communication terminal 14 connected via the modular cable 17 and mediates communication. It is. The analog control unit 112 realizes the following functions.

  It is assumed that the communication control device 11 receives an establishment request for requesting establishment of a session with the analog communication terminal 18 from the analog communication terminal 14 via the modular cable 17. The analog control unit 112 defines the analog communication terminal 14 as a transmission source SIP UA. The analog control unit 112 requests the first IP control unit 113 via the second IP control unit 114 to establish a session with the analog communication terminal 18. Specifically, the analog control unit 112 virtually transmits the INVITE from the defined SIP UA of the transmission source to the first IP control unit 113 via the second IP control unit 114, so that the first IP control unit 113 is requested to establish a session. Upon receiving the request, the first IP control unit 113 defines the PSTN network 15 as a destination SIP UA. The first IP control unit 113 establishes a session between the source SIP UA (analog communication terminal 14) and the destination SIP UA (PSTN network 15). Next, the first IP control unit 113 requests the PSTN control unit 111 to execute establishment communication in order to establish a session via the PSTN network 15 with the analog communication terminal 18. The PSTN control unit 111 that has received the request executes establishment communication for establishing a session with the analog communication terminal 18. As a result, a session is established between the analog communication terminals 14 and 18, and a call can be made.

  It is assumed that the communication control device 11 receives an establishment request for requesting establishment of a session with the emergency call communication stand 12 from the analog communication terminal 14 via the modular cable 17. The analog control unit 112 requests the PSTN control unit 111 to execute establishment communication in order to establish a session via the PSTN network 15 with the emergency call communication base 12. Unlike the above-described case where the establishment request for requesting establishment of a session between the analog communication terminal 14 and the analog communication terminal 18 is received, the PSTN control is not performed via the first IP control unit 113 and the second IP control unit 114. The unit 111 is directly requested to execute the established communication. In response to the request, the PSTN control unit 111 executes establishment communication for establishing a session with the emergency call communication stand 12. As a result, a session is established between the analog communication terminal 14 and the emergency call communication stand 12. The user of the analog communication terminal 14 can make an emergency call to the emergency call communication stand 12. Here, the analog communication terminal 14 is directly connected to the communication control device 11 via the modular cable 17, and the specific location is clear. For this reason, the communication control device 11 establishes a session between the emergency call communication stand 12 installed in the vicinity of the communication control device 11 and the analog communication terminal 14, thereby making an emergency call from the analog communication terminal 14 an analog call. The call can be transferred to the emergency call communication stand 12 installed at a position close to the communication terminal 14. As a result, the operator of the emergency call communication stand 12 can appropriately cope with the emergency call transmitted from the analog communication terminal 14.

  In addition to the above-described functions, the analog control unit 112 establishes communication for establishing a session between the analog communication terminal 14 and the digital communication terminal 13 in response to a request from the analog communication terminal 14 or the digital communication terminal 13. Is executed via the second IP control unit 114. As a result, a call can be made between the analog communication terminal 14 and the digital communication terminal 13. In response to a request from the analog communication terminal 18, the analog control unit 112 performs establishment communication for establishing a session between the analog communication terminals 14 and 18. As a result, a call can be made between the analog communication terminals 14 and 18.

  The PSTN control unit 111 is established for establishing a session via the PSTN network 15 between the emergency call communication base 12 and the analog communication terminal 18 in response to requests from the analog control unit 112 and the first IP control unit 113. It is a functional block that executes communication. Further, the PSTN control unit 111 performs control so as to realize a hold function and a reverse function provided by the emergency call communication stand 12. The hold function is established even when a session between the emergency call communication stand 12 and the analog communication terminal 14 is established and an emergency call is received from the analog communication terminal 14 or when the session is requested to be disconnected from the analog communication terminal 14 side. This is a function for maintaining a session unless a session disconnection is requested from the emergency call communication stand 12 side. The reverse communication function is a function for calling the analog communication terminal 14 from the emergency call communication base 12 through the maintained session. Note that the hold function and the reverse communication function are functions that the well-known emergency call communication stand 12 normally has.

  The second IP control unit 114 is a functional block for mediating communication between the digital communication terminal 13 connected to the IP network 16 and the analog communication terminal 14 connected via the modular cable 17. In response to a request from the digital communication terminal 13 or the analog communication terminal 14, the second IP control unit 114 executes establishment communication for establishing a session between the analog communication terminal 14 and the digital communication terminal 13. The second IP control unit 114 also mediates communication between the analog communication terminal 18 connected to the PSTN network 15 and the analog communication terminal 14 connected via the modular cable 17.

  The electrical configuration of the communication control device 11 will be described with reference to FIG. The communication control device 11 includes a CPU 21 that controls the communication control device 11. The CPU 21 includes a ROM 22, a RAM 23, a FROM 24, a CODEC 25, 26, a Foreign eXchange Office interface (hereinafter referred to as FXO I / F) 27, a Foreign eXchange Station interface (hereinafter referred to as FXS I / F) 28, and an Ethernet (registered trademark). ) Interface (hereinafter referred to as Ethernet I / F) 29 is electrically connected. The ROM 22 is a rewritable nonvolatile memory. The ROM 22 stores a boot program, BIOS, OS, and the like. The RAM 23 stores a timer, a counter, and temporary data. The FROM 24 stores a control program for the CPU 21. The CODECs 25 and 26 are devices for encoding and decoding audio signals. The FXO I / F 27 is an interface for communicating with the emergency call communication stand 12 and the analog communication terminal 18 via the PSTN network 15. The FXS I / F 28 is an interface for connecting to the analog communication terminal 14 via the modular cable 17 and performing communication. The Ethernet I / F 29 is an interface for communicating with the digital communication terminal 13 via the IP network 16.

  Processing executed by the communication control device 11 will be described with reference to FIGS. 3 to 6. The first IP control process (see FIG. 3), the first analog control process (see FIG. 4), the second analog control process (see FIG. 5), and the PSTN control process (see FIG. 6) are stored in the FROM 24. The CPU 21 of the communication control device 11 executes according to the communication control program. When the communication control device 11 is powered on, the CPU 21 starts the first IP control process, the first analog control process, and the PSTN control process. Further, the CPU 21 starts the second analog control process when the emergency call communication stand 12, the analog communication terminal 18, and the session between the digital communication terminal 13 and the analog communication terminal 14 are established. The CPU 21 can execute each process in parallel.

  The CPU 21 realizes the function of the first IP control unit 113 (see FIG. 1) by executing the first IP control process. CPU21 implement | achieves the function of the analog control part 112 (refer FIG. 1) and the 2nd IP control part 114 (refer FIG. 1) by performing a 1st analog control process and a 2nd analog control process. The CPU 21 implements the function of the PSTN control unit 111 (see FIG. 1) by executing the PSTN control process.

  The first IP control process will be described with reference to FIG. First, the CPU 21 determines whether the power source of the communication control device 11 is turned off (S11). When the power supply of the communication control device 11 is turned off (S11: YES), the first IP control process ends. On the other hand, when the power supply of the communication control device 11 is not turned off (S11: NO), the CPU 21 requests the establishment of a session with the emergency call communication stand 12 or the analog communication terminal 18 connected to the PSTN network 15. Is determined (S13).

  The INVITE is received from the digital communication terminal 13 or virtually received from the SIP UA of the analog communication terminal 14. The INVITE received from the digital communication terminal 13 is a signal requesting establishment of a session with the emergency call communication stand 12, and a case requesting establishment of a session with the analog communication terminal 18. There is. On the other hand, the INVITE virtually received from the SIP UA of the analog communication terminal 14 is only a signal requesting establishment of a session with the analog communication terminal 18. When the session between the analog communication terminal 14 and the emergency call communication stand 12 is established, the process is executed through the first analog control process (see FIG. 4) and the PSTN control process (see FIG. 6). is there. If the CPU 21 has not received INVITE (S13: NO), the process returns to S11.

  When the INVITE is received (S13: YES), the CPU 21 determines whether the PSTN network 15 is in use (S15). If another session via the PSTN network 15 has already been established, a new session cannot be established via the PSTN network 15. In this case, the CPU 21 determines that the PSTN network 15 is in use (S15: YES). CPU21 refuses establishment of a session by transmitting BUSY with respect to the digital communication terminal 13 (S21). The process returns to S11.

  When the PSTN network 15 is not in use (S15: NO), the CPU 21 has received an INVITE from the digital communication terminal 13 in S13, and is an INVITE requesting establishment of a session with the emergency call communication terminal 12. It is determined whether there is (S17). In the case of an INVITE requesting establishment of a session with the emergency call communication terminal 12 (S17: YES), the CPU 21 determines that the establishment of the session between the digital communication terminal 13 and the emergency call communication terminal 12 is rejected. Then, BUSY is transmitted to the digital communication terminal 13 (S21). Accordingly, when the user makes an emergency call using the digital communication terminal 13, the digital communication terminal 13 is not connected to the emergency call communication stand 12. The process returns to S11.

  When the INVITE received in S13 is a signal requesting establishment of a session with the analog communication terminal 18 (S17: NO), the digital communication terminal 13 or the analog communication terminal 14 is in communication with the analog communication terminal 18. You are requesting the establishment of a session. Hereinafter, of the digital communication terminal 13 or the analog communication terminal 14, a communication terminal that requests establishment of a session with the analog communication terminal 18 is referred to as a request terminal. The CPU 21 requests the PSTN control process (see FIG. 6) to execute establishment communication in order to establish a session between the requesting terminal and the analog communication terminal 18 (S19). The requested establishment communication is executed in S85 (see FIG. 6) of the PSTN control process (see FIG. 6). Details will be described later. Thereby, a session between the requesting terminal and the analog communication terminal 18 is established. It becomes possible to execute a call between the requesting terminal and the analog communication terminal 18.

  CPU21 judges whether the digital communication terminal 13 went on-hook, when the request | requirement terminal with which the session between the analog communication terminals 18 was established is the digital communication terminal 13 (S23). If the digital communication terminal 13 is not on-hook (S23: NO), the process proceeds to S27. On the other hand, when the digital communication terminal 13 goes on-hook (S23: YES), the user of the digital communication terminal 13 tries to terminate the call by disconnecting the session with the analog communication terminal 18. In order to disconnect the session established between the digital communication terminal 13 and the analog communication terminal 18, the CPU 21 requests the PSTN control process (see FIG. 6) to execute the disconnect communication (S25). The requested disconnection communication is executed in S91 (see FIG. 6) of the PSTN control process (see FIG. 6). The session between the digital communication terminal 13 and the analog communication terminal 18 is disconnected. The process returns to S11.

  Whether the CPU 21 is requested to execute disconnection communication for disconnecting the session established between the analog communication terminal 18 and the requesting terminal in S103 (see FIG. 6) of the PSTN control process (see FIG. 6). Determination is made (S27). When the request for execution of the disconnect communication is not made (S27: NO), the process returns to S23. On the other hand, when the execution of the disconnect communication is requested (S27: YES), the CPU 21 performs disconnect communication with the request terminal for disconnecting the session established between the analog communication terminal 18 and the request terminal. (S29). Specifically, the CPU 21 transmits a disconnection request to the requesting terminal. The session between the analog communication terminal 18 and the requesting terminal is disconnected. The process returns to S11.

  The first analog control process will be described with reference to FIG. First, the CPU 21 determines whether the power source of the communication control device 11 is turned off (S31). When the power supply of the communication control device 11 is turned off (S31: YES), the first analog control process ends. On the other hand, when the power supply of the communication control device 11 is not turned off (S31: NO), the CPU 21 connects the emergency call communication stand 12 or the analog communication terminal connected to the PSTN network 15 from the analog communication terminal 14 via the modular cable 17. It is determined whether an establishment request for requesting establishment of a session with 18 has been received (S33). In practice, an establishment request for requesting establishment of a session with the digital communication terminal 13 may be received from the analog communication terminal 14, but this case is omitted below. If the establishment request has not been received (S33: NO), the process returns to S31.

  When the establishment request is received from the analog communication terminal 14 (S33: YES), the CPU 21 determines whether the establishment request received in S33 is a signal for requesting establishment of a session with the emergency call communication base 12. (S37). When the signal is a signal requesting establishment of a session with the emergency call communication terminal 12 (S37: YES), the CPU 21 establishes a session between the emergency call communication terminal 12 and the analog communication terminal 14 in order to establish a session. The control process (see FIG. 6) is requested to execute established communication (S39). The requested establishment communication is executed in S85 (see FIG. 6) of the PSTN control process (see FIG. 6). Details will be described later. The process returns to S31.

  On the other hand, when the establishment request received in S33 is not a signal requesting establishment of a session with the emergency call communication stand 12 (S37: NO), a signal requesting establishment of a session with the analog communication terminal 18 There will be. In order to establish a session between the analog communication terminals 14 and 18, the CPU 21 requests the first IP control process (see FIG. 3) to execute establishment communication (S41). Specifically, the CPU 21 is an INVITE requesting establishment of a session with the analog communication terminal 18, and the INVITE virtually transmitted from the SIP UA of the analog communication terminal 14 is the first IP control process ( An INVITE reception event is issued so as to be received in S13 (see FIG. 3) of FIG. In the first IP control process, a process of receiving an INVITE virtually transmitted from the SIP UA of the analog communication terminal 14 is executed based on the issued reception event. Note that the above-described processing of receiving INVITE requesting establishment of a session with the analog communication terminal 18 by the first IP control processing corresponds to the function of the second IP control unit 114 (see FIG. 1). The process returns to S31.

  The second analog control process will be described with reference to FIG. When the session between the emergency call communication stand 12, the analog communication terminal 18, and the digital communication terminal 13 and the analog communication terminal 14 is established, the CPU 21 starts the second analog control process. First, the CPU 21 determines whether the analog communication terminal 14 has been on-hook (S51). The CPU 21 determines that the analog communication terminal 14 is on-hook when receiving a disconnection request transmitted from the analog communication terminal 14 when the analog communication terminal 14 is on-hook. On the other hand, if the CPU 21 does not receive a disconnection request from the analog communication terminal 14, it determines that the analog communication terminal 14 is not on-hook. When the analog communication terminal 14 is not on-hook (S51: NO), the CPU 21 performs the communication between the emergency call communication stand 12 and the analog communication terminal 14 in S101 (see FIG. 6) of the PSTN control process (see FIG. 6). A request for execution of disconnection communication for disconnecting the session in the established state has been made, or disconnection for disconnecting the session in the state established between the analog communication terminals 14 and 18 in S103 (see FIG. 6). It is determined whether communication execution is requested (S73). When the request for execution of the disconnect communication is not made (S73: NO), the process returns to S51. On the other hand, when a request for execution of disconnection communication is made (S73: YES), the CPU 21 executes disconnection communication with the analog communication terminal 14 for disconnecting the established session (S75). Specifically, the CPU 21 transmits a disconnection request to the analog communication terminal 14. The session between the emergency call communication stand 12 or the analog communication terminal 18 and the analog communication terminal 14 is disconnected. The process returns to S51.

  On the other hand, when the analog communication terminal 14 is on-hook (S51: YES), the CPU 21 determines whether a session is established between the emergency call communication stand 12 and the analog communication terminal 14 (S53). When a session is not established between the emergency call communication stand 12 and the analog communication terminal 14 (S53: NO). A session is established between the analog communication terminals 14 and 18. The user of the analog communication terminal 14 is going to end the call by disconnecting the session with the analog communication terminal 18. The CPU 21 requests the PSTN control process (see FIG. 6) to execute the disconnect communication in order to disconnect the established session (S55). The requested disconnection communication is executed in S91 (see FIG. 6) of the PSTN control process (see FIG. 6). The session between the analog communication terminals 14 and 18 is disconnected. The second analog control process ends.

  On the other hand, when the session is established between the emergency call communication stand 12 and the analog communication terminal 14 (S53: YES), the CPU 21 tries to terminate the call by the user of the analog communication terminal 14 disconnecting the session. In contrast, the session between the emergency call communication stand 12 and the analog communication terminal 14 is maintained without being disconnected (S56). Thereby, the emergency call communication stand 12 can easily execute reverse communication through the maintained session. That is, the emergency call communication stand 12 does not need to re-establish a session in order to execute reverse communication.

  The CPU 21 starts measuring the elapsed time since the analog communication terminal 14 has been on-hook (S57). The CPU 21 notifies the PSTN control processing (S95) that the reverse call is executed from the emergency call communication base 12 to the analog communication terminal 14 through the session between the emergency call communication base 12 and the analog communication terminal 14. , See FIG. 6) (S59). When the notification that the reverse message has been executed is received (S59: YES), the CPU 21 sounds the ringing sound of the analog communication terminal 14 to notify the user that the reverse message has been executed. An incoming call notification is transmitted to the terminal 14 (S63). The process proceeds to S65.

  When receiving an incoming call notification from the communication control device 11, the analog communication terminal 14 rings a ringing tone and notifies the user that the reverse call has been executed from the emergency call communication stand 12. Since the session between the emergency call communication stand 12 and the analog communication terminal 14 is maintained in an established state (S56), the user of the analog communication terminal 14 goes off-hook to the analog communication terminal 14 according to the ringing tone. Thus, the telephone call can be resumed with the emergency call communication terminal 12 according to the reverse communication executed in the emergency call communication terminal 12.

  On the other hand, when the notification that the reverse communication has been executed is not received (S59: NO), the CPU 21 determines whether or not a predetermined time has elapsed since the analog communication terminal 14 was on-hooked by measuring the elapsed time started in S57. A determination is made based on the result (S61). If the elapsed time is less than the predetermined time (S61: NO), the process proceeds to S65. On the other hand, when the elapsed time is equal to or longer than the predetermined time (S61: YES), the CPU 21 notifies the analog communication terminal 14 of the incoming call in order to sound the ringing sound of the analog communication terminal 14 and notify the user. Is transmitted (S63).

  When receiving an incoming call notification from the communication control device 11, the analog communication terminal 14 notifies the user by ringing a ringing tone. The user can resume the call with the emergency call communication stand 12 by off-hooking the analog communication terminal 14 according to the ringing tone. As described above, when the emergency call communication stand 12 does not execute reverse communication for a predetermined time or more via the maintained session after the analog communication terminal 14 is on-hook, the communication control device 11 and the analog communication terminal 12 14 can be prompted to resume communication with the user 14. The process proceeds to S65.

  The CPU 21 determines whether the analog communication terminal 14 is off-hook (S65). When the analog communication terminal 14 goes off-hook (S65: YES), the emergency call communication table 12 and the analog communication terminal 14 are connected via a session maintained between the emergency call communication table 12 and the analog communication terminal 14. The call is resumed (S67). The process returns to S51.

  On the other hand, when the analog communication terminal 14 does not go off-hook (S65: NO), the CPU 21 determines whether the emergency call communication base 12 and the analog communication terminal 14 are in S101 (see FIG. 6) of the PSTN control process (see FIG. 6). It is determined whether or not a disconnection communication request for disconnecting the established session is requested (S69). When the request for execution of the disconnect communication is not made (S69: NO), the process returns to S59. On the other hand, when a request for execution of disconnection communication is made (S69: YES), the CPU 21 executes disconnection communication with the analog communication terminal 14 for disconnecting the established session (S71). Specifically, the CPU 21 transmits a disconnection request to the analog communication terminal 14. The session between the emergency call communication stand 12 and the analog communication terminal 14 is disconnected. The second analog control process ends.

  The PSTN control process will be described with reference to FIG. First, the CPU 21 determines whether the power source of the communication control device 11 is turned off (S81). When the power supply of the communication control device 11 is turned off (S81: YES), the PSTN control process ends. On the other hand, when the power of the communication control device 11 is not turned off (S81: NO), execution of establishment communication for establishing a session with the emergency call communication base 12 or the analog communication terminal 18 connected to the PSTN network 15 is executed. Is determined (S83). There are the following two cases where execution of establishment communication is required. In the first case, the establishment for establishing a session between the digital communication terminal 13 or the analog communication terminal 14 and the analog communication terminal 18 in S19 (see FIG. 3) of the first IP control process (see FIG. 3). This is a case where execution of communication is requested. In the second case, in S39 (see FIG. 4) of the first analog control process (see FIG. 4), execution of establishment communication for establishing a session between the analog communication terminal 14 and the emergency call communication stand 12 is performed. This is the case when required. If none of the cases apply (S83: NO), the process returns to S81.

  On the other hand, when execution of establishment communication for establishing a session is requested (S83: YES), the CPU 21 in the first case described above, the digital communication terminal 13 or the analog communication terminal 14 and the analog communication terminal 18 The establishment communication for establishing a session with the analog communication terminal 18 is executed via the PSTN network 15 (S85). As a result, a session is established (S85) and a call can be made. On the other hand, in the second case described above, the CPU 21 performs establishment communication for establishing a session between the communication control device 11 and the emergency call communication base 12 with the emergency call communication base 12 via the PSTN network 15. (S85). As a result, a session is established (S85) and a call can be made.

  The CPU 21 determines whether or not execution of disconnection communication for disconnecting the session established in S85 is requested (S87). There are two cases where the execution of the disconnect communication is required. In the first case, it is requested to execute disconnect communication for disconnecting the session between the digital communication terminal 13 and the analog communication terminal 18 in S25 (see FIG. 3) of the first IP control process (see FIG. 3). This is the case. The second case is a case where execution of disconnection communication for disconnecting the session between the analog communication terminals 14 and 18 is requested in S55 (see FIG. 5) of the second analog control process (see FIG. 5). . When the analog communication terminal 14 goes on-hook with the session established between the emergency call communication stand 12 and the analog communication terminal 14 (see S51, FIG. 5), the second analog control process (FIG. 5) is performed. In step S56 (see FIG. 5), the session being established is maintained, and the PSTN control process is not requested to execute the disconnect communication.

  When execution of disconnection communication is requested (S87: YES), the CPU 21 executes disconnection communication with the analog communication terminal 18 to disconnect the established session (S91). Specifically, the CPU 21 transmits a disconnection request to the analog communication terminal 18. The PSTN network 15 is opened (S91). The process returns to S81.

  On the other hand, when the execution of the disconnect communication is not requested (S87: NO), the CPU 21 determines whether or not the reverse communication executed in the emergency call communication base 12 is detected (S93). If no reverse communication is detected (S93: NO), the process proceeds to S97. When the reverse communication is detected (S93: YES), the CPU 21 notifies the second analog control process (see FIG. 5) that the reverse communication has been executed in the emergency call communication base 12 (S95). In the second analog control process (see FIG. 5), when a notification that reverse running has been executed is received, an incoming call notification is transmitted to the analog communication terminal 14 (see S63, FIG. 5). The process proceeds to S97.

  CPU21 judges whether the busy tone (BT) output from the emergency call communication stand 12 or the analog communication terminal 18 was detected (S97). When the busy tone is not detected from the emergency call communication stand 12 or the analog communication terminal 18 (S97: NO), the CPU 21 returns the process to S87. On the other hand, when a busy tone is detected from the emergency call communication base 12 or the analog communication terminal 18 (S97: YES), the emergency call communication base 12 or the analog communication terminal 18 that is transmitting the busy tone is on-hook and is being established. You are trying to disconnect the session.

  The CPU 21 determines whether a busy tone is detected from the emergency call communication board 12 (S99). When the busy tone is detected from the emergency call communication base 12 (S99: YES), the CPU 21 performs the second analog control in order to disconnect the session established between the emergency call communication base 12 and the analog communication terminal 14. The execution of disconnection communication is requested for the process (see FIG. 5) (S101). The requested disconnection communication is executed in S71 and S75 (see FIG. 6) of the second analog control process (see FIG. 5). The PSTN network 15 is opened (S105). The process returns to S81. As described above, when the process for terminating the communication with the analog communication terminal 14 is executed in the emergency call communication base 12, the communication control device 11 is connected between the emergency call communication base 12 and the analog communication terminal 14. The session can be terminated.

  On the other hand, when the busy tone is not detected from the emergency call communication stand 12 (S99: NO), the busy tone is detected from the analog communication terminal 18. In order to disconnect the session established between the analog communication terminals 14 and 18, the CPU 21 requests the second analog control process (see FIG. 5) to execute disconnect communication (S103). The requested disconnection communication is executed in S71 and S75 (see FIG. 6) of the second analog control process (see FIG. 5). The PSTN network 15 is opened (S105). The process returns to S81.

  As described above, the communication control apparatus 11 is a well-known device that mediates communication between the PSTN network 15 and the IP network 16, for example, a VoIP gateway for directly connecting to the analog communication terminal 14 with the FXS I / F 28. It has the composition provided with. Since the analog communication terminal 14 is directly connected to the communication control device 11, the analog communication terminal 14 is disposed in the vicinity of the communication control device 11. It is assumed that the user makes an emergency call using the analog communication terminal 14. The communication control device 11 executes establishment communication for establishing a session between the emergency call communication stand 12 connected via the PSTN network 15 and the analog communication terminal 14. The emergency call made using the analog communication terminal 14 is connected to the emergency call communication stand 12 arranged in the vicinity. Therefore, the user of the analog communication terminal 14 can make a call with the appropriate emergency call communication stand 12.

  On the other hand, it is assumed that the user makes an emergency call using the digital communication terminal 13. Unlike the analog communication terminal 14, the location of the digital communication terminal 13 is indefinite, and the digital communication terminal may be located away from the emergency call communication stand 12. Therefore, the communication control device 11 does not establish a session between the emergency call communication stand 12 and the digital communication terminal 13. In this way, the communication control device 11 rejects the establishment of a session between the digital communication terminal 13 and the emergency call communication table 12 that may be arranged apart from each other, thereby preventing an inappropriate emergency call communication table. Communication between the terminal 12 and the digital communication terminal 13 can be suppressed.

  The FXS I / F 28 corresponds to the “connecting means” of the present invention. The CPU 21 that performs the process of S33 corresponds to the “first receiving means” of the present invention. The CPU 21 that performs the process of S85 corresponds to the “communication means” of the present invention. The CPU 21 that performs the process of S13 corresponds to the “second receiving means” of the present invention. The CPU 21 that performs the process of S21 corresponds to the “rejection means” of the present invention. The CPU 21 that performs the process of S51 corresponds to the “third receiving means” of the present invention. The CPU 21 that performs the process of S56 corresponds to the “maintaining means” of the present invention. The CPU 21 that performs the process of S93 corresponds to the “determination means” of the present invention. The CPU 21 that performs the process of S63 corresponds to the “first transmission unit” and “second transmission unit” of the present invention. The CPU 21 that performs the process of S97 corresponds to the “fourth receiving means” of the present invention. The CPU 21 that performs the processes of S71 and S75 corresponds to the “third transmission unit” of the present invention. The process of S33 corresponds to the “first reception step” of the present invention. The process of S85 corresponds to the “communication step” of the present invention. The process of S13 corresponds to the “second reception step” of the present invention. The process of S21 corresponds to the “rejection step” of the present invention.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. In the above-described embodiment, the communication control device 11 and the analog communication terminal 13 are connected by the modular cable 17. The communication control device 11 and the analog communication terminal 13 may be connected by another communication medium. For example, the analog communication terminal 14 may be connected to the communication control apparatus 11 via a local PSTN network. Two or more analog communication terminals 14 that are directly connected to the communication control apparatus 11 may be used. In the above-described embodiment, when the session between the analog communication terminal 14 and the emergency call communication stand 12 is established and then the analog communication terminal 14 is on-hook and the session is requested to be disconnected, The session with the call communication board 12 was maintained. When the analog communication terminal 14 goes on hook, the communication control device 11 may disconnect the session between the analog communication terminal 14 and the emergency call communication stand 12. In the above-described embodiment, when the emergency call communication base 12 executes reverse communication via a session maintained between the analog communication terminal 14 and the emergency call communication base 12, the communication control device 11 is connected to the analog communication terminal 14. An incoming notification was sent to. Instead of notifying the incoming call, the communication control device 11 may notify the user of the analog communication terminal 14 that the reverse communication has been executed by another notification method. For example, the user of the analog communication terminal 14 may be notified directly that the reverse communication has been executed by driving a speaker or LED provided in the communication control device 11. In the above-described embodiment, when the analog communication terminal 14 is on-hook in a state where the session between the analog communication terminal 14 and the emergency call communication stand 12 is established, Even when the reverse call is not executed by the emergency call communication stand 12, the incoming call notification is transmitted to the analog communication terminal. The communication control device 11 may transmit a warning signal to the emergency call communication stand 12 when a predetermined time has elapsed, and prompt the execution of reverse communication. In the above-described embodiment, when a busy tone is detected from the emergency call communication base 12 in a state where a session between the analog communication terminal 14 and the emergency call communication base 12 is established, the analog communication terminal 14 and the emergency call communication base 12 12 was disconnected from the session. For example, the emergency call communication stand 12 may transmit a predetermined tone signal for disconnecting the session through the session in a connected state. The communication control device 11 may disconnect the session between the analog communication terminal 14 and the emergency call communication stand 12 when a predetermined tone signal is received. The communication control device 11 may forcibly disconnect the session when the session between the analog communication terminal 14 and the emergency call communication stand 12 is continuously established for a predetermined time or more.

DESCRIPTION OF SYMBOLS 1 Communication system 11 Communication control apparatus 12 Emergency call communication stand 13 Digital communication terminal 14 Analog communication terminal 15 PSTN network 16 IP network 21 CPU
28 FXS I / F

Claims (7)

In a communication control device configured to be able to connect to the IP network and the PSTN network, mediating communication between a digital communication terminal connected to the IP network and an emergency call communication base connected to the PSTN network,
Connection means for connecting to the analog communication terminal to communicate with the analog communication terminal;
First receiving means for receiving a first establishment request for requesting establishment of a session with the emergency call communication terminal from the analog communication terminal connected by the connection means;
In order to establish a session between the emergency call communication stand and the analog communication terminal via the PSTN network when the first establishment request is received by the first receiving means, the emergency call communication stand A communication means for establishing communication with
A second receiving means for receiving, via the IP network, a second establishment request for requesting establishment of a session with the emergency call communication terminal from the digital communication terminal;
A communication control apparatus comprising: a rejection unit that rejects establishment of a session with the emergency call communication base when the second reception request is received by the second reception unit. Third reception for receiving a disconnection request for requesting disconnection of the session with the emergency call communication base from the analog communication terminal in a state where a session between the analog communication terminal and the emergency call communication base is established Means,
The maintenance means for maintaining a session between the analog communication terminal and the emergency call communication base when the disconnection request is received by the third receiving means. Communication control device. Determining means for determining whether or not a signal for the analog communication terminal is received from the emergency call communication base via a session maintained between the analog communication terminal and the emergency call communication base by the maintenance means; ,
First transmission means for transmitting an incoming call notification to a user of the analog communication terminal to the analog communication terminal when the determination means determines that a signal for the analog communication terminal is received from the emergency call communication stand; The communication control apparatus according to claim 2, further comprising:   Elapsed time from when it is determined by the determination means that a signal for the analog communication terminal is not received from the emergency call communication stand and the disconnection request is received from the analog communication terminal by the third reception means The communication control device according to claim 3, further comprising a second transmission unit configured to transmit an incoming call notification to a user of the analog communication terminal to the analog communication terminal when a predetermined time has elapsed. In a state where a session between the analog communication terminal and the emergency call communication stand is established, a fourth receiving means for receiving an end notification for notifying the end of a call from the emergency call communication stand;
In order to disconnect a session established between the analog communication terminal and the emergency call communication base when the end notification is received by the fourth receiving means, a session between the emergency call communication base and The communication control apparatus according to claim 1, further comprising a third transmission unit that transmits a disconnect request for requesting disconnection to the analog communication terminal. A communication control method for mediating communication between a digital communication terminal connected to an IP network and an emergency call communication base connected to a PSTN network,
A first reception step of receiving a first establishment request for requesting establishment of a session with the emergency call communication terminal from an analog communication terminal connected via a connection means;
In order to establish a session between the emergency call communication terminal and the analog communication terminal via the PSTN network when the first establishment request is received by the first reception step, the emergency call communication terminal A communication step for establishing communication with
A second receiving step of receiving, via the IP network, a second establishment request for requesting establishment of a session with the emergency call communication terminal from the digital communication terminal;
A communication control method comprising: a rejection step of rejecting establishment of a session with the emergency call communication terminal when the second establishment request is received in the second reception step. A first reception step of receiving a first establishment request for requesting establishment of a session with an emergency call communication terminal connected to a PSTN network from an analog communication terminal connected via a connection means;
In order to establish a session between the emergency call communication terminal and the analog communication terminal via the PSTN network when the first establishment request is received by the first reception step, the emergency call communication terminal A communication step for establishing communication with
A second receiving step of receiving a second establishment request for requesting establishment of a session with the emergency call communication terminal from a digital communication terminal connected to the IP network;
A communication control program for causing a computer to execute a rejection step of rejecting establishment of a session with the emergency call communication terminal when the second establishment request is received in the second reception step.

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