JP6385183B2 - Gateway device and call transfer method - Google Patents

Description

  The present invention relates to a gateway apparatus for connecting a private branch exchange and an Internet network and transferring a received call to a mobile terminal.

  As a background art of this technical field, “an object is to realize a telephone system that is low in cost and convenient for connecting an extension telephone to a mobile phone network. Subordinate IP telephones 20A to 20E are provided. An access point is provided in the SIP server 10, and the access point and a dual mobile phone for relay (hereinafter referred to as a relay terminal) 30A to 30C are wirelessly connected to the mobile phone that communicates with the mobile phone network. A communication unit and a WLAN communication function unit that communicates with an access point. When these mobile phone communication unit and WLAN communication function unit are operating in the relay mode, the IP telephones 20A to 20E are connected to the SIP server 10 and the relay. It is connected to the mobile phone network via the terminals 30A to 30C "(see summary).

JP 2010-41147 A

  In Patent Document 1, it is assumed that an IP telephone is connected to a mobile phone network via a SIP server and a relay terminal, and that the IP telephone and the SIP server are introduced. For this reason, in order to introduce the technology described in Patent Document 1, an IP telephone and a SIP server are newly installed in place of an existing telephone and an existing private branch exchange that use a telephone line such as an analog line or an ISDN line. It must be introduced and the introduction cost is high.

  For this reason, an object of the present invention is to provide a gateway device that realizes a low-cost connection between an existing telephone and a portable terminal using an extension telephone number.

  A typical example of the present invention is a gateway device that connects a private branch exchange to the Internet network and can be connected to a mobile terminal, and the private branch exchange includes a plurality of private branch exchanges that connect a plurality of telephone lines. A telephone interface connected to the first telephone or the gateway apparatus; an extension telephone number is assigned to the private branch exchange side line interface; and the gateway apparatus connects the portable terminal to the portable terminal communication. An interface, an Internet network communication interface that connects the Internet network, a gateway device side line interface that connects a telephone line connected to the private branch exchange side line interface, identification information of the gateway device side line interface, and the gateway Device side line interface Management information in which a correspondence with identification information of the mobile terminal to which an extension telephone number assigned to the private branch exchange side line interface connected to the private branch is assigned, and the gateway device side line interface is the private branch When a call from the first telephone connected to the exchange is received, the management information is referred to, the identification information of the portable terminal corresponding to the identification information of the gateway device side line interface that has received the call is specified, By transferring the received call to the portable terminal identified by the identification information of the identified portable terminal, the extension telephone number can be connected between the first telephone connected to the private branch exchange and the portable terminal. It is characterized by doing.

  The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows. That is, it is possible to provide a gateway device that realizes connection between an existing telephone and a portable terminal using an extension telephone number at a low cost.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a configuration diagram of a system of Example 1. FIG. 2 is a functional block diagram of a gateway device according to Embodiment 1. FIG. It is explanatory drawing of the allocation management table of Example 1. FIG. It is explanatory drawing of the state management table of Example 1. FIG. FIG. 6 is a sequence diagram of call forwarding processing by the gateway device 102 that has received a call from the analog telephone according to the first embodiment to a mobile terminal. FIG. 6 is a configuration diagram of a system according to a second embodiment. FIG. 10 is a sequence diagram of call forwarding processing by a gateway device that has received a call from an external telephone connected to the IP network of the second embodiment to a mobile terminal. FIG. 10 is a configuration diagram of a system according to a third embodiment. It is a sequence diagram of the transmission transfer process by the gateway apparatus which received the transmission from the portable terminal of Example 3 to a portable terminal. FIG. 10 is a sequence diagram of call forwarding processing when a call to a mobile terminal during a call according to the third embodiment is received from an IP network. FIG. 10 is a configuration diagram of a system according to a fourth embodiment. It is explanatory drawing of the management information before the change of Example 4. FIG. It is explanatory drawing of the management information after the change of Example 4. FIG. It is a sequence diagram of the management information update process by the gateway apparatus of Example 4. It is explanatory drawing of the management information in case there exists a portable terminal which can carry out radio | wireless communication and is not talking among the some portable terminals allocated to the certain extension telephone number of Example 5. FIG. It is explanatory drawing of the management information in case all the portable terminals allocated to the certain extension telephone number of Example 5 are calling. It is explanatory drawing of the management information in case all the portable terminals allocated to the certain extension telephone number of Example 5 cannot perform radio | wireless communication with a gateway apparatus. It is a sequence diagram of the audio | voice information transmission process by the gateway apparatus of Example 5. 10 is a flowchart of voice information transmission processing according to the fifth embodiment. It is explanatory drawing of the allocation management table of Example 6. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same operation, and therefore description thereof is omitted.

  Example 1 will be described with reference to FIGS. FIG. 1 is a configuration diagram of a system according to the first embodiment.

  The system of the present embodiment includes a gateway device 102, a private branch exchange (PBX) 103, analog telephones 104A and 104B, and portable terminals 105A to 105C. The analog telephones 104A and 104B are collectively referred to as an analog telephone (first telephone) 104, and the mobile terminals 105A to 105C are collectively referred to as a mobile terminal 105. The number of analog telephones 104 and the number of portable terminals 105 are not limited to the numbers shown in FIG.

  The gateway device 102 connects the IP network 101 and the PBX 103 to which an unillustrated external telephone (second telephone) is connected. The PBX 103 is connected to the analog telephones 104A and 104B via an existing telephone line (for example, an ISDN line or an analog telephone line) that is not an IP line used by an external telephone. In FIG. 1, an analog telephone 104 is described as an example, but the analog telephone 104 includes a telephone to which a digital line such as an ISDN line is connected.

  The PBX 103 has telephone line ports (private branch exchange side line interfaces) 111A to 111E that are interfaces for connecting telephone lines. The telephone line ports 111 </ b> A to 111 </ b> E are collectively referred to as a telephone line port 111. The number of telephone line ports 111 is not limited to the number shown in FIG.

  The telephone lines connected to the telephone line ports 111A to 111C are connected to the gateway apparatus 102, and the telephone line connected to the telephone line port 111D is connected to the analog telephone 104A. The telephone line connected to the telephone line port 111E is connected to the analog telephone 104B.

  The gateway apparatus 102 has telephone line ports (gateway apparatus side line interfaces) 208A to 208C, which are interfaces for connecting telephone lines. The telephone line ports 208A to 208C are collectively referred to as the telephone line port 208. The number of telephone line ports 208 is not limited to the number shown in FIG. A telephone line connected to the telephone line port 111A is connected to the telephone line port 208A, a telephone line connected to the telephone line port 111B is connected to the telephone line port 208B, and a telephone line port 111C is connected to the telephone line port 208C. A telephone line connected to is connected.

  The gateway device 102 is connected to the mobile terminal 105 wirelessly (for example, a wireless local area network (LAN)). For example, the mobile terminal 105 may be a smartphone, and a dedicated application for wirelessly communicating with the gateway device 102 may be installed in the mobile terminal 105.

  Here, extension telephone numbers are assigned to the telephone line ports 111A to 111E by the PBX 103. The extension “1001” is assigned to the telephone line port 111D, the extension “1002” is assigned to the telephone line port 111E, the extension “1003” is assigned to the telephone line port 111A, and the extension “1003” is assigned to the telephone line port 111B. 1004 "is assigned, and the extension" 1005 "is assigned to the telephone line port 111C.

  In the gateway apparatus 102, the correspondence between the identification information of the telephone line port 208 and the identification information of the portable terminal to which the extension telephone number assigned to the telephone line port 111 connected to the telephone line port 208 is assigned is registered. The management information 210 shown in FIG. 2 is stored. As the identification information of the telephone line port 208, at least one of the identification information of the telephone line port 208 itself and the extension telephone number assigned to the telephone line port 111 connected to the telephone line port 208 can be used.

  In FIG. 1, the telephone line port 208A is associated with the mobile terminal 105A, and the telephone line port 208A is connected to the telephone line port 111A to which the extension “1003” is assigned. Is assigned. Similarly, the telephone line port 208B and the portable terminal 105B are associated with each other, the extension “1004” is assigned to the portable terminal 105B, the telephone line port 208C and the portable terminal 105C are associated, and the portable terminal 105C is connected to the extension. “1005” is assigned.

  For example, the case where the analog telephone 104A makes a call to the extension “1003” will be described. The PBX 103 connects the analog telephone 104A and the telephone line port 208A of the gateway apparatus 102 by connecting the telephone line port 111D to which the analog telephone 104A is connected and the telephone line port 111A corresponding to the extension “1003”. As a result, the outgoing call from the analog telephone 104 </ b> A is transmitted to the gateway device 102.

  When the telephone line port 208A of the gateway apparatus 102 receives a call from the analog telephone 104, the gateway apparatus 102 refers to the management information 210 and sets the mobile terminal 105A corresponding to the telephone line port 208A (or extension “1003”). The specified outgoing call is wirelessly transferred to the specified mobile terminal 105A.

  As described above, the extension telephone number can be connected from the analog telephone 104A to the portable terminal 105A, and a call can be made between the analog telephone 104A and the portable terminal 105A. Further, the user only has to purchase the gateway device 102, and it is not necessary to newly introduce an IP phone and a SIP server in place of the existing analog phone 104 and PBX 103, and between the analog phone 104A and the portable terminal 105A. Connection by extension telephone number can be realized at low cost.

  Next, a case where the mobile terminal 105A transmits to the extension “1001” will be described. In this case, the management information 210 stored in the gateway device 102 needs to associate the identification information of the telephone line port 208 itself, the extension telephone number, and the identification information of the portable terminal 105. When the gateway apparatus 102 receives a call from the portable terminal 105A via radio, the gateway apparatus 102 refers to the management information 210, identifies the telephone line port 208A corresponding to the identification information of the portable terminal 105A, and calls the identified telephone line port 208A. By connecting to the line port 111C, a call from the portable terminal 105A is sent to the PBX 103.

  When the telephone line port 111C of the PBX 103 receives a call from the portable terminal 105A, the PBX 103 specifies the telephone line port 111D to which the extension “1001” of the connection destination of the received call is assigned. The PBX 103 connects the telephone line port 111C and the telephone line port 111D, so that the call from the portable terminal 105A is transferred to the analog telephone 104A.

  As described above, the extension telephone number can be connected from the portable terminal 105A to the analog telephone 104A, and a call can be made between the analog telephone 104A and the portable terminal 105A.

  FIG. 2 is a functional block diagram of the gateway apparatus 102 according to the first embodiment.

  The gateway device 102 includes a WAN (Wide Area Network) port 201, a wireless LAN port 202, a layer 2 switch 203, a main control unit 204, a memory 205, an IP / analog conversion unit 206, a BRI port 207, and telephone line ports 208A to 208C. Have

  The WAN port 201 is an interface (Internet network communication interface) for connecting the IP network 101. The wireless LAN port 202 is an interface (mobile terminal communication interface) for connecting the mobile terminal 105. In this embodiment, the gateway device 102 wirelessly communicates with the mobile terminal 105 via the wireless LAN port 202. For example, the gateway device 102 is connected to a wireless access point and wirelessly communicates with the mobile terminal 105 via the wireless access point. May be. In this method, the gateway device 102 has a communication interface with a wireless access point instead of the wireless LAN port 202, and the communication interface with the wireless access point corresponds to a mobile terminal communication interface.

  The layer 2 switch 203 executes layer 2 processing (for example, route selection processing) of data received from the WAN port 201 or the wireless LAN port 202 or data transmitted to the WAN port 201 or the wireless LAN port 202. The main control unit 204 is a processor that reads and writes data stored in the memory 205 as necessary, and executes various programs by executing a program (not shown) stored in the memory 205. The main control unit 204 controls input / output of signals between the layer 2 switch 203 and the IP / analog conversion unit 206.

  The memory 205 is a storage area for storing data. The memory 205 stores management information 210 including an allocation management table 211 and a state management table 212. In the assignment management table 211, the correspondence between the identification information of the telephone line port 208 and the identification information of the portable terminal 105 assigned to the extension telephone number assigned to the telephone line port 111 connected to the telephone line port 208 is registered. The The allocation management table 211 will be described in detail with reference to FIG. In the state management table 212, an belonging state indicating whether or not the mobile terminal 105 can communicate with the gateway device 102 and a call state indicating whether or not the mobile terminal 105 is busy are registered. The state management table 212 will be described in detail with reference to FIG.

  The IP / analog conversion unit 206 converts the IP data input from the main control unit 204 into an analog signal (voice data), outputs the analog signal (voice data), and outputs the analog signal (voice) input from the phone line port 208. Data) to IP data and output to the main control unit 204.

  Data input from the IP / analog converter 206 to the main controller 204 is transferred from the layer 2 switch 203 via the WAN port 201 to the IP network 101 or from the layer 2 switch 203 via the wireless LAN port 202 to the portable terminal 105. Is output. Further, data input from the IP / analog conversion unit 206 to the main control unit 204 may be output from the BRI port 207 to the PBX 103.

  The BRI port 207 is an interface to which a digital telephone line such as ISDN is connected, and is a kind of telephone line interface. A telephone line port 208 is an interface to which an analog telephone line is connected.

  FIG. 3 is an explanatory diagram of the allocation management table 211 according to the first embodiment.

  The assignment management table 211 includes a telephone line port 301, an extension telephone number 302, a portable terminal 303, and a portable telephone number 304.

  In the telephone line port 301, identification information (for example, a port number) of the telephone line port 208 itself is registered. In the extension telephone number 302, the extension telephone number assigned to the telephone line port 111 to which the telephone line port 208 is connected is registered. When connecting from the analog telephone 104 to the portable terminal 105 with an extension telephone number, if either the telephone line port 301 or the extension telephone number 302 is registered in the assignment management table 211 as the identification information of the telephone line port 208, However, it is desirable that both the telephone line port 301 and the extension telephone number 302 are registered.

  Identification information (for example, user ID, user name, etc.) of the user of the portable terminal 105 is registered in the portable terminal 303. In the mobile phone number 304, a phone number that is not the extension phone number of the mobile terminal 105 is registered. The mobile terminal 303 and the mobile phone number 304 are identification information of the mobile terminal 105, and if either the telephone line port 301 or the extension telephone number 302 is registered in the assignment management table 211 as the identification information of the mobile terminal 105. Good.

  FIG. 4 is an explanatory diagram of the state management table 212 according to the first embodiment.

  The state management table 212 includes a telephone line port 401, a portable terminal 402, an belonging state 403, and a call state 404.

  In the telephone line port 401, identification information of the telephone line port 208 itself is registered. In the portable terminal 402, identification information of the user of the portable terminal 105 is registered. In the attribution state 403, information indicating whether or not the mobile terminal 105 is capable of wireless communication with the gateway device 102 is registered. For example, if the portable terminal 105 can wirelessly communicate with the gateway device 102, “Attribution” is registered in the attribution state 403. In the call state 404, information indicating whether or not the portable terminal 105 is busy is registered. For example, if the mobile terminal 105 is in a call, “in call” is registered in the call state 404.

  Information registered in the allocation management table 211 may be input in advance by the user via a computer or the like connected to the gateway apparatus 102. Further, the gateway device 102 may acquire the belonging state and the call state of the mobile terminal 105 at a predetermined timing, and update the allocation management table 211 based on the acquired belonging state and the call state.

  3 and 4, the assignment management table 211 and the state management table 212 have been described as separate tables. However, the assignment management table 211 and the state management table 212 may be combined into one table.

  FIG. 5 is a sequence diagram of call forwarding processing by the gateway apparatus 102 that has received a call from the analog telephone 104A according to the first embodiment to the mobile terminal 105A.

  When a call is made from the analog telephone 104A to the extension “1003”, the telephone line port 208A receives a call from the analog telephone 104A via the PBX 103 (501). The main control unit 204 refers to the management information 210 (502), and acquires management information corresponding to the identification information of the telephone line port 208 that has received the call (503).

  Specifically, the main control unit 204 selects a record in the assignment management table 211 in which the extension telephone number of the connection destination of the received call is registered in the extension telephone number 302, and manages the information registered in the selected record Obtain as information. Further, the main control unit 204 selects a record of the allocation management table 211 in which the identification information of the telephone line port itself that received the call is registered in the telephone line port 301, and uses the information registered in the selected record as management information. You may get it. That is, the main control unit 204 acquires the identification information of the portable terminal 105 corresponding to the identification information of the telephone line port 208 that has received the call.

  Further, the main control unit 204 selects the record of the state management table 212 in which the identification information registered in the telephone line port 301 of the record acquired from the allocation management table 211 is registered in the telephone line port 401, and Information registered in the belonging state 403 and the call state 404 is acquired as management information. The main control unit 204 selects the record in which the identification information registered in the portable terminal 303 of the record acquired from the allocation management table 211 is registered in the portable terminal 402 and registers it in the belonging state 403 and the call state 404 of the selected record. The obtained information may be acquired as management information. Any of the identification information of the telephone line port and the identification information of the portable terminal may be used as the search key as long as the belonging state and the call state corresponding to the connected portable terminal 105 can be acquired.

  In FIG. 5, since the extension telephone number is “1003”, the record of the first row of the allocation management table 211 and the record of the first row of the state management table 212 are acquired as management information.

  Next, when the mobile terminal 105A is in a belonging state in which wireless communication is possible and the mobile terminal 105A is not in a call, the main control unit 204 receives the received call by wirelessly connecting to the mobile terminal 105A. The outgoing call is transferred to the portable terminal 105A (504).

  In this case, the main control unit 204 updates the call state 404 of the record corresponding to the portable terminal 105A in the state management table 212 during a call (505).

  As described above, the analog telephone 104 and the PBX 103 can be connected from the analog telephone 104 to the portable terminal 105 by using the extension telephone number without replacing the IP telephone and the SIP server with the IP telephone and the SIP server. Connection by extension telephone number can be realized.

  A second embodiment will be described with reference to FIGS. 6 and 7. In the present embodiment, connection by extension telephone number from an external telephone connected to the IP network 101 to the portable terminal 105 will be described.

  FIG. 6 is a configuration diagram of a system according to the second embodiment. 6 that are the same as the configurations shown in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted.

  A case where a call is made from the external telephone to the extension “1003” via the IP network 101 will be described. The WAN port 201 of the gateway device 102 receives a call from an external telephone. Then, the gateway apparatus 102 refers to the assignment management table 211 and acquires the identification information of the mobile terminal 105A corresponding to the extension “1003”. Further, the gateway device 102 refers to the state management table 212 and acquires the belonging state and the call state of the mobile terminal 105A.

  Next, the gateway device 102 transfers the received call to the portable terminal 105A when the portable terminal 105A is capable of wireless communication with the gateway device 102 and is not in a call.

  As described above, the extension telephone number can be connected to the portable terminal 105 from the external telephone connected to the IP network 101.

  Since the extension telephone number is not assigned to the external telephone connected to the IP network 101, when making a call from the mobile terminal 105A to the IP telephone, the gateway device 102 receives the call from the wireless LAN port 202. The received call is transferred from the WAN port 201 to the external line telephone.

  FIG. 7 is a sequence diagram of call forwarding processing by the gateway apparatus 102 that has received a call from the external telephone connected to the IP network 101 according to the second embodiment to the mobile terminal 105A.

  When a call is made from the external telephone to the extension “1003” from the portable terminal 105, the WAN port 201 receives a call from the external telephone (701). Then, the main control unit 204 refers to the management information 210 (702), and acquires management information corresponding to the extension “1003” of the connection destination (703).

  Specifically, the main control unit 204 selects a record in the assignment management table 211 in which the extension telephone number of the connection destination of the received call is registered in the extension telephone number 302, and manages the information registered in the selected record Obtain as information.

  Further, the main control unit 204 selects a record in the state management table 212 in which information registered in the mobile terminal 302 of the record acquired from the allocation management table 211 is registered in the mobile terminal 402, and the attribution state 403 of the selected record. And the information registered in the call state 404 is acquired as management information. The main control unit 204 selects the record in which the identification information registered in the telephone line port 301 of the record acquired from the allocation management table 211 is registered in the telephone line port 401, and the belonging state 403 and the call state 404 of the selected record. The information registered in may be acquired as management information. Any of the identification information of the telephone line port and the identification information of the portable terminal may be used as the search key as long as the belonging state and the call state corresponding to the connected portable terminal 105 can be acquired.

  In FIG. 7, since the extension telephone number is “1003”, the record of the first line of the allocation management table 211 and the record of the first line of the state management table 212 are acquired as management information, as in FIG.

  Next, when the mobile terminal 105A is in the belonging state in which wireless communication is possible and the mobile terminal 105A is not in a call, the main control unit 204 closes the telephone line port 208A corresponding to the mobile terminal 105A and enters the off-hook state. (704). The telephone line port 208 </ b> A is identified by the information registered in the telephone line port 301 or the extension telephone number 302 acquired as management information from the allocation management table 211 in the process of step 703.

  Here, the effect of the processing in step 704 will be described. The outgoing connection from the external telephone to the portable terminal 105 is made without going through the PBX 103. For this reason, it is possible to make a call from the analog telephone 104 to the portable terminal 105 even though the external line telephone and the portable terminal 105 are busy. The gateway device 102 blocks outgoing calls from the analog telephone 104 to the mobile terminal 105 by closing the telephone line port 208 corresponding to the mobile terminal 105 connected to the analog telephone 104.

  Next, the main control unit 204 transfers the received call to the portable terminal 105A by wirelessly connecting the received call with the portable terminal 105A (705), and records corresponding to the portable terminal 105A in the state management table 212 The telephone call status 404 of the telephone is updated during the telephone call (706). Note that the main control unit 204 opens the telephone line port 208A after the call ends, and changes the telephone line port 208A from the off-hook state to the on-hook state.

  As described above, the extension telephone number from the external telephone to the portable terminal 105 can be obtained while enabling the connection from the analog telephone 104 to the portable terminal 105 without replacing the analog telephone 104 and the PBX 103 with the IP telephone and the SIP server. Since connection is possible, connection by extension telephone number from the external telephone to the portable terminal 105 can be realized at low cost.

  A third embodiment will be described with reference to FIGS. In the present embodiment, connection by extension telephone number from the mobile terminal 105A to the mobile terminal 105B will be described.

  FIG. 8 is a configuration diagram of a system according to the third embodiment. Of the configurations shown in FIG. 8, the same configurations as those shown in FIGS. 1 and 6 are given the same reference numerals, and descriptions thereof are omitted.

  A case where the mobile terminal 105A makes a call to the extension “1004” will be described. The wireless LAN port 202 of the gateway apparatus 102 receives a call from the portable terminal 105A. Then, the gateway apparatus 102 refers to the assignment management table 211 and acquires the identification information of the mobile terminal 105B corresponding to the extension “1004”. Further, the gateway apparatus 102 refers to the state management table 212 and acquires the belonging state and the call state of the mobile terminal 105B.

  Next, the gateway device 102 transfers the received call to the portable terminal 105B when the portable terminal 105B can communicate wirelessly with the gateway device 102 and is not in a call.

  As described above, the connection by the extension telephone number between the portable terminals 105 becomes possible.

  FIG. 9 is a sequence diagram of call forwarding processing by the gateway apparatus 102 that has received a call from the portable terminal 105A of the third embodiment to the portable terminal 105B.

  The portable terminal 105A transmits to the extension “1004” (901). The wireless LAN port 202 of the gateway apparatus 102 receives a call from the portable terminal 105A (902). The main control unit 204 refers to the management information 210 (903), and acquires management information corresponding to the extension “1004” of the connection destination. In the process of step 904, the identification information of the portable terminal 105B corresponding to the extension “1004”, the identification information of the telephone line port 208B itself corresponding to the portable terminal 105B, and the belonging state and call state of the portable terminal 105B are acquired (904). ). Since the specific description of the processing in steps 903 and 904 is the same as that in the second embodiment, description thereof is omitted.

  Next, when the mobile terminal 105B is in the belonging state in which wireless communication is possible and the mobile terminal 105B is not in a call, the main control unit 204 closes the telephone line port 208A corresponding to the mobile terminal 105A, and enters the off-hook state. (905).

  Here, a method in which the main control unit 204 acquires the identification information of the telephone line port 208A corresponding to the portable terminal 105A in order to close the telephone line port 208A will be described. The outgoing call from the mobile terminal 105A includes the identification information (at least one of the user identification information of the mobile terminal 105A and the mobile phone number of the mobile terminal 105A) of the source mobile terminal 105A. Here, a description will be given on the assumption that a mobile phone number is used as the identification information of mobile terminal 105A as the caller. The main control unit 204 refers to the allocation management table 211 and acquires the identification information registered in the telephone line port 301 of the record in which the mobile phone number of the mobile terminal 105A that is the outgoing connection destination is registered in the mobile phone number 304. . The telephone line port 208A identified by the identification information registered in the acquired telephone line port 301 is the telephone line port 208 corresponding to the portable terminal 105A.

  Next, the main control unit 204 closes the telephone line port 208B corresponding to the portable terminal 105B and puts it into an off-hook state (906). The telephone line port 208B is identified by the information registered in the telephone line port 301 or the extension telephone number 302 acquired as management information from the assignment management table 211 in the processing of step 904.

  Since connection from the portable terminal 105A to the portable terminal 105B is performed without going through the PBX 103, the telephone line port 208A corresponding to the caller portable terminal 105A and the telephone line port 208B corresponding to the connection destination portable terminal 105B are blocked. Then, the transmission from the analog telephone 104 to the portable terminals 105A and 105B is prohibited.

  Next, the main control unit 204 wirelessly transfers the received call to the portable terminal 105B (907), and updates the call state 404 of the record corresponding to the portable terminals 105A and 105B in the state management table 212 during a call ( 908). Note that the main control unit 204 opens the telephone line port 208A after the call ends, and changes the telephone line ports 208A and 208B from the off-hook state to the on-hook state.

  As described above, it is possible to connect from the analog telephone 104 to the portable terminal 105 by the extension telephone number without replacing the analog telephone 104 and the PBX 103 with the IP telephone and the SIP server, and to connect the portable telephones 105 by the extension telephone number. Therefore, the connection by the extension telephone number between the portable terminals 105 can be realized at low cost.

  FIG. 10 is a sequence diagram of a call forwarding process when a call to the mobile terminal 105A during a call according to the third embodiment is received from the IP network 101.

  The WAN port 201 receives a call from the external telephone connected to the IP network 101 to the extension “1003” (1001). The main control unit 204 refers to the management information 210 (1002) and acquires management information corresponding to the extension “1003” of the connection destination (1003). Steps 1002 and 1003 are the same as the processing of steps 702 and 703 shown in FIG.

  The call state corresponding to the mobile terminal 105A of the extension “1003” acquired as management information in the process of step 1003 is updated during the call in the process of step 908 shown in FIG. For this reason, the main control unit 204 does not transfer the received call to the mobile terminal 105 </ b> A, and sends voice information (for example, busy tone or voice guidance) indicating that the mobile terminal 105 is in a call via the WAN port 201. It transmits to the outside line telephone of the transmission source (1004).

  As described above, even when a call transmitted via the IP network 101 is received between the portable terminals 105 using the extension telephone number, the outside line telephone of the caller can be notified that the connection destination is busy. it can.

  A fourth embodiment will be described with reference to FIGS.

  In the first to third embodiments, the association between the extension telephone number and the mobile terminal 105 is not updated. However, in this embodiment, the gateway device 102 uses the extension state based on the belonging state of the mobile terminal 105. The association between the telephone number and the mobile terminal 105 is dynamically updated.

  FIG. 11 is a configuration diagram of a system according to the fourth embodiment. Among the configurations shown in FIG. 11, the same configurations as those shown in FIG. 1, FIG. 6, and FIG.

  In FIG. 11, a case where the analog telephone 104A transmits to the extension “1003” will be described. In this embodiment, the mobile terminal 105A cannot wirelessly connect to the gateway device 102, and the extension “1003” assigned to the mobile terminal 105A is assigned to the mobile terminal 105C. Different.

  As in FIG. 1, the telephone line port 208A of the gateway apparatus 102 receives a call from the analog telephone 104A. When the telephone line port 208A of the gateway apparatus 102 receives a call from the analog telephone 104, the gateway apparatus 102 refers to the management information 210, identifies the portable terminal 105C corresponding to the telephone line port 208A, and identifies the identified portable terminal. The outgoing call received at 105C is transferred wirelessly.

  As described above, when the mobile terminal 105A assigned to the extension “1003” cannot wirelessly communicate with the gateway device 102, the gateway device 102 assigns the extension “1003” to another mobile terminal 105C capable of wireless communication. Thereby, the outgoing call to the extension “1003” can be transferred to the other portable terminal 105C. This embodiment can be applied not only to the first embodiment but also to the second and third embodiments.

  Next, the management information 210 before and after the update will be described with reference to FIGS. 12A and 12B. FIG. 12A is an explanatory diagram of the management information 210 before update according to the fourth embodiment. FIG. 12B is an explanatory diagram of the management information 210 after the update according to the fourth embodiment.

  In the allocation management table 211 shown in FIG. 12A, the mobile terminal 105A and the mobile phone number “090-XXXX-0001” are associated with the telephone line port 208A and the extension telephone number “1003”, and the telephone line port 208B and the extension telephone The number “1004” is associated with the mobile terminal 105B and the mobile phone number “090-XXXX-0002”. In the state management table 212 shown in FIG. 12A, the belonging state of the mobile terminals 105A and 105B is wirelessly communicable with the gateway device 102, and the call state is not in a call.

  The gateway device 102 confirms the portable terminal 105 that can wirelessly communicate with itself at a predetermined timing, and when wireless communication with the portable terminal 105 that can wirelessly communicate becomes impossible, the wireless communication device 105 that cannot wirelessly communicate Cancel the assignment to an extension telephone number. In addition, when the mobile terminal 105 that has not been able to perform wireless communication becomes newly communicable, the gateway apparatus 102 is an extension that is not assigned to any of the mobile terminals 105 to the mobile terminal 105 that has become newly wireless communicable. Assign a phone number.

  Here, it is assumed that the mobile terminal 105 </ b> A cannot wirelessly communicate with the gateway device 102. In this case, the gateway apparatus 102 updates the mobile terminal 303 and the mobile phone number 304 of the record corresponding to the mobile terminal 105A in the allocation management table 211 to “−”, and the belonging state corresponding to the mobile terminal 105A in the state management table 212 403 is updated to “no attribution”, and the call state 404 is updated to “not busy”.

  After the gateway apparatus 102 updates the allocation management table 211 and the state management table 212, the gateway apparatus 102 detects that the mobile terminal 105C can newly perform wireless communication. In this case, the gateway apparatus 102 assigns the extension “1003” assigned to the mobile terminal 105A to the mobile terminal 105C.

  Specifically, the gateway device 102 refers to the assignment management table 211 and selects an extension telephone number that is not assigned to the mobile terminal 105. Here, the extensions “1003” and “1005” are selected, and the gateway apparatus 102 determines the extension “1003” as the extension telephone number to be assigned to the mobile terminal 105C. In addition, when there are a plurality of extension telephone numbers that are not assigned to the mobile terminal 105, for example, the plurality of extension telephone numbers that are present are prioritized on the basis of a predetermined rule (for example, the order of the extension telephone numbers is smaller). Alternatively, it may be assigned to the portable terminal 105 that is newly wirelessly connectable to the gateway device 102.

  Then, the gateway apparatus 102 registers “mobile terminal 105C” in the mobile terminal 303 of the record corresponding to the extension “1003” of the allocation management table 211, and the mobile phone number “mobile terminal 105C” of the mobile terminal 105C of the record. "090-XXXX-0003" is registered. As a result, the assignment management table 211 shown in FIG. 12B is obtained. Further, the gateway device 102 registers “portable terminal 105C” in the portable terminal 402 of the record corresponding to the extension “1003” (telephone line port 208A) of the state management table 212, and registers “affiliation” in the belonging state 403. Then, “not busy” is registered in the call state 404. As a result, a state management table 212 shown in FIG. 12B is obtained.

  FIG. 13 is a sequence diagram of management information update processing by the gateway apparatus 102 according to the fourth embodiment.

  First, the main control unit 204 confirms whether or not wireless communication is possible in an area where wireless communication is possible (1301). For example, when the main control unit 204 transmits a status confirmation request wirelessly and the mobile terminal 105 receives the status confirmation request, the main control unit 204 transmits a status confirmation response to the gateway device 102, and the main control unit 204 receives the status confirmation response. In this case, it is determined that wireless communication is possible with the mobile terminal 105 that has transmitted this state confirmation response. The main control unit 204 determines that the mobile terminal 105 is no longer able to perform wireless communication when the state confirmation response cannot be received within a predetermined time from the mobile terminal 105 capable of wireless communication.

  In FIG. 13, the main control unit 204 determines that the portable terminal 105 </ b> A capable of wireless communication cannot wirelessly communicate and has no attribution (1302).

  In this case, the main control unit 204 updates the assignment management table 211 and the state management table 212 in order to release the assignment of the portable terminal 105A that has become unable to perform wireless communication with the extension telephone number and update the belonging state without belonging. Management information update processing is executed (1303).

  Specifically, the main control unit 204 updates the mobile terminal 303 and the mobile phone number 304 of the record corresponding to the mobile terminal 105A in the allocation management table 211 to “−”, and sets the extension “1003” and the mobile terminal 105A. Release the assignment. Further, the main control unit 204 updates the portable terminal 402 of the record registered in the portable terminal 105A of the state management table 212 to “−”, updates the belonging state 403 to “no belonging”, and sets the call state 404 to “ Update to “-”.

  The main control unit 204 confirms whether or not the mobile terminal 105 is capable of wireless communication, as in the process of step 1301 (1304). Here, the main control unit 204 receives the state confirmation response from the mobile terminal 105C, and determines that the mobile terminal 105C can newly perform wireless communication (1305).

  In this case, the main control unit 204 executes management information update processing in order to newly assign an extension telephone number to the mobile terminal 105C that is newly capable of wireless communication, and to update the belonging state of the mobile terminal 105C with attribution. (1306).

  Specifically, the main control unit 204 updates the mobile terminal 303 of the record corresponding to the extension telephone number “1003” assigned to the mobile terminal 105A in the assignment management table 211 to “mobile terminal 105C”, and Is updated to “090-XXXX-0003” and the mobile terminal 105C is assigned to the extension “1003”. In addition, the main control unit 204 updates the portable terminal 402 of the record corresponding to the extension “1003” of the state management table 212 to “mobile terminal 105C”, updates the attribution state 403 to “attribute”, and sets the call state 404 to Update to "Not busy".

  Thereafter, when the mobile terminal 105A becomes capable of wireless communication with the gateway apparatus 102, the gateway apparatus 102 manages the management information 210 so that the extension “1005” that is not assigned to any of the mobile terminals 105 is assigned to the mobile terminal 105A. Update.

  As described above, the gateway device 102 cancels the assignment of the mobile terminal 105 that has become unable to perform wireless communication and the extension telephone number of the mobile terminal 105, and sets any mobile terminal to the mobile terminal 105 that is newly capable of wireless communication. An extension telephone number that is not assigned to 105 is also assigned. As a result, even when the mobile terminal 105 to which a certain extension telephone number is assigned becomes unable to wirelessly communicate with the gateway device 102, if the other mobile terminal 105 becomes capable of wireless communication, the extension telephone number Is assigned to another mobile terminal 105 that is capable of wireless communication, so that a call to a certain extension telephone number is transferred to the other mobile terminal 105, and there is a high possibility that a call to a certain extension telephone number can be handled. . As an application scene of this embodiment, for example, there is a call center.

  A fifth embodiment will be described with reference to FIGS. 14A to 16.

  In this embodiment, a plurality of portable terminals 105 are assigned to one extension telephone number. In this case, a guide number is associated with each of the plurality of mobile terminals 105 assigned to one extension telephone number. When the gateway apparatus 102 receives a call to the extension telephone number, the gateway apparatus 102 changes the voice information to be transmitted based on the belonging state and call state of the mobile terminal 105 assigned to the extension telephone number. When there is a mobile terminal 105 that is capable of wireless communication and is not in a call, the gateway device 102 transmits a guide number corresponding to the mobile terminal 105 as voice information. As a result, the gateway device 102 receives a call to a certain extension telephone number, and even if one portable terminal 105 assigned to the extension telephone number is talking or cannot communicate wirelessly, the other portable terminal 105 You can forward incoming calls.

  In the present embodiment, the configuration other than the management information 210 is the same as that of the first to fourth embodiments, and thus the description thereof is omitted.

  FIG. 14A is an explanatory diagram of the management information 210 when there is a mobile terminal 105 capable of wireless communication and not in a call among a plurality of mobile terminals 105 to which an extension telephone number is assigned according to the fifth embodiment.

  The assignment management table 211 of this embodiment includes a telephone line port 301, an extension telephone number 302, a guide number 1401, a portable terminal 303, and a portable telephone number 304. The telephone line port 301, extension telephone number 302, portable terminal 303, and portable telephone number 304 are the same as the assignment management table 211 shown in FIG.

  As shown in FIG. 14A, the extension telephone number “1003” of this embodiment is assigned to a plurality of portable terminals 105A to 105C. In the guide number 1401, guide numbers corresponding to the plurality of mobile terminals 105A to 105C assigned to the extension telephone number “1003” are registered. In FIG. 14A, the mobile terminal 105A is associated with the guide number “1”, the mobile terminal 105B is associated with the guide number “2”, and the mobile terminal 105C is associated with the guide number “3”.

  Further, in the status management table 212 shown in FIG. 14A, the belonging status 403 of all the mobile terminals 105A to 105C to which the extension telephone number “1003” is assigned indicates that wireless communication with the gateway apparatus 102 is possible. Further, the call state 404 of the mobile terminal 105A indicates that a call is in progress, and the call state 404 of the mobile terminals 105B and 105C indicates that the call is not in progress.

  In this case, when the WAN port 201, the wireless LAN port 202, or the telephone line port 208 of the gateway apparatus 102 receives a call to the extension telephone number “1003”, the gateway apparatus 102 refers to the allocation management table 211 and receives the call. The mobile terminals 105A to 105C to which the extension telephone number “1003” of the connection destination of the outgoing call is assigned are specified. Then, the gateway device 102 refers to the state management table 212 and acquires the belonging states and call states of the mobile terminals 105A to 105C.

  In FIG. 14A, since the mobile terminal 105A is in a call and the mobile terminals 105B and 105C are not in a call, the gateway apparatus 102 refers to the assignment management table 211 and refers to the guide number “1” "And" 2 "are acquired, and voice information notifying the acquired guide numbers" 1 "and" 2 "is transmitted. Specifically, the gateway device 102 transmits a voice guidance “Please press the number 2 or 3 after the dial tone.” When the corresponding number is pressed, "Please wait for a while."

  FIG. 14B is an explanatory diagram of the management information 210 when all mobile terminals 105 to which certain extension telephone numbers are assigned in the fifth embodiment are busy.

  The assignment management table 211 in FIG. 14B is the same as the assignment management table 211 shown in FIG.

  In the state management table 212 of FIG. 14B, the call states 404 of all the mobile terminals 105A to 105C to which the extension telephone number “1003” is assigned are busy.

  For this reason, when the gateway apparatus 102 receives a call to the extension telephone number “1003”, the gateway apparatus 102 transmits voice information notifying that all the mobile terminals 105A to 105C to which the extension telephone number “1003” is assigned are in a call. Send. Specifically, the gateway device 102 transmits a voice guidance saying “The line is currently busy, so please try again later.”

  FIG. 14C is an explanatory diagram of the management information 210 when all the mobile terminals 105 to which an extension telephone number is assigned in Example 5 cannot wirelessly communicate with the gateway device 102.

  The assignment management table 211 in FIG. 14C is the same as the assignment management table 211 shown in FIG.

  In the state management table 212 of FIG. 14C, the belonging states 403 of all the mobile terminals 105A to 105C to which the extension telephone number “1003” is assigned are not belonging.

  Therefore, when the gateway device 102 receives a call to the extension telephone number “1003”, the gateway device 102 notifies that all the mobile terminals 105A to 105C to which the extension telephone number “1003” is assigned cannot communicate with the gateway device 102. Send audio information. Specifically, the gateway device 102 transmits a voice guidance saying “I have just taken my seat. Please try again later.” In addition, when the time when the call is received outside the business hours, the gateway device 102 gives a voice guidance “Today's business has ended. Business hours are from X hours to Y hours.” You may send it.

  As described above, when the gateway apparatus 102 receives a call, the gateway apparatus 102 changes the voice information to be transmitted based on the belonging state and the call state of the plurality of mobile terminals 105 to which the extension telephone numbers are assigned. Thereby, the gateway apparatus 102 can transmit voice information appropriate for the belonging state and the call state of the plurality of mobile terminals 105 to which the extension telephone numbers are assigned.

  FIG. 15 is a sequence diagram of voice information transmission processing by the gateway device 102 according to the fifth embodiment.

  When a call is made from the external telephone to the extension “1003” from the portable terminal 105, the WAN port 201 receives a call from the external telephone (1501). FIG. 15 illustrates an example of a field call from an external telephone, but the telephone line port 208 may receive a call from the analog telephone 104 or a wireless LAN port 202 may receive a call from the portable terminal 105. Also good.

  The main control unit 204 refers to the management information 210 (1502) and acquires management information corresponding to the extension “1003” of the connection destination (1503). Specifically, the main control unit 204 acquires, as management information, the belonging states and call states of the mobile terminals 105A to 105C to which the extension “1003” is assigned.

  Next, the main control unit 204 determines voice information to be transmitted based on the acquired belonging state and call state, and transmits the determined voice information to the external telephone set as the caller (1504).

  FIG. 16 is a flowchart of audio information transmission processing according to the fifth embodiment.

  First, the main control unit 204 determines whether or not all the mobile terminals 105 to which the extension telephone number of the received outgoing connection destination is assigned belong to a state in which wireless communication with the gateway apparatus 102 is not possible (1601).

  If it is determined in step 1601 that all portable terminals 105 are in an belonging state incapable of wireless communication with the gateway apparatus 102, the main control unit 204 cannot perform wireless communication with the gateway apparatus 102 by all the portable terminals 105 </ b> A to 105 </ b> C. The voice information informing the effect (unconnectable voice information) is transmitted to the caller's external telephone (1602), and the voice information transmission process is terminated.

  On the other hand, if it is determined in step 1601 that the mobile terminal 105 to which the extension telephone number is assigned has the mobile terminal 105 in the belonging state capable of wireless communication with the gateway apparatus 102, the main control unit 204 It is determined whether or not all the mobile terminals 105 in the belonging state capable of wireless communication with the device 102 are busy (1603).

  If it is determined in step 1603 that all portable terminals 105 belonging to the gateway apparatus 102 that are wirelessly communicable with each other are busy, the main control unit 204 determines that all portable telephones assigned to the extension telephone number are used. The voice information that informs that the terminal 105 is in a call (voice information during a call) is transmitted to the caller's external telephone (1604), and the voice information transmission process is terminated.

  On the other hand, if it is determined in step 1603 that there is a mobile terminal 105 that is not in a call among the mobile terminals 105 that belong to the gateway apparatus 102 in a wireless communication state, the main control unit 204 refers to the allocation management table 211. Then, a guidance number corresponding to the portable terminal 105 that is not in a call is acquired, and voice information (guidance voice information) notifying the acquired guidance number is transmitted to the external telephone of the caller (1605), and the voice information transmission process is terminated. .

  As described above, one extension telephone number can be assigned to a plurality of portable terminals 105, and even if one portable terminal 105 assigned with the extension telephone number is in a call or cannot perform wireless communication, it can be assigned to another portable terminal 105. You can forward incoming calls. Moreover, since the voice information to be transmitted is changed based on the belonging state and the call state of the mobile terminal 105 assigned to the extension telephone number, it is possible to transmit appropriate voice information.

  Example 6 will be described with reference to FIG.

  In the present embodiment, the mail address of the mobile terminal 105 is registered in the assignment management table 211, and the gateway device 102 is in a case where the mobile terminal 105 corresponding to the received extension telephone number cannot be wirelessly communicated or in a call. Then, incoming call information for notifying that there is an incoming call to the mail address of the portable terminal 105 is transmitted. Thereby, it is possible to notify the user of the portable terminal 105 that there is an incoming call.

  FIG. 17 is an explanatory diagram of the allocation management table 211 of the sixth embodiment.

  The assignment management table 211 includes a telephone line port 301, an extension telephone number 302, a portable terminal 303, a portable telephone number 304, and a mail address 1701. The telephone line port 301, extension telephone number 302, portable terminal 303, and portable telephone number 304 are the same as the assignment management table 211 shown in FIG. In the mail address 1701, the mail address of the mobile terminal 105 is registered.

  For example, the management information corresponding to the received extension telephone number acquired by the main control unit 204 in the process of step 503 shown in FIG. 5 of the first embodiment also includes a mail address. Then, the main control unit 204 has received a call to the mail address of the mobile terminal 105 to which the extension telephone number is assigned when the belonging state indicates that wireless communication is not possible or when the call state indicates that a call is in progress Send incoming call information.

  Thereby, it is possible to notify the user of the portable terminal 105 that there is an incoming call.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  Each of the above-described configurations, functions, processing units, processing means, and the like may be realized by hardware by designing a part or all of them with, for example, an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files that realize each function can be stored in a recording device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

  In addition, control lines and information lines are those that are considered necessary for explanation, and not all control lines and information lines on the product are shown. In fact, almost all configurations are connected to each other. You may think that it is.

101 IP network 102 Gateway device 103 PBX
104A, 104B Analog telephones 105A-105C Mobile terminal 201 WAN port 202 Wireless LAN port 203 L2SW
204 Main Control Unit 205 Memory 206 IP / Analog Conversion Unit 207 BRI Ports 208A to 208C Telephone Line Port 210 Management Information 211 Assignment Management Table 212 Status Management Table

Claims (10)

A gateway device that connects a private branch exchange and the Internet network, and can be connected to a mobile terminal,
The private branch exchange is
It has multiple private branch exchange side line interfaces that connect multiple telephone lines,
The connection destination of the telephone line is the first telephone or the gateway device,
An extension telephone number is assigned to the private branch exchange side line interface,
The gateway device is
A mobile terminal communication interface for connecting the mobile terminal;
An internet network communication interface for connecting the internet network;
A gateway device side line interface for connecting a telephone line connected to the private branch exchange side line interface;
Correspondence between the identification information of the gateway device side line interface and the identification information of the portable terminal to which the extension telephone number assigned to the private branch exchange side line interface connected to the gateway device side line interface is registered is registered. Management information,
When the gateway device side line interface receives a call from the first telephone connected to the private branch exchange, the portable information device refers to the management information and corresponds to the identification information of the gateway device side line interface that has received the call. Identify your device ’s identification information,
By transferring the received call to the portable terminal identified by the identification information of the identified portable terminal, the extension telephone number can be connected between the first telephone connected to the private branch exchange and the portable terminal. A gateway device characterized by that. The gateway device according to claim 1,
A second telephone is connected to the Internet network. In the management information, an extension telephone assigned to the private branch exchange side line interface connected to the gateway apparatus side line interface as identification information of the gateway apparatus side line interface. Number is used,
When the Internet network communication interface receives a call from the second telephone including the extension telephone number of the connection destination, the mobile terminal refers to the management information and corresponds to the received extension telephone number of the connection destination Identify the identity of the
By transferring the received call to the mobile terminal identified by the identification information of the specified mobile terminal, connection by extension telephone number is possible between the second telephone connected to the Internet network and the mobile terminal A gateway device characterized by that. The gateway device according to claim 1,
In the management information, an extension telephone number assigned to the private branch exchange side line interface connected to the gateway apparatus side line interface is used as identification information of the gateway apparatus side line interface.
When the mobile terminal communication interface receives a call from the mobile terminal including the extension telephone number of the connection destination, the management information is referred to and the mobile terminal corresponding to the extension telephone number of the received connection destination is referred to. Identify identification information,
A gateway device characterized by enabling connection by an extension telephone number between the portable terminals by transferring the received call to a portable terminal identified by the identified identification information of the portable terminal. The gateway device according to claim 2 or 3, wherein
A gateway characterized in that, when a call is made to a mobile terminal identified by the specified identification information, the gateway interface on the gateway device side is blocked and a call from a telephone connected to the private branch exchange to the mobile terminal is prohibited. apparatus. The gateway device according to claim 3,
When the Internet network communication interface receives a call from the second telephone connected to the Internet network and including the extension telephone number of the connection destination, the management information is referred to and the received call Identify the identification information of the mobile terminal corresponding to the extension telephone number of the connection destination,
When the portable terminal identified by the identified identification information of the portable terminal is in a call, voice information indicating the fact is transmitted to the second telephone. The gateway device according to claim 1,
In the management information, an extension telephone number assigned to the private branch exchange side line interface connected to the gateway apparatus side line interface is used as identification information of the gateway apparatus side line interface.
The gateway apparatus characterized in that identification information of a portable terminal corresponding to the extension telephone number can be changed in the management information. The gateway device according to claim 1,
In the management information,
As the gateway device side line interface identification information, an extension telephone number assigned to the private branch exchange side line interface connected to the gateway device side line interface is used,
The gateway device, wherein the extension telephone number is associated with identification information of a plurality of portable terminals. The gateway device according to claim 7,
In the management information, a guide number is associated with each of identification information of a plurality of portable terminals associated with the extension telephone number,
The belonging state of whether or not the mobile terminal can communicate with the mobile terminal communication interface, and the call state of the mobile terminal are managed,
When any one of the mobile terminal communication interface, the Internet network communication interface, and the gateway device side line interface receives a call including the extension telephone number of the connection destination, the management information is referred to and the received call Identifying the belonging state of the plurality of mobile terminals and the call state identified by the identification information of the plurality of mobile terminals corresponding to the extension telephone number of the connection destination;
When there is a portable terminal that is in communication with the portable terminal communication interface and is not in a call, the belonging state specifies a guide number associated with the identification information of the portable terminal,
Voice information indicating the identified guide number is transmitted. The gateway device according to claim 1,
In the management information, an email address of the mobile terminal is also registered,
When the received call cannot be transferred to the mobile terminal identified by the identification information of the specified mobile terminal, the incoming information indicating that the call has been received is transmitted to the e-mail address of the specified mobile terminal. Gateway device. In a gateway device that connects a private branch exchange and the Internet network and can be connected to a mobile terminal, the call transfer method transfers the call received by the gateway device to the mobile terminal,
The private branch exchange is
It has multiple private branch exchange side line interfaces for connecting telephone lines,
The connection destination of the telephone line is a telephone or the gateway device,
An extension telephone number is assigned corresponding to the private branch exchange side line interface,
The gateway device is
A mobile terminal communication interface for connecting the mobile terminal;
An internet network communication interface for connecting the internet network;
A gateway device side line interface for connecting a telephone line connected to the private branch exchange side line interface;
Association between the identification information of the gateway device side line interface and the identification information of the portable terminal assigned to the extension telephone number assigned to the private branch exchange side line interface connected to the gateway device side line interface is registered. Management information,
The call transfer method is:
When the gateway device receives a call from a telephone whose gateway device side line interface is connected to the private branch exchange, the gateway device refers to the management information and corresponds to the identification information of the gateway device side line interface that received the call Identifying identification information of the mobile terminal,
The gateway device forwards the received call to a portable terminal identified by the identification information of the identified portable terminal, whereby an extension telephone number is set between the telephone connected to the private branch exchange and the portable terminal. A call transfer method characterized by enabling connection.

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