JP2008245077A - Communication control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication control system, such that even when a first communication control unit in operation between the first communication control unit and a second communication control unit which control a communication device for communication at a connection request from the communication device is stopped from operating to switch with the second communication control unit to operate, the communication device in communication will not be forcibly disconnected. <P>SOLUTION: A master IP exchange 3 in operation out of the master IP exchange 3 and a slave IP exchange 4, has: a call state detector 101, which detects a call state of an extension terminal 9; and a call information notifying unit 102 which notifies a line control unit 13 accommodating the extension terminal of call information corresponding to the call state, and a line control unit 13 has: a call information memory 6A which stores call information once detecting the call information of the extension terminal 9 from the master IP exchange; and a call information transfer unit 6B which notifies the slave IP exchange 4 which starts operating of the call information stored in the call information memory once detecting the master IP exchange 3 stopping operating. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a communication device such as an IP terminal, and a first communication control device such as a master IP switch and a slave IP switch that enable communication control of the communication device in response to a connection request for the communication device. And the second communication control device executes an operation related to communication control of the communication device, and the second communication control device operates the first communication control device. The present invention relates to a communication control system that starts operation related to communication control of the communication device when a stop is detected.

  As a conventional communication control system, for example, in a proposed switching device, the switching device is composed of a call control device (TM unit) that is an IP switching device and a circuit accommodating unit (TU unit), and the TU unit is a public switching network ( PSTN) and a plurality of analog terminals (telephones) and a plurality of LAN communication HUBs. The exchange is connected to the packet network through a router. The TM unit and the IP terminal are connected by a LAN, and a voice signal, mail and various information (telephone number, IP address, mail address, etc.) are transmitted by IP packets. The TU unit can connect an extension telephone or PSTN to a LAN or packet network as a packet network under the control of the IP call control unit (SC unit) of the TM unit. Thus, a hybrid system that can be connected to a packet network, supports a system configuration of only a packet network such as a LAN that does not use an analog telephone, and can use an analog telephone that combines a packet network and an existing public switching network. In addition, it is possible to easily cope with the minimum equipment (for example, see Patent Document 1).

  However, in the above-mentioned Patent Document 1, for example, when an IP exchange is operated with a large number of IP terminals accommodated in an IP call control unit (SC unit) as one base, when an IP exchange failure or a line failure occurs, There is a possibility that all the IP terminals in the base may not be operated, and there has been a problem that if the base is made a regional branch office or sales office, the business activities will be hindered.

  Thus, as another conventional communication control system, for example, in a proposed IP telephone system, an IP having a plurality of signal control devices for accommodating a plurality of IP terminals for each base via a line and performing call control The switch has a configuration including a switch and a backup switch that backs up an extension call of a plurality of IP terminals in the base in the event of an IP switch failure or a line failure.

  The main controller that controls the overall operation of the IP switch has a duplex structure, and is composed of an active main controller and a standby main controller. It is connected to a plurality of signal control devices via respective buses. The standby main control device constantly monitors the active main control device, and when the active main control device fails, switches from the standby system to the active system to control a plurality of signal control devices. Is.

In such a backup switch of the IP telephone system, if a communication check is performed with a signal control device that accommodates a plurality of IP terminals in the base and the communication check from the signal control device cannot be received, a failure of the IP switch Alternatively, it is determined that a line failure has occurred, and the standby state is switched to the operation state (for example, see Patent Document 2).
JP 2004-229112 A (see abstract and FIG. 1) Japanese Patent Laying-Open No. 2006-254096 (see abstract and FIG. 1)

  However, in the IP telephone system disclosed in Patent Document 2, when the operation is switched to the backup switch due to a failure of the IP switch in operation or a line failure while the IP terminal in the base is in a call, the IP terminal which is a communication device There was a problem that the call was forcibly disconnected.

  Therefore, the present invention has been made in view of the above points, and its object is to relate to a communication device in communication even if an operation stop is detected due to a failure of the first communication control device or a failure of the line. An object of the present invention is to provide a communication control system that can prevent forced disconnection of communication.

  To achieve the above object, a communication control system of the present invention includes a communication device, a first communication control device and a second communication control device that enable communication control of the communication device in response to a connection request for the communication device, The first communication control device executes an operation related to the communication control of the communication device, and the second communication control device detects the operation stop of the first communication control device, the communication device A communication control system that starts operation related to communication control of the first communication control device and the second communication control device, wherein a communication control device in operation is a communication state of the communication device related to the communication control Communication state detection means for detecting the communication state, and when the communication state detection means detects the communication state of the communication device, the communication state information notification for notifying the communication device of state information related to the communication state of the communication device And when the communication device detects the status information from the communication status information notification means, the communication device stores the status information, and detects the operation stop of the first communication control device. And means for notifying the second communication control device of the state information stored in the means.

  Therefore, according to the communication control system of the present invention, when the first communication control device in operation detects the communication state of the communication device related to the communication control, the state information related to the communication state of the communication device is transmitted to the communication device. When notifying the apparatus and detecting the status information from the operating first communication control apparatus, the communication apparatus stores the status information in a storage unit and detects the operation stop of the first communication control apparatus. Since the second communication control device is notified of the status information stored in the storage means, the second communication control device side detects operation stop of the first communication control device and starts operation. At this time, since the state information on the communication device side can be recognized, it is possible to prevent the forced disconnection of the communication related to the communication device in communication.

  The communication control system of the present invention starts operation related to communication control of a communication apparatus capable of communicating regardless of the operation stop when detecting the operation stop of the first communication control apparatus and the second communication control apparatus. Three communication control devices, and the status information notification means of the communication device notifies the third communication control device of the status information stored in the storage means when detecting the operation stop of the second communication control device I tried to do it.

  Therefore, according to the communication control system of the present invention, when the operation stop of the first communication control device and the second communication control device is detected, the operation related to the communication control of the communication device capable of communicating regardless of the operation stop is started. When the communication device detects the suspension of operation of the second communication control device, the communication device notifies the third communication control device of the status information stored in the storage means. Even when the first communication control device and the second communication control device are suspended, it is possible to avoid a situation in which all communication devices cannot communicate through the third communication control device.

  Further, in the communication control system of the present invention, the communication device includes a communication terminal and a communication terminal control device that controls the communication terminal, and the communication status information notifying unit of the communication control device in operation includes: When the communication status of the communication terminal in the communication device related to the communication control is detected by the communication status detection means, status information related to the communication status of the communication terminal is stored in the communication device accommodating the communication terminal. In addition to notifying the communication terminal control device, the communication terminal control device in the communication device, when detecting the status information related to the communication terminal from the communication status information notification means, stores this status information in the storage means, When the operation stop of the first communication control apparatus is detected, the second communication control apparatus is notified of the state information stored in the storage means through the state information notification means.

  Therefore, according to the communication control system of the present invention, when the communication control device in operation detects the communication state of the communication terminal in the communication device related to the communication control, the state information related to the communication state of the communication terminal To the communication terminal control device in the communication device that accommodates the communication terminal, and when the communication terminal control device in the communication device detects state information related to the communication terminal, the state information is stored in the storage device. When the operation stop of the first communication control device is detected and the second communication control device is notified of the status information being stored in the storage device, the second communication control device side When the operation stop of the first communication control device is detected and the operation is started, the status information on the communication device side can be recognized, thus preventing the forced disconnection of the communication related to the communication terminal in communication Rukoto can.

  Further, in the communication control system of the present invention, the communication device includes a communication terminal and a communication terminal control device that controls the communication terminal, and the communication status information notifying unit of the communication control device in operation includes: When the communication status of the communication terminal in the communication device related to the communication control is detected by the communication status detection means, status information related to the communication status of the communication terminal is stored in the communication device accommodating the communication terminal. In addition to notifying the communication terminal control device, the communication terminal control device in the communication device, when detecting the status information related to the communication terminal from the communication status information notification means, stores this status information in the storage means, When the operation stop of the second communication control apparatus is detected, the state information stored in the storage means is notified to the third communication control apparatus through the state information notification means.

  Therefore, according to the communication control system of the present invention, when the communication control device in operation detects the communication state of the communication terminal in the communication device related to the communication control, the state information related to the communication state of the communication terminal To the communication terminal control device in the communication device that accommodates the communication terminal, and when the communication terminal control device in the communication device detects state information related to the communication terminal, the state information is stored in the storage device. When the operation stop of the second communication control device is detected and the third communication control device is notified of the status information being stored in the storage device, the third communication control device side When the operation stop of the second communication control device is detected and the operation is started, the status information on the communication device side can be recognized, thus preventing the forced disconnection of the communication related to the communication terminal in communication Rukoto can.

  Further, the communication control system of the present invention is configured such that the second communication control device detects the suspension of operation of the first communication control device and starts operation related to communication control of the communication device. When the status information is detected from the status information notification means, the status information is managed, and when there is the communication terminal in the communication state, the communication disconnection request from the communication terminal is detected. The operation related to the communication control for the communication terminal was stopped.

  Therefore, according to the communication control system of the present invention, when the operation stop of the first communication control device is detected and the second communication control device starts operation related to communication control of the communication device, the communication control system When the status information is detected from the status information notification means of the control, the status information is managed, and when there is the communication terminal in communication state, a communication disconnection request from the communication terminal is detected. The operation related to the communication control for the communication terminal is stopped until the operation is switched from the first communication control device to the second communication control device during communication of the communication terminal. Can be maintained as it is without forcibly disconnecting the communication terminal.

  Further, the communication control system of the present invention is configured so that the third communication control device detects the suspension of operation of the second communication control device and starts operation related to communication control of the communication device. When the status information is detected from the status information notification means, the status information is managed, and when there is the communication terminal in the communication state, the communication disconnection request from the communication terminal is detected. The operation related to the communication control for the communication terminal was stopped.

  Therefore, according to the communication control system of the present invention, when the operation stop of the second communication control device is detected and the third communication control device starts operation related to the communication control of the communication device, the communication control system When the status information is detected from the status information notification means of the control, the status information is managed, and when there is the communication terminal in communication state, a communication disconnection request from the communication terminal is detected. The operation related to the communication control for the communication terminal is stopped until the communication terminal is switched from the second communication control device to the third communication control device during communication of the communication terminal. Can be maintained as it is without forcibly disconnecting the communication terminal.

  Further, the communication control system of the present invention is configured such that the second communication control device detects the suspension of operation of the first communication control device and starts operation related to communication control of the communication device. When the status information is detected from the status information notification means, the status information is managed, and if there is a communication terminal other than the communication status in the status information, the communication terminal is disconnected to control communication. Operation related to was started.

  Therefore, according to the communication control system of the present invention, when the operation stop of the first communication control device is detected and the second communication control device starts operation related to communication control of the communication device, the communication control system When the status information is detected from the status information notification means of control, the status information is managed, and if there is the communication terminal other than the communication status in the status information, the communication terminal is disconnected and communicated Since the operation related to the control is started, when the operation is switched from the first communication control device to the second communication control device in a communication state other than the communication state of the communication terminal, the communication terminal is compulsorily It is possible to avoid unnecessarily prolonging the state in which the communication terminal cannot communicate by disconnecting the communication terminal.

  Further, the communication control system of the present invention is configured so that the third communication control device detects the suspension of operation of the second communication control device and starts operation related to communication control of the communication device. When the status information is detected from the status information notification means, the status information is managed, and if there is a communication terminal other than the communication status in the status information, the communication terminal is disconnected to control communication. Operation related to was started.

  Therefore, according to the communication control system of the present invention, when the operation stop of the second communication control device is detected and the third communication control device starts operation related to the communication control of the communication device, the communication control system When the status information is detected from the status information notification means of control, the status information is managed, and if there is the communication terminal other than the communication status in the status information, the communication terminal is disconnected and communicated Since the operation related to the control is started, when the operation is switched from the second communication control device to the third communication control device in a communication state other than the communication state of the communication terminal, the communication terminal is compulsorily It is possible to avoid unnecessarily prolonging the state in which the communication terminal cannot communicate by disconnecting the communication terminal.

  In the communication control system of the present invention, the communication state information notifying unit of the communication control device in operation is in a communication state of the communication device related to the communication control detected by the communication state detecting unit. The communication device notifies the communication device of state information related to a minimum communication state necessary for disconnection of communication when the communication device is in communication and operation switching related to the communication control is performed.

  Therefore, according to the communication control system of the present invention, among the communication states of the communication device related to the communication control, the communication device communicates with the communication state of the communication device and the operation switching related to the communication control. Since the communication device is notified of state information related to the minimum communication state necessary for disconnection, the storage capacity of the storage unit of the communication device that stores the state information can be minimized. In addition, it is possible to greatly reduce the transmission time of status information related to operation switching.

  Further, in the communication control system of the present invention, when the communication state information notifying unit of the communication control device in operation detects the occurrence of communication control in each communication terminal in the communication device by the communication state detection unit, The status information of each communication terminal related to the occurrence of the communication control is notified to the communication device that accommodates the communication terminal, and the communication terminal control device is notified of each communication terminal notified by the communication status information notification means. State information is stored in the storage means.

  Therefore, according to the communication control system of the present invention, the communication state information notifying unit of the communication control device in operation detects the occurrence of communication control in each communication terminal in the communication device by the communication state detecting unit. Then, status information of each communication terminal involved in the generation of the communication control is notified to the communication device that accommodates the communication terminal, and the communication terminal control device notifies each communication notified by the communication status information notification means. Since the terminal status information is stored in the storage means, a uniform communication service can be provided for each communication terminal.

  According to the communication control system of the present invention configured as described above, when the first communication control device in operation detects the communication state of the communication device related to communication control, the state related to the communication state of the communication device Notifying the communication device of information, and when the communication device detects state information from the first communication control device in operation, stores the state information in a storage means, and operates the first communication control device. When the stop is detected, the second communication control device is notified of the status information stored in the storage means. Therefore, the second communication control device detects the stop of the operation of the first communication control device. When the operation is started, the state information on the communication device side can be recognized, so that it is possible to prevent the forced disconnection of the communication related to the communication device in communication.

  Hereinafter, a communication control system showing an embodiment of the present invention will be described based on the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a communication control system according to the present embodiment.

  In the communication control system of FIG. 1, an IP network 1 is a packet network of the Internet protocol, and is a telephone system disposed at a plurality of bases A, bases B corresponding to a predetermined area, and other bases not shown, that is, A network that forms a communication path between a terminal accommodated in a telephone system of a plurality of bases 2 and an IP terminal described later that is directly accommodated in the IP network 1.

  The master IP exchange 3 is an exchange that operates call control between terminals connected via a speech path formed by the IP network 1. The slave IP switch 4 replaces the master IP switch 3 when the master IP switch 3 is suspended due to a failure of the master IP switch 3 or a line failure between the IP network 1 and the master IP switch 3. 2 is an exchange that operates call control between terminals connected to each other via a communication path formed by the IP network 1.

  For example, the IP network 1 is a packet network arranged throughout Japan, the master IP exchange 3 is an exchange arranged in Tokyo, and the slave IP exchange 4 is an exchange arranged in Osaka. One base 2 is a telephone system located in the Kyushu area, the other one 2 is a telephone system located in the Shikoku area, and the bases not shown are the China area, the Kansai area, the Chubu area, and the Koshinetsu area, respectively. , Telephone systems located in Tokai, Kanto, Tohoku, Hokkaido, etc.

  Normally, the master IP exchange 3 operates call control of all terminals that are connected by the IP network 1 and monitors the status of the master IP exchange 3 and the slave IP exchange 4. If the master IP switch 3 in Tokyo is suspended due to a disaster or the like, or if a failure occurs in the line between the IP network 1 and the master IP switch 3, the master IP switch 3 in Tokyo Operation switching to the slave IP switch 4 in Osaka is performed.

  In each base 2, the backup IP switch 5 is connected to the local area network (LAN) of the base 2, and when both the master IP switch 3 and the slave IP switch 4 are suspended, the telephone of the base 2 It is an exchange that operates call control of terminals accommodated in the system.

  The packet converter (PU) 6 is connected to the LAN of the base 2 and is connected to the extension terminal control device (LIN) 7 and the office trunk (COT) 8 which are a plurality of extension terminal interfaces. And analog signals are converted to each other.

  The extension terminal control device 7 is connected to an extension terminal 9 which is a plurality of analog telephones. The packet conversion device 6, the extension terminal control device 7, and the office line trunk 8 constitute a line control device 13 that manages call control at the base 2.

  In FIG. 1, a master IP switch 3 and a slave IP switch 4 are provided with a central controller (CC) (not shown) and a main memory (MM) for storing various data. The central control unit performs a call state detection unit 101 that detects the call state of the extension terminal 9 accommodated in the line control device 13, for example, the extension terminal control device 7, and the packet conversion device 6 in the line control device 13. And a call information notification unit 102 that notifies call information corresponding to the call state of the extension terminal 9.

  The main memory includes a RAM 103 that stores the call status of the extension terminal 9 and a ROM 104 that stores, for example, station data, a station program, a table for managing call information corresponding to the call status, and the like.

  When the call state detection unit 101 detects a call state of the extension terminal 9, for example, “calling state”, for example, the call state detection unit 101 stores the call state of this “calling state” in the RAM 103.

  When the call information notification unit 102 detects a call state of “calling state”, for example, the call information corresponding to the call state of “calling state”, that is, call information “not busy / busy” is stored in the ROM 104 (see FIG. 4). ) And the read “unused / not in call” call information is notified to the packet conversion device 6 in the line control device 13 accommodating and connecting the extension terminal 9.

  The central control unit and the main memory inside the master IP exchange 3 and the slave IP exchange 4 have been described. However, for convenience of explanation, the central control unit and the main memory are similarly installed in the backup IP exchange 5 for each base 2. It shall be built-in.

  When the packet conversion device 6 in the line control device 13 detects the call information from the call information notification unit 102 in the master IP switch 3, the call information memory 6A for storing the call information and the operation stop of the master IP switch 3 are stopped. And a call information transfer unit 6B for notifying the slave IP switch 4 that has started operation of the call information stored in the call information memory 6A.

  Further, when detecting the call information from the call information notification unit 102 inside the slave IP switch 4, the packet conversion device 6 stores this call information in the call information memory 6A, and when detecting the operation stop of the slave IP switch 4, Call information stored in the call information memory 6A is notified to the backup IP exchange 5 which has started operation through the call information transfer unit 6B. The call information transfer unit 6B notifies the backup IP exchange 5 that accommodates and connects the extension terminal 9 for each extension terminal 9.

  The first communication control device according to the claims is the master IP switch 3, the second communication control device is the slave IP switch 4, the third communication control device is the backup IP switch 5, the communication state detecting means is the call state detecting unit 101, The communication status information notification means is the call information notification section 102 and the ROM 104, the communication device is the line control device 13 and the extension terminal 9, the communication terminal control device is the packet conversion device 6 and the extension terminal control device 7, the storage means is the call information memory 6A, The status information notification means corresponds to the call information transfer unit 6B, and the communication terminal corresponds to the extension terminal 9.

  FIG. 2 is a diagram showing a data format of the memory area 20 of the packet conversion device 6 at the site A, the site B, and other sites not shown in FIG. As shown in FIG. 2, the area 20 stores LIN numbers (LIN1 to LIN16) of a plurality of extension terminal control devices 7 connected to the packet conversion device 6. In the area 21 corresponding to each extension terminal control device 7, the extension number of the extension terminal 9 is registered corresponding to a plurality of port numbers (port 1 to port 8). That is, the LIN number and the port number represent the accommodation position of the extension terminal 9, and the extension number of the extension terminal 9 is uniquely specified by the LIN number and the port number. Therefore, the master IP switch 3, the slave IP switch 4, and the backup IP switch 5 can accommodate the LIN number and the port number connected to the packet converter 6 without being aware of the extension number. A specific extension terminal 9 can be designated.

  FIG. 3 is an explanatory diagram showing a data structure of call information notified from the call information notification unit 102 in the master IP switch 3 or the slave IP switch 4 to the packet conversion device 6 in the line control device 13.

  The call information 30 shown in FIG. 3 is composed of accommodation location information 31 for storing the LIN number and port number shown in FIG. 2 and call information contents 32 corresponding to the call state of the extension terminal 9.

  FIG. 4 shows the table contents of the call information management table 40 of the ROM 104 in the master IP switch 3 and the slave IP switch 4. The call information management table 40 shows the call state 41 of the extension terminal 9 and the call state. Corresponding call information 42 is managed. As shown in FIG. 4, the call state 41 includes a “vacant state” in which a call can be made, a “call state” in which a call is made to another terminal, and an incoming call from another terminal. "Incoming state", "Call state" in which a call is being made with another terminal, "Waiting state" in which a call with another terminal is terminated and waiting for call control for disconnection, and various other states such as incoming The “transfer state” for transferring the message to another terminal, the “proxy response state” for responding to an incoming call to another terminal by proxy, and the like are managed.

  However, the packet converter 6 of the line controller 13 manages the respective call information corresponding to such various call states and switches from the master IP switch 3 to the slave IP switch 4, or the slave IP switch. When switching from 4 to the backup IP exchange 5, the call information memory 6 </ b> A in the packet converter 6 is configured to notify the call information indicating various stored call states to the newly started exchange. Storage capacity becomes enormous, and it takes much time to transfer call information when switching operations on the IP exchange side.

  Therefore, in order to cope with such a situation, the call information 42 in FIG. 4 supports three types of call information of “available”, “busy”, and “other than busy / busy” for all call states. It is configured to do. That is, in the communication state of the line control device 13 related to call control, three types of call information related to the “communication state” and the minimum communication state necessary for communication disconnection at the time of operation switching related to communication control are line controlled. The packet conversion device 6 in the device 13 is notified, the call information is stored in the call information memory 6A in the packet conversion device 6, and is stored in the call information memory 6A for the IP exchange that has newly started operation. Three types of call information are notified.

  FIG. 5 is a sequence diagram showing the transition of the master IP switch 3 and the packet conversion device 6 until the two extension terminals 9 of the base 2 in FIG. 1, for example, the extension terminals 9A and 9B reach a call. is there. Now, the master IP switch 3 operates in the active system, and the slave IP switch 4 operates in the standby system. That is, the packet conversion device 6, the extension terminal control device 7, the extension terminal 9 </ b> A, and the extension terminal 9 </ b> B in the line control device 13 are operating by the operation of the master IP switch 3.

  Here, when the extension terminal 9A dials the extension number of the extension terminal 9B by a call operation (step S100), dial information is transmitted from the extension terminal 9 to the extension terminal control device 7 (step S101). The extension terminal control device 7 that has received the dial information similarly transmits the dial information to the packet conversion device 6 (step S102). The packet conversion apparatus 6 that has received the dial information transmits the dial information to the master IP exchange 3 in the same manner (step S103).

  When the master IP exchange 3 analyzes the received dial information and recognizes that it is a connection request from the extension terminal 9A to the extension terminal 9B, the call status of the extension terminal 9A is changed from "empty" to "calling". In step S104, tone information (ringing tone) is transmitted to the packet converter 6 (step S105). The packet converting apparatus 6 that has received the tone information transmits a ringing tone, that is, a ring back tone, to the extension terminal 9A (step S106).

  Next, after transmitting the tone information, the master IP exchange 3 stores the call information corresponding to the “calling state” in step S104, that is, the call information “not busy / not in call”, in the call information management table 40 (see FIG. 4), and notifies the packet conversion device 6 of the call information of the extension terminal 9A “not available / not in call” (step S107). The packet conversion device 6 stores the call information “not available / not in call” of the extension terminal 9A notified from the master IP exchange 3 in the call information memory 6A (step S108).

  Next, the master IP exchange 3 changes the call state of the extension terminal 9B from “idle state” to “incoming state” (step S109), and transmits incoming information to the packet converter 6 (step S110). The packet conversion device 6 that has received the incoming information similarly transmits the incoming information to the extension terminal control device 7 (step S111). The extension terminal control device 7 that has received this incoming call information similarly transmits the incoming call information to the extension terminal 9B (step S112). The extension terminal 9B that has received the incoming call information rings the incoming call notification (step S113).

  After transmitting the incoming call information, the master IP exchange 3 stores the call information corresponding to the “incoming call status” in step S109, that is, the call information “not busy / not in call”, in the call information management table 40 of the ROM 104 (see FIG. 4). And notifies the packet converter 6 of the call information of the extension terminal 9A "not available / not in a call" (step S114). The packet conversion device 6 notified of this call information stores the call information of the extension terminal 9B “unused / not busy” in the call information memory 6A (step S115).

  When the extension terminal 9B ringing the incoming call notification responds by an off-hook operation (step S116), response information is transmitted to the extension terminal control device 7 (step S117). The extension terminal control device 7 that has received the response information similarly transmits the response information to the packet conversion device 6 (step S117). The packet conversion device 6 that has received the response information transmits the response information to the master IP exchange 3 in the same manner (step S119).

  Receiving this response information, the master IP exchange 3 changes the call state of the extension terminal 9A from “calling state” to “calling state” (step S120), and changes the call state of the extension terminal 9B from “incoming state” to “ Change to "call state" (step S121). Further, the master IP exchange 3 transmits the call information related to the extension terminal 9A to the packet conversion device 6 so that a call path between the extension terminal 9A and the extension terminal 9B is formed by the packet conversion device 6 ( In step S122, the call information related to the extension terminal 9B is transmitted (step S123).

  The packet conversion apparatus 6 that has received the call information forms a call path between the extension terminal 9A and the extension terminal 9B (step S124). Thereby, a telephone call is started between the extension terminal 9A and the extension terminal 9B. During this call, the packet conversion device 6 monitors the state of the extension terminal 9A and the extension terminal 9B, but the operation related to call control for the extension terminal 9A and the extension terminal 9B is stopped until a disconnection request is made. become.

  When a call is started between the extension terminal 9A and the extension terminal 9B, the master IP exchange 3 stores the call information corresponding to the “call state” in step S120, that is, the call information “calling” in the call information management table in the ROM 104. 40 (see FIG. 4), and the call information of “busy” of the extension terminal 9A is notified to the packet converter 6 (step S125). The packet conversion device 6 notified of this call information stores the call information “calling” of the extension terminal 9A in the call information memory 6A (step S126).

  Further, the master IP exchange 3 reads the call information corresponding to the “call state” in step S121, that is, the call information “in call” from the call information management table 40 (see FIG. 4) of the ROM 104, and the extension terminal 9B. Call information “busy” is notified to the packet converter 6 (step S127). The packet conversion device 6 notified of this call information stores the call information “calling” of the extension terminal 9B in the call information memory 6A (step S128).

  Therefore, according to the operation sequence shown in FIG. 5, when the master IP switch 3 side detects the call status of the extension terminal 9A and extension terminal 9B through the call status detection unit 101, the extension terminal 9A and extension terminal through the call information notification unit 102 The call information corresponding to the call state of 9B is read from the call information management table 40, and the read call information of the extension terminal 9A and the extension terminal 9B is stored in the line controller 13 that accommodates and connects the extension terminal 9A and the extension terminal 9B. When notifying the packet conversion device 6 and detecting the call information of the extension terminal 9A and the extension terminal 9B on the packet conversion device 6 side, the call information of the extension terminal 9A and the extension terminal 9B is stored in the call information memory 6A. Therefore, on the slave IP switch 4 side, for example, when the operation stop of the master IP switch 3 is detected and the operation is started. Te, it is possible to prevent since it is possible to recognize the call information of the extension terminal 9 side, for example, the forced disconnection of the call involving the extension terminal 9 busy.

  FIG. 6 shows the transition when the two extension terminals 9 at the base 2 in FIG. 1, for example, the extension terminal 9A and the extension terminal 9B are switched to the slave IP switch 4 due to a failure of the master IP switch 3 or the like. FIG. Now, the master IP switch 3 operates in the active system, and the slave IP switch 4 operates in the standby system. That is, the packet conversion device 6, the extension terminal control device 7, the extension terminal 9 </ b> A, and the extension terminal 9 </ b> B in the line control device 13 are operating by the operation of the master IP switch 3.

  When the packet conversion apparatus 6 forms a speech path between the extension terminal 9A and the extension terminal 9B and the extension terminal 9A and the extension terminal 9B are talking, the master IP switch 3 indicates that the extension terminal 9A ", That is," calling "call information is read from the call information management table 40 (see FIG. 4) of the ROM 104, and the call information" calling "of the extension terminal 9A is notified to the packet converter 6. (Step S200). The packet conversion device 6 notified of the call information stores the call information “calling” of the extension terminal 9A in the call information memory 6A (step S201).

  Next, the master IP exchange 3 reads the call information corresponding to the “calling state” of the extension terminal 9B, that is, the call information “calling” from the call information management table 40 (see FIG. 4) of the ROM 104, and this extension terminal The packet conversion device 6 is notified of the call information “Busy” of 9B (step S202). The packet conversion device 6 notified of the call information stores the call information “calling” of the extension terminal 9B in the call information memory 6A (step S203).

  When a failure occurs in the master IP switch 3 (step S204), the slave IP switch 4 is switched from the standby system to the active system (step S205). As a result, the packet conversion device 6, the extension terminal control device 7, the extension terminal 9 A, and the extension terminal 9 B in the line control device 13 operate from the state in which the master IP switch 3 is operating, and then operate the slave IP switch 4. To switch to an operating state (step S206).

  Next, the call information transfer unit 6B of the packet conversion device 6 reads out the call information “in call” of the extension terminal 9A and the call information “in call” of the extension terminal 9B from the call information memory 6A. "Is notified to the slave IP switch 4 that has started operation (step S207). The slave IP exchange 4 notified of the call information sets the call state of the extension terminal 9A to “calling state” (step S208), and sets the call state of the extension terminal 9B to “calling state” (step S209). .

  Next, when the extension terminal 9A is disconnected by an on-hook operation (step S210), the extension terminal 9A transmits disconnect information to the extension terminal control device 7 (step S211). The extension terminal control device 7 that has received this disconnection information similarly transmits the disconnection information to the packet conversion device 6 (step S212). The packet conversion device 6 that has received this disconnection information transmits the disconnection information to the slave IP switch 4 in the same manner (step S213). Receiving this disconnection information, the slave IP exchange 4 changes the call state of the extension terminal 9A from “call state” to “empty state” (step S214).

  Next, the slave IP exchange 4 transmits call end information to instruct the packet conversion device 6 to release the call path (step S215), and further corresponds to “empty state” in step S214. The call information, that is, the “vacant” call information is read from the call information management table 40 (see FIG. 4) of the ROM 104, and the “vacant” call information of the extension terminal 9A is notified to the packet converter 6 (step S216). The packet conversion device 6 notified of the call information stores the “vacant” call information of the extension terminal 9A in the call information memory 6A (step S217).

  Next, when the extension terminal 9B is disconnected by an on-hook operation (step S218), the extension terminal 9B transmits disconnection information to the extension terminal control device 7 (step S219). The extension terminal control device 7 that has received the disconnect information transmits the disconnect information to the packet converter 6 (step S220). The packet conversion device 6 that has received this disconnection information transmits the disconnection information to the slave IP exchange 4 (step S221). Receiving this disconnection information, the slave IP exchange 4 changes the call state of the extension terminal 9B from “call state” to “empty state” (step S222).

  Next, the slave IP exchange 4 transmits call end information to instruct the packet converter 6 to release the call path (step S223), and further corresponds to the “vacant state” in step S222. The call information, that is, the “vacant” call information is read from the call information management table 40 (see FIG. 4) of the ROM 104, and the “vacant” call information of the extension terminal 9B is notified to the packet converter 6 (step S224). The packet converter 6 notified of the call information stores the “vacant” call information of the extension terminal 9B in the call information memory 6A (step S225).

  According to the operation sequence shown in FIG. 6, when the master IP switch 3 fails and starts operation to the slave IP switch 4 during a call between the extension terminal 9A and the extension terminal 9B, the extension terminal 9A and the extension terminal The extension terminal 9A stored in the call information memory 6A in the packet conversion apparatus 6 in the line control apparatus 13 that accommodates and connects the terminal 9B and the call information “in call” of the extension terminal 9B are notified to the slave IP switch 4 that has started operation. At the same time, in the slave IP exchange 4, since the call information of the extension terminal 9A and the extension terminal 9B is the call information “calling”, the call control of the extension terminal 9A and the extension terminal 9B is performed until a disconnection request is made. Since the operation is stopped, the slave IP switch 4 can be used even if the master IP switch 3 breaks down during a call between the extension terminal 9A and the extension terminal 9B. It can hold call between A and the extension terminals 9B.

  FIG. 7 is a sequence diagram showing a transition when the extension terminal 9A calls the extension terminal 9B and switches to the slave IP exchange 4 due to a failure of the master IP exchange 3. Now, the master IP switch 3 operates in the active system, and the slave IP switch 4 operates in the standby system. That is, the packet conversion device 6, the extension terminal control device 7, the extension terminal 9 </ b> A, and the extension terminal 9 </ b> B in the line control device 13 are operating by the operation of the master IP switch 3.

  Here, when the extension terminal 9A dials the extension number of the extension terminal 9B in response to the call operation (step S300), the extension terminal 9A transmits dial information to the extension terminal control device 7 (step S301). The extension terminal control device 7 that has received the dial information similarly transmits the dial information to the packet conversion device 6 (step S302). The packet conversion apparatus 6 that has received the dial information transmits the dial information to the master IP exchange 3 in the same manner (step S303).

  The master IP exchange 3 that has received the dial information changes the call state of the extension terminal 9A from the “empty state” to the “calling state” (step S304), and sends tone information (ringing sound) to the packet converter 6. Transmit (step S305). The packet converter 6 that has received the tone information transmits a ringing tone, that is, a ring back tone, to the extension terminal 9A (step S306).

  After transmitting the tone information, the master IP exchange 3 transmits the call information corresponding to the “calling state” in step S304, that is, call information management table 40 in the ROM 104 (see FIG. 4). ), And notifies the packet conversion device 6 of the call information of the extension terminal 9A “available / not in call” (step S307). The packet conversion device 6 notified of the call information stores the call information of the extension terminal 9A “unused / not in a call” in the call information memory 6A (step S308).

  Next, the master IP exchange 3 changes the call state of the extension terminal 9B from “empty state” to “incoming state” (step S309), and transmits incoming information to the packet converter 6 (step S310). The packet conversion device 6 that has received this incoming information similarly transmits the incoming information to the extension terminal control device 7 (step S311). The extension terminal control device 7 that has received the incoming call information similarly transmits the incoming call information to the extension terminal 9B (step S312). The extension terminal 9B that has received the incoming call information rings the incoming call notification (step S313).

  After transmitting the incoming call information, the master IP exchange 3 sends the call information corresponding to the “incoming call state” in step S309, that is, the call information management table 40 in the ROM 104 (see FIG. 4). ), And notifies the packet conversion device 6 of the call information of “extension / non-calling” of the extension terminal 9B (step S314). The packet conversion device 6 notified of this call information stores the call information of the extension terminal 9B “unused / not in a call” in the call information memory 6A (step S315).

  Here, when a failure occurs in the master IP switch 3 (step S316), the slave IP switch 4 is switched from the standby system to the active system (step S317). As a result, the packet conversion device 6, the extension terminal control device 7, the extension terminal 9 </ b> A, and the extension terminal 9 </ b> B in the line control device 13 are operated by the operation of the master IP switch 3, and then the slave IP switch 4 is operated. To switch to an operating state (step S318).

  Next, the call information transfer unit 6B of the packet conversion device 6 reads the call information of “extension / non-calling” of the extension terminal 9A from the call information memory 6A, and sets the “terminal / non-calling” of the extension terminal 9A. The call information is notified to the slave IP switch 4 that has started operation (step S319). The slave IP exchange 4 notified of this call information changes the call state corresponding to the extension terminal 9A to the “waiting for disconnection” state because the extension terminal 9A is the call information “not available / not in call” ( Step S320).

  Next, the slave IP exchange 4 transmits the tone information of the restriction sound to the packet converter 6 (step S321). The packet conversion device 6 that has received the tone information transmits a restriction sound for prompting the extension terminal 9A to disconnect (step S322). That is, the extension terminal 9A is forcibly disconnected.

  After transmitting the tone information, the slave IP exchange 4 sets the call state of the extension terminal 9B to “empty state” (step S323), and transmits an incoming signal stop command to the packet converter 6 (step S324). ). The packet conversion device 6 that has received this incoming signal stop command similarly transmits the incoming signal stop command to the extension terminal control device 7 (step S325). The extension terminal control device 7 that has received this incoming signal stop command similarly transmits the incoming signal stop command to the extension terminal 9B (step S326). The extension terminal 9B that has received this incoming signal stop command stops ringing of incoming notification (step S327).

  After transmitting the incoming signal stop command, the slave IP exchange 4 sends the call information corresponding to the “empty state”, that is, the “empty” call information from the call information management table 40 (see FIG. 4) of the ROM 104 in step S323. Read and notify the packet conversion apparatus 6 of the “vacant” call information of the extension terminal 9B (step S328). The packet conversion device 6 notified of this call information stores the “vacant” call information of the extension terminal 9B in the call information memory 6A (step S329).

  According to the operation sequence shown in FIG. 7, for example, when the master IP switch 3 fails and starts operation to the slave IP switch 4 during an incoming call from the extension terminal 9A to the extension terminal 9B, the extension terminal 9A and the extension Slave IP for starting operation of the call information “excluding idle / busy” of the extension terminal 9A and extension terminal 9B stored in the call information memory 6A in the packet conversion apparatus 6 in the line control apparatus 13 accommodating and connecting the terminal 9B In addition to notifying the exchange 4, the call information of the extension terminal 9A and the extension terminal 9B in the slave IP exchange 4 is call information other than "busy / non-calling", that is, call information other than "busy". Since the call control operation of the extension terminal 9B is started and the call is disconnected, the extension terminals 9A and 9B are forcibly disconnected so that the extension terminals other than those during a call A and the extension terminal 9B can be avoided that a incommunicable state prolonged unnecessarily.

  In the above embodiment, the case where the operation of the slave IP switch 4 is started in response to the stop of the operation due to the failure of the master IP switch 3 has been described as an example. It goes without saying that the same effect can be obtained even when the operation of the backup IP exchange 5 is started according to the operation, for example, in the call information transfer unit 6B of the packet conversion device 6, for example, the operation such as failure of the slave IP exchange 4 When the stop is detected, the call information is read from the call information memory 6A, the read call information is notified to the backup IP switch 5, and the backup IP switch 5 receives the call information of the extension terminal 9 from the call information transfer unit 6B. Based on this, when the extension terminals 9 accommodated in the extension terminal control device 7 are in a call, the extension terminal 9 issues a disconnection request. Until that stops the operation relating to the call control for the extension terminal 9, it goes without saying that maintaining a call between the extension terminal 9.

  Further, the backup IP exchange 5 is based on the call information of the extension terminal 9 from the call information transfer unit 6B, and the extension terminals 9 accommodated in the extension terminal control device 7 are not in a call state, that is, “vacant” or “empty” In the case of call information other than “during a call”, the extension terminal 9 accommodated in the extension terminal control device 7 is forcibly disconnected.

  Therefore, according to the present embodiment, when the master IP exchange 3 in operation detects the call status of the extension terminal 9 related to call control, the call information related to the call status of the extension terminal 9 is transmitted to the extension terminal 9. The packet converter 6 notifies the packet converter 6 in the line controller 13 and, when detecting the call information from the master IP switch 3, stores the call information in the call information memory 6A. When the operation stop is detected, the call information stored in the call information memory 6A is notified to the slave IP switch 4 which has started operation. Therefore, the slave IP switch 4 detects the operation stop of the master IP switch. Since the call information on the extension terminal 9 side can be recognized when the operation is started, it is possible to prevent forcible disconnection of the call related to the extension terminal 9 during the call.

  According to this embodiment, when the operation stop of the slave IP switch 4 is detected, the backup IP switch 5 that starts the operation related to the call control of the extension terminal 9 that can communicate regardless of the operation stop is provided. When the operation of the slave IP exchange 4 is detected, the packet conversion apparatus 6 in the line control apparatus 13 accommodating and connecting the terminal 9 notifies the backup IP exchange 5 of the operation start of the call information stored in the call information memory 6A. Therefore, even when the master IP switch 3 and the slave IP switch 4 are suspended, it is possible to avoid a situation in which all the extension terminals 9 become unable to communicate through the backup IP switch 5.

  According to the present embodiment, when the operating slave IP switch 4 detects the call state of the extension terminal 9 related to call control, the call information related to the call state of the extension terminal 9 is accommodated in the extension terminal 9. In addition to notifying the packet conversion device 6 in the line control device 13 to be connected, the packet conversion device 6 stores the call information in the call information memory 6A when detecting the call information related to the extension terminal 9, and the slave IP exchange. 4 is detected, the call information stored in the call information memory 6A is notified to the backup IP exchange 5 which has started operation. Therefore, on the backup IP exchange 5, the operation of the slave IP exchange 4 is stopped. When detecting and starting the operation, the call information on the extension terminal 9 side can be recognized, so that it is possible to prevent forcible disconnection of the call related to the extension terminal 9 during the call. That.

  Further, according to the present embodiment, when the operation stop of the master IP switch 3 is detected and the slave IP switch 4 starts the operation related to the call control of the extension terminal 9, the extension terminal 9 is accommodated and connected. When the call information of the extension terminal 9 is detected from the call information memory 6 of the packet converter 6 in the line control device 13 and the call information of the extension terminal 9 is “busy”, the communication from the extension terminal 9 is disconnected. Since the operation related to the call control for the extension terminal 9 is stopped until the request is detected, when the operation is switched from the master IP switch 3 to the slave IP switch 4 during the call of the extension terminal 9, the extension terminal 9 The call of the extension terminal 9 during the call can be maintained as it is without forcibly disconnecting the call.

  Further, according to the present embodiment, when the operation stop of the slave IP switch 4 is detected and the backup IP switch 5 starts the operation related to the call control of the extension terminal 9, the extension terminal 9 is accommodated and connected. When the call information of the extension terminal 9 is detected from the call information memory 6 of the packet converter 6 in the line control device 13 and the call information of the extension terminal 9 is “busy”, the communication from the extension terminal 9 is disconnected. Since the operation related to the call control for the extension terminal 9 is stopped until the request is detected, when the operation is switched from the slave IP switch 4 to the backup IP switch 5 during the call of the extension terminal 9, the extension terminal 9 The call of the extension terminal 9 during the call can be maintained as it is without forcibly disconnecting the call.

  Further, according to the present embodiment, when the operation stop of the master IP switch 3 is detected and the slave IP switch 4 starts the operation related to the call control of the extension terminal 9, the extension terminal 9 is accommodated and connected. The call information of the extension terminal 9 is detected from the call information memory 6 of the packet converter 6 in the line control device 13, and the call information of the extension terminal 9 is "vacant" other than "busy" or "vacant / busy" In the case of “other than”, the extension terminal 9 is disconnected and the operation related to the call control is started, so that the master IP switch 3 is operated to the slave IP switch 4 in the communication state other than the call of the extension terminal 9. When switching, the extension terminal 9 is forcibly disconnected, so that the state in which the extension terminal 9 cannot communicate can be avoided from being unnecessarily prolonged.

  Further, according to the present embodiment, when the operation stop of the slave IP switch 4 is detected and the backup IP switch 5 starts the operation related to the call control of the extension terminal 9, the extension terminal 9 is accommodated and connected. The call information of the extension terminal 9 is detected from the call information memory 6 of the packet converter 6 in the line control device 13, and the call information of the extension terminal 9 is "vacant" other than "busy" or "vacant / busy" In the case of “other than”, the extension terminal 9 is disconnected and the operation related to the call control is started, so that the slave IP switch 4 is operated from the slave IP switch 4 to the backup IP switch 5 in the communication state other than the call of the extension terminal 9. When switching, the extension terminal 9 is forcibly disconnected, so that the state in which the extension terminal 9 cannot communicate can be avoided from being unnecessarily prolonged.

  Further, according to the present embodiment, among the call states of the extension terminal 9 related to call control, the minimum number of lines necessary for the extension terminal 9 to disconnect communication when switching the operation related to “call state” and call control. Since the call information related to the communication state, that is, the types of call information of “busy”, “vacant”, and “empty / other than busy” are made into three types, the call information memory of the packet converter 6 that stores the call information The storage capacity of 6A can be suppressed to the necessary minimum, and further, the call information transmission time involved in operation switching can be greatly shortened.

  Further, according to the present embodiment, when the call information notification unit 102 of the operating IP exchange detects the occurrence of call control in the extension terminal 9 through the call state detection unit 101, each extension related to the occurrence of call control The call information of the terminal 9 is notified to the packet conversion device 6 of the line control device 13 that accommodates the extension terminal 9, and the packet conversion device 6 stores the call information of the extension terminal 9 in the call information memory 6A. Therefore, a uniform communication service can be provided for each extension terminal 9.

  In the above embodiment, as shown in FIG. 5, FIG. 6, and FIG. 7, call connection between extension terminals 9, such as extension terminal 9A and extension terminal 9B, accommodated and connected to the line control device 6 in the same base. In the case of a call connection between the extension terminal 9A and the extension terminal 9C at a different base 2, for example, the call information notification unit 102 of the master IP switch 3 receives the call information of the extension terminal 9A. The packet conversion device 6 in the line control device 13 accommodating and connecting the extension terminal 9A is notified, and the call information of the extension terminal 9C is notified to the packet conversion device 6 in the line control device 13 accommodating and connecting the extension terminal 9C. At the same time, for example, when the operation from the master IP switch 3 to the slave IP switch 4 is started, the call information of the extension terminal 9A is scanned from the call information transfer unit 6B in the line control device 13 accommodating and connecting the extension terminal 9A. The same effect is obtained by notifying the slave IP switch 4 of the call information of the extension terminal 9C from the call information transfer unit 6B in the line control device 13 that accommodates and connects the extension terminal 9C. Needless to say.

  Further, in the above embodiment, the call information memory 6A and the call information transfer unit 6B are built in the packet conversion device 6 in the line control device 13 accommodating and connecting the extension terminal 9, and the analog extension terminal 9 is taken as an example. As described above, for example, in the case of the IP terminal 14 directly connected to the IP network 1, although not shown, the call information memory and the call information transfer unit are held inside the IP terminal 14, and the master IP exchange 3 in operation. Alternatively, when the slave IP exchange 4 detects the call state of the IP terminal 14, the IP terminal 14 is notified of call information corresponding to this call state, and the IP terminal 14 receives the call state of the IP terminal 14 from the operating IP exchange. Is detected, the call information is stored in the call information memory. For example, when the operation from the master IP switch 3 to the slave IP switch 4 is started, the call information memory in the IP terminal 14 is stored. The call information of 憶中, since to notify the slave IP exchange 4 through the call information transfer unit, even when the IP terminal 14, it is needless to say that the same effect can be obtained.

  Further, in the above embodiment, in the case of call control of the external line terminal 15 accommodated and connected to the line control device 13 through the office line trunk 8 and the PSTN 16, for example, the call information notification unit 102 of the master IP switch 3 Call information is notified to the packet conversion device 6 in the line control device 13 that accommodates and connects the office line trunk 8 of the external line terminal 15, and for example, when the operation from the master IP switch 3 to the slave IP switch 4 is started, the external line The call information transfer unit 6B in the line controller 13 for accommodating and connecting the office line trunk 8 of the terminal 15 notifies the slave IP switch 4 of the call information of the outside line terminal 15 and accommodates and connects the office line trunk 8 of the outside line terminal 15 The same effect can be obtained by notifying the slave IP switch 4 of the call information of the external terminal 15 from the call information transfer unit 6B in the line control device 13 Is it is needless to say.

  Further, in the above embodiment, for example, when the call state of the extension terminal 9 is detected in the operating master IP switch 3, the call information corresponding to this call state is stored in the packet conversion device 6 in the line control device 13. The call information memory 6A stores the call information stored in the call information memory 6A when the operation stop of the active master IP 3 is detected, for example. It is needless to say that the present invention is not limited to voice communication of telephones such as 9 and can be applied to data communication such as a personal computer.

  According to the communication control system of the present invention, when the first communication control device in operation detects the communication state of the communication device related to communication control, the communication device notifies the communication device of state information related to the communication state of the communication device. In addition, when detecting the status information from the operating first communication control device, the communication device stores the status information in a storage unit, and when detecting the operation stop of the first communication control device, the storage device stores the status information. Since the second communication control device is notified of the status information stored in the means, the second communication control device side detects the operation stop of the first communication control device and starts the operation. Since the status information on the device side can be recognized, forcible disconnection of communication related to the communication device in communication can be prevented, so that, for example, master IP exchange that operates call control for a plurality of bases And it is useful in a communication control system having a slave IP exchange.

It is a block diagram which shows schematic structure of the communication control system which shows embodiment in connection with this invention. It is a figure which shows the data format of the memory of the packet converter in each base of FIG. It is a figure which shows the call information of the extension terminal memorize | stored in the memory in the master IP switch of FIG. 1, and a slave IP switch. FIG. 2 is a diagram showing call state control data for determining call information of an extension terminal stored in a memory in the master IP switch and the slave IP switch of FIG. 1. It is a sequence diagram which shows transition until two extension terminals of the base of FIG. 1 reach a telephone call. FIG. 10 is a sequence diagram showing a transition when two extension terminals are switched to a slave IP switch due to a failure of a master IP switch during a call. FIG. 11 is a sequence diagram showing a transition in a case where a master IP switch is switched to a slave IP switch when an extension terminal calls another extension terminal.

Explanation of symbols

3 Master IP switch (first communication controller)
4 Slave IP switch (second communication controller)
5 Backup IP switch (third communication controller)
6 Packet conversion device (communication device)
6A Call information memory (storage means)
6B Call information transfer unit (status information notification means)
7 Extension terminal control device (communication device and communication terminal control device)
9 Extension terminal (communication terminal)
13 Line control device (communication device)
14 IP terminal (communication device)
15 External terminal (communication equipment)
101 Call state detection unit (communication state detection means)
102 Call information notification unit (communication state information notification means)
104 ROM (communication state information notification means)

Claims (10)

A communication device, and a first communication control device and a second communication control device that enable communication control of the communication device in response to a connection request of the communication device, wherein the first communication control device is the communication device A communication control system that starts operation related to communication control of the communication device when the second communication control device detects an operation stop of the first communication control device. ,
Of the first communication control device and the second communication control device, the communication control device in operation is
Communication state detection means for detecting a communication state of the communication device involved in the communication control;
When the communication state of the communication device is detected by the communication state detection means, the communication state information notification means for notifying the communication device of state information related to the communication state of the communication device,
The communication device
When detecting the status information from the communication status information notification means, storage means for storing the status information;
A communication control system comprising: status information notification means for notifying the second communication control apparatus of status information being stored in the storage means when detecting an operation stop of the first communication control apparatus. Upon detecting an operation stop of the first communication control device and the second communication control device, the third communication control device starts operation related to communication control of a communication device capable of communication regardless of the operation stop,
The status information notification means of the communication device is:
2. The communication control system according to claim 1, wherein when the operation stop of the second communication control device is detected, the third communication control device is notified of status information stored in the storage unit. The communication device
A communication terminal and a communication terminal control device for controlling the communication terminal;
The communication status information notification means of the communication control device in operation is
When the communication status of the communication terminal in the communication device related to the communication control is detected by the communication status detection means, status information related to the communication status of the communication terminal is stored in the communication device accommodating the communication terminal. Notifying the communication terminal control device,
The communication terminal control device in the communication device is:
When detecting the status information related to the communication terminal from the communication status information notification means, this status information is stored in the storage means, and when the operation stop of the first communication control device is detected, through the status information notification means, The communication control system according to claim 1, wherein status information stored in the storage unit is notified to the second communication control device. The communication device
A communication terminal and a communication terminal control device for controlling the communication terminal;
The communication status information notification means of the communication control device in operation is
When the communication status of the communication terminal in the communication device related to the communication control is detected by the communication status detection means, status information related to the communication status of the communication terminal is stored in the communication device accommodating the communication terminal. Notifying the communication terminal control device,
The communication terminal control device in the communication device is:
When detecting the status information related to the communication terminal from the communication status information notification means, this status information is stored in the storage means, and when the operation stop of the second communication control device is detected, through the status information notification means, The communication control system according to claim 2, wherein status information stored in the storage unit is notified to the third communication control device. The second communication control device is
When detecting the operation stop of the first communication control device and starting the operation related to the communication control of the communication device, if the state information is detected from the state information notification means of the communication device, the state information is In addition to managing, if there is the communication terminal in communication state in this state information, the operation related to communication control for the communication terminal is stopped until a communication disconnection request from the communication terminal is detected. The communication control system according to claim 3. The third communication control device is:
When detecting the stop of operation of the second communication control device and starting operation related to communication control of the communication device, if the state information is detected from the state information notification means of the communication device, the state information is In addition to managing, if there is the communication terminal in communication state in this state information, the operation related to communication control for the communication terminal is stopped until a communication disconnection request from the communication terminal is detected. The communication control system according to claim 4. The second communication control device is
When detecting the operation stop of the first communication control device and starting the operation related to the communication control of the communication device, if the state information is detected from the state information notification means of the communication device, the state information is 6. The communication control according to claim 5, wherein, when there is a communication terminal other than the in-communication state in the status information, the communication terminal is disconnected and the operation related to the communication control is started. system. The third communication control device is:
When detecting the stop of operation of the second communication control device and starting operation related to communication control of the communication device, if the state information is detected from the state information notification means of the communication device, the state information is 7. The communication control according to claim 6, wherein, in addition to management, when there is a communication terminal other than the in-communication state in the state information, the communication terminal is disconnected and operation related to communication control is started. system. The communication status information notification means of the communication control device in operation is
Among the communication statuses of the communication device related to the communication control detected by the communication status detection means, the communication device disconnects the communication during the communication status of the communication device and the operation switching related to the communication control. The communication control system according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the communication apparatus is notified of state information related to a necessary minimum communication state. The communication status information notification means of the communication control device in operation is
When the communication state detection means detects the occurrence of communication control in each communication terminal in the communication device, the communication device that contains the communication terminal is notified of the state information of each communication terminal involved in the occurrence of the communication control. And
The communication terminal controller is
The communication control system according to claim 3, 4, 5, 6, 7, 8 or 9, wherein the state information of each communication terminal notified by the communication state information notifying means is stored in the storage means.

Images