JP6589730B2 - Telephone terminal, program, and extension telephone system construction method - Google Patents

Description

  The present invention relates to a technique for constructing an extension telephone system without specially installing a call control server.

  Patent Document 1 discloses a technique for constructing an extension telephone system without specially installing a call control server.

  In this technology, each IP (Internet Protocol) telephone terminal has a call control server function for processing call control such as outgoing and incoming calls and transfer of each IP telephone terminal. Only a specific IP telephone terminal determined between the IP telephone terminals enables this call control server function and processes call control of all IP telephone terminals including the own IP telephone terminal. Thus, an extension telephone system is constructed.

JP 2008-205699 A

  However, the technique described in Patent Document 1 is based on the premise that all IP telephone terminals constituting the extension telephone system belong to the same private network. For example, geographically via WAN (Wide Area Network) However, it does not consider the construction of an extension telephone system between a plurality of telephone terminals belonging to different private networks distributed in remote locations.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to construct an extension telephone system between a plurality of telephone terminals belonging to different private networks without specially installing a call control server. It is to provide a technique suitable for this.

  In order to solve the above problems, in the present invention, an extension telephone system is constructed across different private networks using a plurality of telephone terminals having a call control server function and a bridge function. That is, for each private network, the call control server function of any one of the telephone terminals belonging to the same private network is enabled, and the same private network is connected to the telephone terminal for which this call control server function is enabled. The sub-extension telephone system is constructed between the telephone terminals belonging to the same private network by executing the call control of the telephone terminals belonging to the telephone network. In addition, for each sub-extension telephone system, the bridge function of at least one of the telephone terminals constituting the sub-extension telephone system is enabled, and another sub-extension telephone is connected to the telephone terminal that has enabled this bridge function. Make a bridge connection with a phone terminal that has the bridge function enabled. Then, the call control server function of the other sub-extension telephone system is connected via a bridge connection to the telephone terminal that has enabled the call control server function of each sub-extension telephone system via the bridge connection. Relay to phone terminals that have enabled As a result, the extension telephone system is constructed by linking the sub-extension telephone systems constructed in different private networks.

For example, the present invention is a telephone terminal that constitutes a predetermined telephone system with one or more,
Call control means for executing processing related to call control of the own telephone terminal and the other LAN terminal connected to the first LAN (Local Area Network) connected to the own telephone terminal;
Bridge means for performing a bridge connection between the first LAN and the second LAN;
Call control validity / invalidity setting means for setting validity / invalidity of the call control means;
Bridge valid / invalid setting means for setting validity / invalidity of the bridge means, and
The call control means includes
When the call control validity / invalidity setting means is set to be effective, processing related to call control of the own telephone terminal and the other telephone terminal connected to the first LAN is executed, and the second LAN A call control command related to the call control of the other telephone terminal connected to the other telephone terminal connected to the first LAN, the bridge means being enabled,
The bridging means includes
When the bridge valid / invalid setting means is valid, the bridge connection is performed between the first LAN and the second LAN, and the bridge is connected to the first LAN. Relaying a call control command received from another telephone terminal in which the call control means is enabled to another telephone terminal connected to the second LAN and in which the bridging means is enabled, When a call control command is received from another telephone terminal that is connected to the second LAN and in which the bridging means is enabled, the received call control command is connected to the first LAN. The call control means relays the call to another telephone terminal that is set to be effective.

Here, the bridge valid / invalid setting means includes:
When a bridge operation with designation of another telephone terminal connected to the second LAN is received from the operator, the bridging means is set to be effective and the other telephone terminal designated by the bridge operation is set. The call control means connected to the first LAN is notified that the address information of the own telephone terminal used for relaying the call control command is notified and the bridging means is enabled. Notify other phone terminals that are set,
When the other telephone terminal receives address information used for relaying a call control command from another telephone terminal connected to the second LAN and for which the bridging means is effectively set, the bridge means is Set to valid, notify the other telephone terminal of the address information of the own telephone terminal used for relaying the call control command, and connect to the first LAN that the bridging means is set to valid The other telephone terminal in which the call control means is enabled may be notified.

  In the present invention, for each private network, a sub-extension telephone system is constructed by enabling the call control server of any one of the telephone terminals belonging to the private network, and for each sub-extension telephone system, The bridge function of at least one of the telephone terminals constituting the extension telephone system is enabled, and the sub-extension telephone systems are linked and linked. Therefore, according to the present invention, it is possible to construct an extension telephone system between a plurality of telephone terminals belonging to different private networks without specially installing a call control server.

FIG. 1 is a schematic configuration diagram of an extension telephone system according to an embodiment of the present invention. FIG. 2 is a sequence diagram for explaining an example of the construction operation of the sub-extension telephone system 1 according to the embodiment of the present invention. FIG. 3 is a sequence diagram for explaining an example of the bridge connection operation of the sub-extension telephone system 1 according to the embodiment of the present invention. FIG. 4 is a sequence diagram for explaining an example of an extension outgoing / incoming operation of the extension telephone system according to the embodiment of the present invention. FIG. 5 is a schematic functional configuration diagram of the radio telephone terminal 2. FIG. 6 is a flowchart for explaining the operation of joining the radio telephone terminal 2 to the extension telephone system. FIG. 7 is a flowchart for explaining the bridge connection operation of the wireless telephone terminal 2. FIG. 8 is a flowchart for explaining the call control server operation of the radio telephone terminal 2 in which the call control server function is set to be valid. FIG. 9 is a flowchart for explaining the bridge relay operation of the radiotelephone terminal 2 in which the bridge function is set to be valid.

  An embodiment of the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of an extension telephone system according to the present embodiment.

  As shown in the figure, the extension telephone system according to the present embodiment includes a plurality of sub-extension telephones constructed on different private networks (LAN) 4-1 and 4-2 (hereinafter also simply referred to as private network 4). System 1-1, 1-2 (hereinafter also simply referred to as sub-extension telephone system 1) is configured. The sub-extension telephone system 1 includes at least one wireless telephone terminal 2-1 to 2-6 (hereinafter also simply referred to as a wireless telephone terminal 2) belonging to the private network 4, and the private network 4 as a communication packet network (WAN). Mobile router 3 connected to 5.

  Each wireless telephone terminal 2 has a call control server function and a bridge function. Among the wireless telephone terminals 2 belonging to the same private network 4, any one of the wireless telephone terminals 2 enables the call control server function to perform IP Call control of the radio telephone terminals 2 (including the own radio telephone terminal 2) connected to the telephone network 6 and belonging to the same private network 4 is performed. Thereby, the sub extension telephone system 1 is constructed between the radio telephone terminals 2 belonging to the same private network 4.

  In FIG. 1, the wireless telephone terminal 2-1 enables the call control server function to connect to the IP telephone network 6 and calls of the wireless telephone terminals 2-1 to 2-3 belonging to the same private network 4-1. By executing the control, the sub-extension telephone system 1-1 is constructed. Further, the radio telephone terminal 2-4 enables the call control server function to connect to the IP telephone network 6, and performs call control of the radio telephone terminals 2-4 to 2-6 belonging to the same private network 4-2. By implementing this, a sub-extension telephone system 1-2 is constructed.

  Further, among the radio telephone terminals 2 constituting the same sub-extension telephone system 1, any one of the radio telephone terminals 2 enables the bridge function and the radio telephone in which the bridge function of the other sub-extension telephone system 1 is enabled. The terminal 2 is bridge-connected via the communication packet network 5. Here, the radiotelephone terminal 2 acquires address information in the communication packet network 5 from a STUN (Session Traversal Utilities for NATs) server 8 connected to the communication packet network 5, and passes through the SMS (Short Message Service) network 7. Then, address information in the communication packet network 5 is exchanged with the radio telephone terminal 2 of the bridge connection partner. Then, the radio telephone terminal 2 having enabled the call control server function of each sub-extension telephone system 1 sends a call to the radio telephone terminal 2 of the other sub-extension telephone system 1 to another sub-extension telephone via a bridge connection. Relay to the radio telephone terminal 2 with the call control server function of the system 1 enabled. Thereby, the extension telephone system is constructed by linking the sub-extension telephone systems 1 constructed in different private networks 4.

  In FIG. 1, the radio telephone terminals 2-2 and 2-5 enable the bridging function and connect to each other via the communication packet network 5 to link the sub-extension telephone systems 1-1 and 1-2. An extension telephone system is being built.

  FIG. 2 is a sequence diagram for explaining an example of the construction operation of sub extension telephone system 1 in the present embodiment. Here, it is assumed that none of the radio telephone terminals 2-1 to 2-3 has subscribed to the sub-extension telephone system 1-1 in the initial state and has disabled the call control server function. Here, the case where the radio telephone terminals 2-1 to 2-3 construct the sub-extension telephone system 1-1 is described, but the radio telephone terminals 2-4 to 2-6 are sub-extension telephone system 1. The same applies to -2.

  First, it is assumed that the wireless telephone terminal 2-1 receives an extension joining operation from the user (S100). In response to this, the wireless telephone terminal 2-1 owns the private telephone terminal 2-1 to which the wireless telephone terminal 2-1 belongs, until an attribution permission notice is sent from the wireless telephone terminal 2 for which the call control server function is enabled. The attribution request is repeatedly broadcasted to the network 4-1 a plurality of times (S101). However, at this time, since there is no radio telephone terminal 2 subscribing to the sub-extension telephone system 1-1, no attribution permission notification is sent.

  Next, when the wireless telephone terminal 2-1 times out after elapse of a predetermined time without receiving an attribution permission notification (S102), the call control server function is enabled (S103), and the IP telephone network 6 ( Specifically, a registration request including the external line number of the sub-extension telephone system 1-1 and the address information of the own wireless telephone terminal 2-1 is transmitted to a call control server (not shown) on the IP telephone network 6 (S104). ). Thereafter, registration to the IP telephone network 6 is completed (S105), and if a completion notification is received (S106), the radio telephone terminal 2-1 obtains its own extension number and address information on the private network 4-1. The registered terminal information is registered as call control target terminal information, and a server activation notification is broadcast to the private network 4-1 to which the own wireless telephone terminal 2-1 belongs (S107).

  Thereafter, it is assumed that the radio telephone terminal 2-2 receives an extension joining operation from the user (S108). In response to this, the wireless telephone terminal 2-2 has the private wireless telephone terminal 2-2 to which the wireless telephone terminal 2-2 belongs until the attribution permission notice is sent from the wireless telephone terminal 2 for which the call control server function is enabled. The attribution request is repeatedly broadcasted to the network 4-1 a plurality of times (S109). Here, since the wireless telephone terminal 2-1 has enabled the call control server function, when receiving the attribution request, the attribution request notification is transmitted to the wireless telephone terminal 2-2 that is the transmission source of the attribution request ( S110).

  When receiving the attribution permission notification from the radio telephone terminal 2-1, the radio telephone terminal 2-2 registers the radio telephone terminal 2-1 as a call control server of the sub-extension telephone system 1-1. Also, a registration request including the extension number and address information of the own wireless telephone terminal 2-2 is transmitted to the wireless telephone terminal 2-1 (S111).

  Receiving this, the radio telephone terminal 2-1 registers the extension number and address information of the radio telephone terminal 2-2 as terminal information for call control (S112).

  Thereafter, it is assumed that the wireless telephone terminal 2-3 receives an extension joining operation from the user (S113). In response to this, the wireless telephone terminal 2-3 is assigned the private telephone terminal 2-3 to which the wireless telephone terminal 2-3 belongs until the attribution permission notice is sent from the wireless telephone terminal 2 for which the call control server function is enabled. The attribution request is repeatedly broadcasted to the network 4-1 a plurality of times (S114). Here, since the wireless telephone terminal 2-1 has enabled the call control server function, when the attribution request is received, an attribution permission notification is transmitted to the radio telephone terminal 2-3 that is the transmission source of the attribution request ( S115).

  When receiving the attribution permission notification from the radio telephone terminal 2-1, the radio telephone terminal 2-3 registers the radio telephone terminal 2-1 as a call control server of the sub-extension telephone system 1-1. Also, a registration request including the extension number and address information of the own wireless telephone terminal 2-3 is transmitted to the wireless telephone terminal 2-1 (S116).

  In response, the wireless telephone terminal 2-1 registers the extension number and address information of the wireless telephone terminal 2-3 as terminal information for call control (S117).

  As described above, the sub-extension telephone system 1-1 is constructed between the radio telephone terminals 2-1 to 2-3 belonging to the same private network 4-1, using the radio telephone terminal 2-1 as a call control server. .

  FIG. 3 is a sequence diagram for explaining an example of the bridge connection operation of the sub-extension telephone system 1 in the present embodiment.

  In the sub-extension telephone system 1-1, the radio telephone terminal 2-2 is a bridge with designation of address information (for example, telephone number) of the radio telephone terminal 2-5 of another sub-extension telephone system 1-2 in the SMS network 7. When the operation is accepted from the user (S120), the bridging function of the own wireless telephone terminal 2-2 is enabled (active setting) (S121).

  Then, the radio telephone terminal 2-2 performs a procedure according to the STUN protocol for the STUN server 8 on the communication packet network 5 (S122), and the address information on the communication packet network 5 necessary for the bridge connection. (Global IP address, port number) is acquired from the STUN server 8 (S123).

  Thereafter, the wireless telephone terminal 2-2 transmits the own wireless telephone terminal 2 acquired from the STUN server 8 to the wireless telephone terminal 2-5 specified by the address information designated by the user's bridge operation via the SMS network 7. -2 is sent and an address active notification including an arbitrary secret code generated using a random number or the like is transmitted (S124).

  In the sub extension telephone system 1-2, when the radio telephone terminal 2-5 receives the address active notification from the radio telephone terminal 2-2 via the SMS network 7, the bridge function of the own radio telephone terminal 2-5 is enabled ( passive setting) (S125).

  Then, the radio telephone terminal 2-5 performs the procedure according to the STUN protocol for the STUN server 8 on the communication packet network 5 (S126), and the address information on the communication packet network 5 necessary for the bridge connection. (Global IP address, port number) is acquired from the STUN server 8 (S127).

  Thereafter, the radio telephone terminal 2-5 sends the address information of the own radio telephone terminal 2-5 acquired from the STUN server 8 to the radio telephone terminal 2-2 that is the transmission source of the address active notification via the SMS network 7. Then, an address passive notification including an arbitrary secret code generated using a random number or the like is transmitted (S128).

  Next, the radio telephone terminal 2-5 is identified by the address information included in the address active notification acquired from the radio telephone terminal 2-2 via the SMS network 7 via the communication packet network 5. In 2-2, the address information of the own radiotelephone terminal 2-5 acquired from the STUN server 8 and the secret code included in the address active notification acquired from the radiotelephone terminal 2-2 via the SMS network 7 The bridge connection request is transmitted until the bridge connection confirmation is sent from the radio telephone terminal 2-2 (S129).

  Similarly, when the wireless telephone terminal 2-2 receives the address passive notification from the wireless telephone terminal 2-5 via the SMS network 7, the address passive acquired from the wireless telephone terminal 2-5 via the communication packet network 5 is received. The radio telephone terminal 2-5 specified by the address information included in the notification is sent to the address information of the own radio telephone terminal 2-2 acquired from the STUN server 8 and from the radio telephone terminal 2-5 via the SMS network 7. A bridge connection request including the secret code included in the acquired address passive notification is transmitted until a bridge connection confirmation is sent from the radio telephone terminal 2-5 (S130).

  When the wireless telephone terminal 2-2 receives the bridge connection request from the wireless telephone terminal 2-5 via the communication packet network 5, the secret code included in the bridge connection request is received by the own wireless telephone terminal 2-2. After confirming that it matches the secret code included in the address active notification transmitted to the radio telephone terminal 2-5 via the SMS network 7, a bridge connection confirmation is transmitted to the radio telephone terminal 2-5 (S131). Then, it waits for a bridge connection confirmation from the radio telephone terminal 2-5.

  On the other hand, when the radio telephone terminal 2-5 receives the bridge connection request from the radio telephone terminal 2-2 via the communication packet network 5, the secret code included in the bridge connection request is changed to the own radio telephone terminal 2- 5 is confirmed to match the secret code included in the address passive notification transmitted to the wireless telephone terminal 2-2 via the SMS network 7, and a bridge connection confirmation is transmitted to the wireless telephone terminal 2-2 (S132). After transmitting the bridge connection confirmation from the wireless telephone terminal 2-2, the wireless telephone terminal 2-5 functions as a call control server in the sub-extension telephone system 1-2 in which the wireless telephone terminal 2-5 participates. A bridge registration request including address information (private IP address, port number) on the private network 4-2 used for bridge connection is transmitted to the radio telephone terminal 2-4 (S133). Receiving this, the radio telephone terminal 2-4 registers the address information included in the bridge registration request as the address information of the bridge registration terminal (S134).

  The wireless telephone terminal 2-2 that has received the bridge connection confirmation from the wireless telephone terminal 2-5 within a predetermined time is used as a call control server in the sub-extension telephone system 1-1 in which the own wireless telephone terminal 2-2 participates. A bridge registration request including address information (private IP address, port number) on the private network 4-1 used for bridge connection is transmitted to the functioning wireless telephone terminal 2-1 (S135). Receiving this, the radio telephone terminal 2-1 registers the address information included in the bridge registration request as the address information of the bridge registration terminal (S136).

  As described above, the sub-extension telephone system 1-1 and the sub-extension telephone system 1-2 are bridge-connected via the radio telephone terminal 2-2 and the radio telephone terminal 2-5.

  FIG. 4 is a sequence diagram for explaining an example of an extension outgoing / incoming operation of the extension telephone system according to the present embodiment.

  In the sub-extension telephone system 1-1, when the radio telephone terminal 2-3 accepts a call operation with designation of the extension number of the radio telephone terminal 2-6 from the user (S140), the media port used for transmission / reception of the call data After that, a connection request with the extension number as the callee number and the extension number of the own radiotelephone terminal 2-3 as the caller number is transmitted to the radiotelephone terminal 2-1 as the call control server (S141). ). This connection request includes address information of a media port established by the radio telephone terminal 2-3 as media information used for transmission / reception of call data. When the wireless telephone terminal 2-1 receives the connection request from the wireless telephone terminal 2-3, the transmission destination number specified in the connection request is the sub-extension telephone system 1-managed by the own wireless telephone terminal 2-1. It confirms that the extension number is other than one of the wireless telephone terminals 2-1 to 2-3, and transmits this connection request to the wireless telephone terminal 2-2 which is a bridge registration terminal (S142).

  Next, when the wireless telephone terminal 2-2 receives a connection request from the wireless telephone terminal 2-1 as a call control server as a bridge registration terminal, the wireless telephone terminal 2-2 activates the media gateway (MGW) (S143). The media gateway opens media ports on the sub-extension telephone system 1-1 side and the communication packet network 5 side, and relays the call data by connecting the two media ports. Then, the radio telephone terminal 2-2 takes out the address information included in the media information in the connection request, and sets it as the transmission / reception destination address information of the media port on the sub-extension telephone system 1-1 side of the media gateway. At the same time, the address information included in the media information is converted into the address information of the media port on the communication packet network 5 side of the gateway. Then, the radio telephone terminal 2-2 transmits a connection request in which this address information is converted to the radio telephone terminal 2-5 of the bridge connection partner via the communication packet network 5 (S144).

  In the sub-extension telephone system 1-2, when the wireless telephone terminal 2-5 receives a connection request from the wireless telephone terminal 2-2 as a bridge connection partner via the communication packet network 5, the wireless telephone terminal 2-5 activates a media gateway (MGW) ( S145). The media gateway opens media ports on the sub-extension telephone system 1-2 side and the communication packet network 5 side, and relays the call data by connecting the two media ports. Next, the radio telephone terminal 2-5 extracts the address information included in the media information in this connection request, sets this as the destination address information of the media port on the communication packet network 5 side of the media gateway, and this connection The address information included in the requested media information is converted into address information of the media port on the sub-extension telephone system 1-2 side of the gateway. Then, the wireless telephone terminal 2-2 transmits the connection request in which the address information is converted to the wireless telephone terminal 2-4 that is a call control server (S146). When the wireless telephone terminal 2-4 receives the connection request from the wireless telephone terminal 2-5, which is a bridge registration terminal, the destination number specified in the connection request is the sub-phone managed by the wireless telephone terminal 2-4. After confirming that it is the extension number of the radio telephone terminal 2-6 of the extension telephone system 1-2, this connection request is transmitted to the radio telephone terminal 2-6 (S147).

  The wireless telephone terminal 2-6 starts ringing when receiving a connection request from the wireless telephone terminal 2-4 as a call control server (S148). Then, the radio telephone terminal 2-6 transmits a call notification to the radio telephone terminal 2-4 which is a call control server (S149). The radio telephone terminal 2-4 transmits the call notification received from the radio telephone terminal 2-6 to the radio telephone terminal 2-5 (S150). Receiving this, the radio telephone terminal 2-5 transmits this call notification to the radio telephone terminal 2-2 as the bridge connection partner via the communication packet network 5 (S151).

  In the sub extension telephone system 1-1, when the radio telephone terminal 2-2 receives the call notification from the radio telephone terminal 2-5 as the bridge connection partner via the communication packet network 5, the call notification is sent to the call control server. The data is transmitted to a certain radio telephone terminal 2-1 (S152). When receiving the call notification from the wireless telephone terminal 2-2 that is the bridge registration terminal, the wireless telephone terminal 2-1 transmits this call notification to the wireless telephone terminal 2-3 that is the connection request source (S153). In response to this, the radio telephone terminal 2-3 outputs a ringback tone (RBT) (S154).

  Next, in the sub-extension telephone system 1-2, when the radio telephone terminal 2-6 receives a response operation from the user (S155), the radio telephone terminal 2-6 opens a media port used for transmission / reception of call data, and then the call control server. A connection response is transmitted to a certain radio telephone terminal 2-4 (S156). This connection response includes address information of a media port established by the radio telephone terminal 2-6 as media information used for transmission / reception of call data. The wireless telephone terminal 2-4 transmits the connection response received from the wireless telephone terminal 2-6 to the wireless telephone terminal 2-5 (S157). In response to this, the radio telephone terminal 2-5 extracts the address information included in the media information in the connection response, and uses this as the transmission / reception destination address of the media port on the sub-extension telephone system 1-2 side of the media gateway. The information is set as information, and the address information included in the media information is converted into address information of the media port on the communication packet network 5 side of the gateway. Then, the radio telephone terminal 2-5 transmits the connection response in which this address information is converted to the radio telephone terminal 2-2 of the bridge connection partner via the communication packet network 5 (S158).

  Next, in the sub-extension telephone system 1-1, when the radio telephone terminal 2-2 receives a connection response from the radio telephone terminal 2-5 of the bridge connection partner via the communication packet network 5, the media in the connection response The address information included in the information is taken out and set as the transmission / reception destination address information of the media port on the communication packet network 5 side of the media gateway, and the address information included in the media information is set as the sub extension telephone of the gateway. It is converted into address information of the media port on the system 1-1 side. Then, the radio telephone terminal 2-2 transmits a connection response in which this address information is converted to the radio telephone terminal 2-1 that is a call control server (S159). When receiving the connection response from the wireless telephone terminal 2-2 that is the bridge registration terminal, the wireless telephone terminal 2-1 transmits this connection response to the wireless telephone terminal 2-3 that is the connection request source (S160).

  As described above, a communication path is established between the wireless telephone terminal 2-3 as a call originator and the wireless telephone terminal 2-6 as a call destination via the wireless telephone terminals 2-2 and 2-5 functioning as media gateways. It is established (S161, S162).

  Next, details of the radio telephone terminal 2 will be described. Since the mobile router 3 can use an existing device, a detailed description thereof is omitted.

  FIG. 5 is a schematic functional configuration diagram of the radio telephone terminal 2.

  As shown in the figure, the radio telephone terminal 2 includes a radio interface unit 200, a man-machine interface unit 201, a PN communication unit 202, an IP telephone network communication unit 203, an SMS network communication unit 204, and an MGW processing unit 205. STUN client processing unit 206, IP telephone function unit 207, call control server function unit 208, bridge function unit 209, and main control unit 210.

  The wireless interface unit 200 is an interface for wireless communication with the communication packet network 5, the IP telephone network 6, and the SMS network 7.

  The man-machine interface unit 201 is an interface for a user to perform telephone calls and various operations. Although not shown, the man-machine interface unit 201 includes an operation unit such as a microphone, a speaker, a dial key, and a display such as an LCD and an LED. Prepare.

  The PN communication unit 202 controls communication with other wireless telephone terminals 2 participating in the same private network 4 as the own wireless telephone terminal 2 via the wireless interface unit 200 and the mobile router 3.

  The IP telephone network communication unit 203 controls communication with the IP telephone network 6 via the wireless interface unit 200.

  The SMS network communication unit 204 controls communication with the SMS network 7 via the wireless interface unit 200.

  The MGW processing unit 205 performs processing for connecting the communication path of the wireless telephone terminal 2 (including the own wireless telephone terminal 2) in the sub-extension telephone system 1 in which the own wireless telephone terminal 2 participates to the communication packet network 5. . Thereby, a function as a media gateway is realized.

  The STUN client processing unit 206 performs a procedure according to the STUN protocol for the STUN server 8 on the communication packet network 5 to obtain address information (global IP address, port number) on the communication packet network 5 necessary for bridge connection. ) Is acquired from the STUN server 8.

  The IP telephone function unit 207 performs processing necessary for realizing the function of the IP telephone. Specifically, in accordance with a call control protocol such as SIP (Session Initiation Protocol), a call path is exchanged with a communication partner (IP telephone network 6 or other wireless telephone terminal 2) via a call control server. Establish and release Further, according to a transmission protocol such as RTP (Realtime Transport Protocol), a voice signal input by the user through the man-machine interface unit 201 is encoded into call data, and the call data is transmitted to the partner terminal via the call path. At the same time, call data is received from the partner terminal via the call path, and the call data is decoded into an audio signal and output from the man-machine interface unit 201 as audio.

  The call control server function unit 208 performs processing necessary to realize the function of the call control server. Specifically, the external telephone number and the own radio telephone of the sub-extension telephone system 1 in which the own radio telephone terminal 2 participates in the IP telephone network 6 (specifically, a call control server (not shown) on the IP telephone network 6). A registration request including the address information of the terminal 2 is transmitted to register the own radiotelephone terminal 2 in the IP telephone network 6. In addition, a call control message exchanged between any wireless telephone terminal 2 including its own wireless telephone terminal 2 and the other party (IP telephone network 6 or another wireless telephone terminal 2) in accordance with a call control protocol such as SIP. Is established, a communication path is established between the two, or a communication path established between the two is released.

  The bridge function unit 209 bridges with the radio telephone terminal 2 of the sub extension telephone system 1 other than the sub extension telephone system 1 in which the own radio telephone terminal 2 participates in cooperation with the SMS network communication unit 204 and the STUN client processing unit 206. To perform the necessary processing.

  The main control unit 210 comprehensively controls each unit 200 to 209 of the own wireless telephone terminal 2. The main control unit 210 also controls the subscription of the own radiotelephone terminal 2 to the extension telephone system and the bridge connection.

  FIG. 6 is a flowchart for explaining the operation of joining the radio telephone terminal 2 to the extension telephone system. This flow is started by accepting an extension joining operation from the user via the man-machine interface unit 201.

  First, the main control unit 210 instructs the PN communication unit 202 to transmit an attribution request. In response to this, the PN communication unit 202 broadcasts the belonging request to the private network 4 to which the own wireless telephone terminal 2 belongs via the wireless interface unit 200 (S200). If the attribution permission notification, which is a response to the attribution request, has not been received within the predetermined time (NO in S201), if the attribution request has not been transmitted a predetermined number of times (NO in S202), the process returns to S200 to request the attribution request. Will be broadcast again.

  On the other hand, when the attribution permission notification is received within the predetermined time in S201 (YES in S201), the PN communication unit 202 notifies the main control unit 210 of the transmission source address of the attribution permission notification. In response to this, the main control unit 210 notifies the IP telephone function unit 207 of the transmission source address of the attribution permission notification and instructs to join the extension telephone system.

  When the IP telephone function unit 207 is instructed to join the extension telephone system by the main control unit 210, the IP telephone function unit 207 uses the source address of the notification of permission permission received from the main control unit 210 as the call control server (enables the call control server function). Registered as the address of the wireless telephone terminal 2). In addition, a registration request is transmitted to the wireless telephone terminal 2 specified by the address of the call control server via the PN communication unit 202 and the wireless interface unit 200 (S204).

  In S202, when the attribution request has been transmitted a predetermined number of times (YES in S202), the PN communication unit 202 notifies the main control unit 210 of a timeout for receiving the attribution permission notification. In response, the main control unit 210 sets the call control server function to be valid (S205) and activates the call control server function unit 208.

  When the call control server function unit 208 is activated by the main control unit 210, first, the IP telephone network 6 (specifically, the diagram on the IP telephone network 6) is connected via the IP telephone network communication unit 203 and the wireless interface unit 200. A registration request including the external line number of the sub-extension telephone system 1 and the address information of the own radio telephone terminal 2 is transmitted to the call control server (not shown), and the own radio telephone terminal 2 is registered in the IP telephone network 6 (S206). ).

  When the call control server function unit 208 receives the completion notification from the IP telephone network 6, the call control server function unit 208 notifies the main control unit 210 of the completion of registration, and the main control unit 210 automatically transmits the notification via the PN communication unit 202 and the wireless interface unit 200. A server activation notification is broadcast to the private network 4 to which the wireless telephone terminal 2 belongs (S207). Further, the main control unit 210 registers terminal information including the extension number of the own radiotelephone terminal 2 and address information on the private network 4 in the call control server function unit 208 as terminal information for call control (S208). .

  Then, the main control unit 210 registers the address information of the own radiotelephone terminal 2 on the private network 4 as the address of the call control server in the IP telephone function unit 207 (S209).

  FIG. 7 is a flowchart for explaining the bridge connection operation of the wireless telephone terminal 2.

  The main control unit 210 receives, from the user via the man-machine interface unit 201, a radio telephone terminal 2 (bridge) participating in the sub-extension telephone system 1 other than the sub-extension telephone system 1 in which the own radio telephone terminal 2 is participating. When a bridge operation accompanied by designation of address information (for example, telephone number) on the connection partner) SMS network 7 is accepted (YES in S220), the bridge function unit 209 is enabled (active setting) (S221) and accepted from the user. Address information on the SMS network 7 of the bridge connection partner designated by the bridge operation is passed to the bridge function unit 209.

  In response, the bridge function unit 209 instructs the STUN client processing unit 206 to acquire address information. The STUN client processing unit 206 executes a procedure in accordance with the STUN protocol, and the own radiotelephone terminal 2 is bridge-connected via the communication packet network 5 from the STUN server 8 on the communication packet network 5 via the wireless interface unit 200. Address information (global IP address, port number) on the communication packet network 5 necessary for bridge connection with the other party is acquired (S222).

  Next, the bridge function unit 209 generates an arbitrary secret code using a random number or the like, and generates an address active notification including this secret code and the address information acquired by the STUN client processing unit 206. Then, the information is transferred to the SMS network communication unit 204 together with the address information on the SMS network 7 of the bridge connection partner. The SMS network communication unit 204 transmits an address active notification to the wireless telephone terminal 2 of the bridge connection partner specified by the address information received from the main control unit 210 via the wireless interface unit 200 and the SMS network 7 (S223). .

  Next, the SMS network communication unit 204 receives the address passive notification from the radio telephone terminal 2 as the bridge connection partner via the SMS network 7 and the wireless interface unit 200, and passes this address passive notification to the bridge function unit 209. Further, the bridge function unit 209 receives a bridge connection request from the radio telephone terminal 2 of the bridge connection partner via the communication packet network 5 and the radio interface unit 200 (S224).

  Then, the bridge function unit 209 transmits the STUN client processing unit 206 to the wireless telephone terminal 2 of the bridge connection partner specified by the address information included in the address passive notification via the wireless interface unit 200 and the communication packet network 5. Transmits a bridge connection request including the address information acquired by the server and the secret code included in the address passive notification (S225).

  The bridge function unit 209 also includes a secret code included in the bridge connection request received from the bridge connection partner radio telephone terminal 2 and a secret code included in the address active notification transmitted to the bridge connection partner radio telephone terminal 2. The verification is performed using (S226). If the two secret codes do not match, it is determined that the verification has not been established (NO in S226), and this is notified to the main control unit 210. In response to this, the main control unit 210 performs predetermined error processing such as displaying an error message on the man-machine interface unit 201 (S231). On the other hand, if both of the secret codes match, it is determined that the verification has been established (YES in S226), and a bridge connection confirmation is transmitted to the radio telephone terminal 2 of the bridge connection partner via the radio interface unit 200 and the communication packet network 5. (S227).

  Then, the bridge function unit 209 waits for a bridge connection confirmation to be sent from the wireless telephone terminal 2 that is the bridge connection partner via the communication packet network 5 and the wireless interface unit 200 (S228). If the bridge connection confirmation is not received from the wireless telephone terminal 2 as the bridge connection partner within a predetermined time (NO in S228), the main control unit 210 is notified of this. In response to this, the main control unit 210 performs predetermined error processing such as displaying an error message on the man-machine interface unit 201 (S231). On the other hand, if the bridge connection confirmation is received from the radio telephone terminal 2 of the bridge connection partner within a predetermined time (YES in S228), the address information included in the address passive notification received from the radio telephone terminal 2 of the bridge connection partner Is registered as address information of the bridge connection partner (S229). Thereafter, the bridge function unit 209 acquires the address information on the private network 4 of the call control server from the IP telephone function unit 207, and is specified by the acquired address information via the PN communication unit 202 and the wireless interface unit 200. A bridge registration request including address information (private IP address and port number) on the private network 4 used for bridge connection is transmitted to the radio telephone terminal 2 (S230).

  When the SMS network communication unit 204 receives an address active notification from the SMS network 7 via the wireless interface unit 200 (YES in S232), the SMS network communication unit 204 passes this address active notification to the main control unit 210. In response to this, the main control unit 210 enables the bridge function unit 209 (passive setting) (S233), and passes an address active notification to the bridge function unit 209.

  In response, the bridge function unit 209 instructs the STUN client processing unit 206 to acquire address information. Then, the STUN client processing unit 206 executes a procedure according to the STUN protocol, and the own radiotelephone terminal 2 passes through the communication packet network 5 from the STUN server 8 on the communication packet network 5 via the radio interface unit 200. Address information (global IP address, port number) on the communication packet network 5 necessary for bridge connection with the bridge connection partner is acquired (S234).

  Next, the bridge function unit 209 generates an arbitrary secret code using a random number or the like, and generates an address passive notification including the secret code and the address information acquired by the STUN client processing unit 206. Then, this address passive notification is passed to the SMS network communication unit 204. The SMS network communication unit 204 transmits an address passive notification to the transmission source of the address active notification that is the wireless telephone terminal 2 that is the bridge connection partner, via the wireless interface unit 200 and the SMS network 7. Further, the bridge function unit 209 sends the STUN client processing unit 206 to the wireless telephone terminal 2 of the bridge connection partner specified by the address information included in the address active notification via the wireless interface unit 200 and the communication packet network 5. Transmits a bridge connection request including the address information acquired by the server and the secret code included in the address active notification (S235).

  Then, the bridge function unit 209 receives a bridge connection request from the radio telephone terminal 2 as a bridge connection partner via the communication packet network 5 and the radio interface unit 200 (S236). Then, the bridge function unit 209 performs verification using the secret code included in the bridge connection request and the secret code included in the address passive notification transmitted to the wireless telephone terminal 2 of the bridge connection partner ( S237). If the two secret codes do not match, it is determined that the verification has not been established (NO in S237), and that is notified to the main control unit 210. In response to this, the main control unit 210 performs predetermined error processing such as displaying an error message on the man-machine interface unit 201 (S242). On the other hand, if both of the secret codes match, it is determined that the verification has been established (YES in S237), and a bridge connection confirmation is transmitted to the radio telephone terminal 2 of the bridge connection partner via the radio interface unit 200 and the communication packet network 5. (S238).

  Then, the bridge function unit 209 waits for a bridge connection confirmation to be sent from the wireless telephone terminal 2 as the bridge connection partner via the communication packet network 5 and the wireless interface unit 200 (S239). If the bridge connection confirmation is not received from the wireless telephone terminal 2 as the bridge connection partner within a predetermined time (NO in S239), the main control unit 210 is notified of this. In response to this, the main control unit 210 performs predetermined error processing such as displaying an error message on the man-machine interface unit 201 (S242). On the other hand, if the bridge connection confirmation is received from the radio telephone terminal 2 as the bridge connection partner within a predetermined time (YES in S239), the address information included in the address active notification received from the radio telephone terminal 2 as the bridge connection partner Is registered as address information of the bridge connection partner (S240). Thereafter, the bridge function unit 209 obtains the address information on the private network 4 of the call control server from the IP telephone function unit 207, and the wireless specified by the address information via the PN communication unit 202 and the wireless interface unit 200. A bridge registration request including address information (private IP address, port number) on the private network 4 used for bridge connection is transmitted to the telephone terminal 2 (S241).

  FIG. 8 is a flowchart for explaining the call control server operation of the radio telephone terminal 2 in which the call control server function is set to be valid.

  When the call control server function unit 208 receives an attribution request from the wireless telephone terminal 2 belonging to the same private network 4 via the wireless interface unit 200 and the PN communication unit 202 (YES in S250), the call control server function unit 208 receives the attribution request transmission source radio. An attribution permission notification is transmitted to the telephone terminal 2 (S251), and a waiting for a registration request from the wireless telephone terminal 2 is waited (S252). If the registration request is received (YES in S252), the terminal information including the extension number of the wireless telephone terminal 2 and the address information on the private network 4 included in the registration request is registered as the terminal information for call control. (S253).

  Further, when the call control server function unit 208 receives a connection request from the radio telephone terminal 2 subject to call control via the wireless interface unit 200 and the PN communication unit 202 (YES in S254), it is designated by this connection request. The destination number is analyzed (S255). When the destination number is an external line number ("external line number" in S255), the call control server function unit 208 transmits this connection request to the IP telephone network 6 via the wireless interface unit 200, and transmits a connection request. An outside line transmission process is performed so that a speech path is formed between the original wireless telephone terminal 2 and the IP telephone network 6 (S256).

  If the destination number is the extension number of the call control target wireless telephone terminal 2 (“extension number of call control target” in S255), the call control server function unit 208 sends this connection request to the PN communication unit 202. And, via the wireless interface unit 200, to the wireless telephone terminal 2 specified by the transmission destination number, to the wireless telephone terminal 2 of the connection request transmission source and the wireless telephone terminal 2 specified by the transmission destination number, A call control procedure is performed so that a speech path is formed between the two (S257).

  When the destination number is an extension number of a wireless telephone terminal 2 other than the wireless telephone terminal 2 subject to call control (“extension number not subject to call control” in S255), the call control server function unit 208 performs bridge registration. It is determined whether a terminal exists (S258).

  When there is a bridge registration terminal (YES in S258), the call control server function unit 208 transmits this connection request to the bridge registration terminal via the PN communication unit 202 and the wireless interface unit 200, and the connection request transmission source. The wireless telephone terminal 2 and the bridge registration terminal are called so that a communication path is formed via the bridge registration terminal between the wireless telephone terminal 2 of the connection request transmission source and the wireless telephone terminal 2 specified by the destination number. A control procedure is performed (S259).

  On the other hand, when there is no bridge registration terminal (NO in S258), the call control server function unit 208 performs predetermined error processing such as returning a busy tone to the wireless telephone terminal 2 that is the connection request transmission source (S260).

  FIG. 9 is a flowchart for explaining the bridge relay operation of the radiotelephone terminal 2 in which the bridge function is set to be valid.

  When the wireless interface unit 200 receives a connection request from the wireless telephone terminal 2 that is a call control server as a bridge registration terminal (YES in S270), the wireless interface unit 200 passes the connection request to the bridge function unit 209. In response to this, the bridge function unit 209 activates the MGW processing unit 205 (S271) and also performs call control including this connection request between the call control server and the wireless telephone terminal 2 registered as the bridge connection partner. A series of call control messages exchanged according to the procedure is relayed (S272).

  Next, in the relay of a series of call control messages (S272), the bridge function unit 209 instructs the MGW processing unit 205 to relay the communication path if a connection response is received from the bridge connection partner (YES in S273). . In response to this, the MGW processing unit 205 relays the communication path established by exchanging a series of call control messages (S274).

  After that, when relaying a series of call control messages (S272), the bridge function unit 209 transmits a disconnection response to the bridge connection partner or receives a disconnection response from the bridge connection partner (YES in S275), and the MGW processing unit 205 Is stopped (S276).

  When the wireless interface unit 200 receives a connection request from the bridge connection partner via the communication packet network 5 (YES in S277), the wireless interface unit 200 passes the connection request to the bridge function unit 209. In response to this, the bridge function unit 209 activates the MGW processing unit 205 (S278). Further, a series of call control messages exchanged in the call control procedure including the connection request and connection response are relayed between the radio telephone terminal 2 functioning as a call control server and the bridge connection partner (S279).

  Next, when relaying a series of call control messages (S279), the bridge function unit 209 transmits a connection response to the bridge connection partner (YES in S280), and instructs the MGW processing unit 205 to relay the communication path. . In response to this, the MGW processing unit 205 relays the communication path established by exchanging a series of call control messages (S281).

  Thereafter, when relaying a series of call control messages (S279), the bridge function unit 209 transmits a disconnection response to the bridge connection partner or receives a disconnection response from the bridge connection partner (YES in S282), and the MGW processing unit 205 Is stopped (S283).

  The embodiment of the present invention has been described above.

  In this embodiment, an extension telephone system is constructed across different private networks 4 using a plurality of radio telephone terminals 2 having a call control server function and a bridge function. That is, for each private network 4, the call control server function of one of the wireless telephone terminals 2 belonging to the same private network 4 is enabled, and the same private network 4 is assigned to the wireless telephone terminal 2. The sub-extension telephone system 1 is constructed between the radio telephone terminals 2 belonging to the same private network 4 by executing the call control of each radio telephone terminal 2 belonging to. In addition, for each sub-extension telephone system 1, the bridging function of any one of the radio telephone terminals 2 constituting the sub-extension telephone system 1 is enabled, The wireless telephone terminal 2 in which the bridge function of the extension telephone system 1 is enabled is bridge-connected. Then, a call to the radio telephone terminal 2 of the other sub-extension telephone system 1 is sent to the radio telephone terminal 2 in which the call control server function of each sub-extension telephone system 1 is validated via the bridge connection. Relay to the radio telephone terminal 2 with the call control server function of the system 1 enabled. Thus, the extension telephone system is constructed by linking the sub-extension telephone systems 1 constructed in different private networks 4. Therefore, according to the present embodiment, it is possible to construct an extension telephone system between a plurality of wireless telephone terminals 2 belonging to different private networks 4 without specially installing a call control server.

  Further, in the present embodiment, the wireless telephone terminal 2 enables the bridge function when receiving a bridge operation from the operator with designation of the wireless telephone terminal 2 as a bridge connection partner belonging to a different private network 4. Set and transmit an address active notification including address information on the communication packet network 5 of the own radio telephone terminal 2 to the radio telephone terminal 2 of the bridge connection partner designated by this bridge operation via the SMS network 7; A bridge registration request is transmitted to the radio telephone terminal 2 in which the call control server function belonging to the same private network 4 is set to be valid. When an address active notification is received from the wireless telephone terminal 2 belonging to a different private network 4 via the SMS network 7, the bridge function is set to be effective, and the wireless telephone terminal 2 is connected to the own wireless telephone terminal 2. Address passive notification including address information on the communication packet network 5 is transmitted, and a bridge registration request is transmitted to the radio telephone terminal 2 in which the call control server function belonging to the same private network 4 is set to be valid. Therefore, according to the present embodiment, the user can bridge-connect with the bridge connection partner via the communication packet network 5 without inputting the address of the bridge connection partner on the communication packet network 5. Can be reduced.

  Further, in the present embodiment, since the radio telephone terminal 2 that enables the bridge function acquires the address information of the own radio telephone terminal 2 in the communication packet network 5 from the STUN server 8, bridge connection is established with each radio telephone terminal 2. Therefore, it is not necessary to obtain address information on the communication packet network 5 in advance. For this reason, allocation of address information on the communication packet network 5 can be saved.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, the radio telephone terminal in which the bridge function of any one radio telephone terminal 2 is enabled for each sub-extension telephone system 1 and the bridge function of other sub-extension telephone systems 1 is enabled. 2 and the communication packet network 5 via a bridge connection. However, the present invention is not limited to this. A plurality of wireless telephone terminals 2 in the same sub-extension telephone system 1 may enable the bridge function. Then, the radio telephone terminal 2 functioning as a call control server makes all radio telephone terminals that have enabled the bridging function in the sub-extension telephone system 1 under the control of the call to the radio telephone terminal 2 of the other sub-extension telephone system 1. 2 to send. In this case, it is necessary to perform multiple response processing or loop detection. For example, in the case of SIP, proxy operation described in Chapter 16 of RFC (Request For Comment) 3261 issued by IETF (Internet Engineering Task Face) Can be processed.

  In the above embodiment, the radio telephone terminal 2 that enables the bridging function acquires the address information of the own radio telephone terminal 2 in the communication packet network 5 from the STUN server 8, but the present invention is not limited to this. Not. Address information on the communication packet network 5 may be assigned to each wireless telephone terminal 2 in advance for bridge connection.

  In the above embodiment, the radio telephone terminal 2 with the bridging function enabled transmits / receives address information on the communication packet network 5 to / from the bridge connection partner via the SMS network 7, but the present invention is not limited to this. Not. What is necessary is just to transmit / receive the address information on the communication packet network 5 through other communication networks, such as a mobile telephone network and a PHS network.

  In the above embodiment, the wireless telephone terminal 2 enables the bridge function when a bridge operation is received from the operator, but the present invention is not limited to this. For example, the wireless telephone terminal 2 automatically enables the bridge function when registration to the call control server is completed, and bridge connection is performed using address information (for example, telephone number) of the bridge connection partner registered in advance. May start.

  In the above embodiment, the case where the wireless telephone terminal 2 with the call control server function enabled and the wireless telephone terminal 2 with the bridge function enabled are described as an example. However, the present invention is not limited to this. Not. The same radio telephone terminal 2 may enable both the call control server function and the bridge function. For example, one sub-extension telephone system 1 may be constructed by one radio telephone terminal 2.

  In the above embodiment, the case where the extension telephone terminal that constructs the extension telephone system is the wireless telephone terminal 2 has been described as an example. However, the extension telephone terminal may be a wired telephone terminal.

  In the above embodiment, the functional configuration of the radiotelephone terminal 2 shown in FIG. 5 is realized by an integrated logic IC such as ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array). Alternatively, it may be realized by software by a computer such as a DSP (Digital Signal Processor). Or, in a general-purpose computer such as a PC (Personal Computer), a PDA (Personal Digital Assistant), or a smart phone equipped with an auxiliary storage device such as a CPU, memory, HDD, DVD-ROM, and wireless communication device such as a wireless LAN adapter, It may be realized by the CPU loading a predetermined program from the auxiliary storage device onto the memory and executing it.

1, 1-1 to 1-2: Sub-extension telephone system, 2, 2-1 to 2-6: Radio telephone terminal, 3: Mobile router, 4, 4-1, 4-2: Private network, 5: Communication Packet network, 6: IP telephone network, 7: SMS network, 8: STUN server, 200: wireless interface unit, 201: man-machine interface unit, 202: PN communication unit, 203: IP telephone network communication unit, 204: SMS network Communication unit 205: MGW processing unit 206: STUN client processing unit 207: IP telephone function unit 208: Call control server function unit 209: Bridge function unit 210: Main control unit

Claims (5)

A telephone terminal that constitutes a predetermined telephone system with one or more,
Call control means for executing processing related to call control of the own telephone terminal and the other LAN terminal connected to the first LAN (Local Area Network) connected to the own telephone terminal;
Bridge means for performing a bridge connection between the first LAN and the second LAN;
Call control validity / invalidity setting means for setting validity / invalidity of the call control means;
Bridge valid / invalid setting means for setting validity / invalidity of the bridge means, and
The call control means includes
When the call control validity / invalidity setting means is set to be effective, processing related to call control of the own telephone terminal and the other telephone terminal connected to the first LAN is executed, and the second LAN A call control command related to the call control of the other telephone terminal connected to the other telephone terminal connected to the first LAN, the bridge means being enabled,
The bridging means includes
When the bridge valid / invalid setting means is valid, the bridge connection is performed between the first LAN and the second LAN, and the bridge is connected to the first LAN. Relaying a call control command received from another telephone terminal in which the call control means is enabled to another telephone terminal connected to the second LAN and in which the bridging means is enabled, When a call control command is received from another telephone terminal that is connected to the second LAN and in which the bridging means is enabled, the received call control command is connected to the first LAN. A telephone terminal that relays to another telephone terminal for which the call control means is set to be effective. The telephone terminal according to claim 1,
The bridge valid / invalid setting means includes:
When a bridge operation with designation of another telephone terminal connected to the second LAN is received from the operator, the bridging means is set to be effective and the other telephone terminal designated by the bridge operation is set. The call control means connected to the first LAN is notified that the address information of the own telephone terminal used for relaying the call control command is notified and the bridging means is enabled. Notify other phone terminals that are set,
When the other telephone terminal receives address information used for relaying a call control command from another telephone terminal connected to the second LAN and for which the bridging means is effectively set, the bridge means is Set to valid, notify the other telephone terminal of the address information of the own telephone terminal used for relaying the call control command, and connect to the first LAN that the bridging means is set to valid The telephone terminal is notified to another telephone terminal in which the call control means is enabled. The telephone terminal according to claim 2,
A telephone terminal, further comprising: address information acquisition means for acquiring address information of the own telephone terminal used for relaying the call control command from a predetermined server. A computer readable program,
The program causes the computer to function as a telephone terminal constituting one or more predetermined telephone systems,
The telephone terminal
Call control means for executing processing related to call control of the own telephone terminal and the other LAN terminal connected to the first LAN (Local Area Network) connected to the own telephone terminal;
Bridge means for performing a bridge connection between the first LAN and the second LAN;
Call control validity / invalidity setting means for setting validity / invalidity of the call control means;
Bridge valid / invalid setting means for setting validity / invalidity of the bridge means, and
The call control means includes
When the call control validity / invalidity setting means is set to be effective, processing related to call control of the own telephone terminal and the other telephone terminal connected to the first LAN is executed, and the second LAN A call control command related to the call control of the other telephone terminal connected to the other telephone terminal connected to the first LAN, the bridge means being enabled,
The bridging means includes
When the bridge valid / invalid setting means is valid, the bridge connection is performed between the first LAN and the second LAN, and the bridge is connected to the first LAN. Relaying a call control command received from another telephone terminal in which the call control means is enabled to another telephone terminal connected to the second LAN and in which the bridging means is enabled, When a call control command is received from another telephone terminal that is connected to the second LAN and in which the bridging means is enabled, the received call control command is connected to the first LAN. The program is relayed to another telephone terminal in which the call control means is effectively set. A method for constructing an extension telephone system using a plurality of telephone terminals,
The plurality of telephone terminals are provided with call control means for executing processing relating to call control between the connected telephone terminals and bridge means for executing bridge connection between the first LAN and the second LAN. ,
For each LAN, call control means of any telephone terminal is enabled, and the telephone terminal that has enabled the call control means performs call control of each telephone terminal connected to the first LAN. By constructing a sub-extension telephone system between telephone terminals connected to the first LAN,
For each sub-extension telephone system, the bridging means of any telephone terminal is enabled to bridge the telephone terminal that has enabled the bridging means and the telephone terminal that has enabled the bridging means of another sub-extension telephone system. Connect
A telephone terminal that enables the call control means of each sub-extension telephone system transmits a call control command for the telephone terminal of another sub-extension telephone system to a telephone terminal that enables the bridge means of the same sub-extension telephone system,
Causing the telephone terminal that has enabled the bridge function of the same sub-extension telephone system to transmit the call control command to the telephone terminal that has enabled the bridging means of the other sub-extension telephone system;
By causing the telephone terminal that has enabled the bridging means of the other sub-extension telephone system to transmit the call control command to the telephone terminal that has enabled the call control means of the other sub-extension telephone system, An extension telephone system construction method characterized in that an extension telephone system is constructed by linking telephone systems.

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