JP6683285B1 - Extension telephone system, main device, program, and extension telephone system calling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for shortening a transmission processing time of a mobile terminal in an extension telephone system for providing an extension telephone service to a mobile terminal via a mobile telephone network. In an extension telephone system, a main device (1) and a mobile terminal (3) are connected by an IP network (5) in addition to a mobile telephone network (4). When the mobile terminal 3 receives a calling operation accompanied by designation of a partner number from the user, the mobile terminal 3 notifies the main device 1 of the partner number via the IP network 5, and the mobile phone network 4 receives the main device number as a destination. And send a connection request. When the main device 1 receives a connection request with the main device number as the destination from the mobile terminal 3, the main device 1 returns a connection response to establish a communication path with the mobile terminal 3 and to carry the mobile phone via the IP network 5. A connection request having the other party's number received from the terminal 3 as a destination is transmitted to a predetermined telephone network 6-1 to 6-n. Then, if a call path is established with the destination, this call path is connected to the call path established with the mobile terminal 3. [Selection diagram] Figure 1

Description

  The present invention relates to an extension telephone system in which a main device provides an extension telephone service to a mobile terminal via a mobile telephone network, and more particularly to a transmission processing technique of this extension telephone system.

  In recent years, an extension telephone system using a mobile terminal such as a smart phone is known (for example, Patent Document 1). In this type of extension telephone system, when a main device provides an extension telephone service to a mobile terminal via a mobile telephone network, generally, a calling process is performed according to the sequence shown in FIG.

  That is, when the mobile terminal 81 receives a call operation accompanied by the designation of the telephone number (party number) of the call partner from the user (S50), the mobile terminal 81 transmits the telephone number (main device number) of the main device 80 that provides the extension telephone service. The aforementioned connection request is transmitted to the mobile phone network 82 (S51). This connection request is received by the main device 80 via the mobile phone network 82.

  In response to this, the main device 80 transmits a connection response to the mobile terminal 81 via the mobile phone network 82 (S52). As a result, a communication path is established between the main device 80 and the mobile terminal 81 via the mobile phone network 82 (S53). Then, the main device 80 transmits a DT (Dial Tone) signal to the mobile terminal 81 via the established communication path (S54).

  When the portable terminal 81 receives the DT signal from the main device 80 via the call path, the PB (Push Button) signal representing the other party number received from the user by the calling operation (S50) is sequentially digitized on the call path. (S55).

  When the main device 80 receives the PB signal from the portable terminal 81 via the communication path, the main device 80 transmits to the predetermined telephone network 83 a connection request having the destination number specified by the PB signal as the destination (S56). A connection response is received from the telephone network 83 (S57). As a result, a call path is established between the main device 80 and the call partner via the telephone network 83 (S58), and the main device 80 connects the call path established with the mobile terminal 81 and the call partner. The mobile terminal 81 and the communication partner are relayed (telephone exchange) by connecting to the communication path established between and (S59).

JP, 2008-187224, A

  As described above, in the conventional extension telephone system that provides the extension telephone service to the mobile terminal via the mobile telephone network, a call path is established between the mobile terminal and the main device, and the mobile terminal is connected via this call path. From the mobile terminal to the main device by sequentially transmitting PB signals representing the other party's number one digit at a time to notify the main device of the other party's number. Therefore, there is a problem that it takes a long time from when the user of the mobile terminal makes a call operation to when the call partner is called.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the transmission processing time of a mobile terminal in an extension telephone system in which a main device provides an extension telephone service to the mobile terminal via a mobile telephone network. It is to provide a technology that can be shortened.

  In order to solve the above problems, in the present invention, the main device and the mobile terminal are connected not only by a mobile phone network but also by an IP (Internet Protocol) network. Then, when the mobile terminal accepts a calling operation accompanied by designation of the partner number from the user, the mobile terminal notifies the main device of the partner number via the IP network, and at the same time, issues a connection request with the main device number as a destination. Send to the net. On the other hand, when the main device receives a connection request with the main device number as the transmission destination from the mobile terminal, the main device returns a connection response to establish a communication path with the mobile terminal, and at the same time via the IP network. A connection request having the other party's number received from the mobile terminal as a destination is transmitted to a predetermined telephone network. Then, when a connection response is received from the callee and the call path is established with the callee, the call path is connected to the call path established with the portable terminal.

For example, the extension telephone system of the present invention is
An extension telephone system including a mobile terminal and a main device that accommodates the mobile terminal,
The mobile terminal is
A partner number notifying means for notifying the main device of the other party's number via an IP (Internet Protocol) network, when a call operation accompanied by the designation of the other party's number, which is the telephone number of the other party, is received from the user.
And a transmission means for transmitting a connection request having a main device number, which is the telephone number of the main device, as a transmission destination to the mobile telephone network when the transmission operation is accepted,
The main device is
Partner number receiving means for receiving the partner number from the mobile terminal via the IP network,
When the connection request is received from the mobile phone network, a connection response is transmitted to the mobile terminal that is the source of the connection request, and a call path is established with the mobile terminal via the mobile phone network. An incoming call processing means to be established,
When the connection request is received, a connection request having the other party's number received by the other party's number receiving means as a destination is transmitted to a predetermined telephone network to communicate with the other party via the telephone network. A call processing means for establishing a communication path to
Relay means for connecting the call path established with the mobile terminal and the call path established with the call partner to relay between the mobile terminal and the call partner. Have.

The main device of the present invention is
A main device that provides an extension telephone service to a mobile terminal,
Partner number receiving means for receiving a partner number, which is the phone number of the other party, from the mobile terminal via an IP (Internet Protocol) network,
When a connection request originating from the mobile terminal's telephone number is received from the mobile phone network, a connection response is transmitted to the mobile terminal, and a call path is established with the mobile terminal via the mobile phone network. An incoming call processing means for establishing
When the connection request is received, a connection request having the other party's number received by the other party's number receiving means as a destination is transmitted to a predetermined telephone network, and communication with the other party via the telephone network is performed. A call processing means for establishing a communication path to
Relay means for connecting the call path established with the mobile terminal and the call path established with the other party to relay between the mobile terminal and the other party. Have.

  In the present invention, since the mobile terminal notifies the main device of the other party's number via the IP network, a PB signal representing the other party's number is sent from the mobile terminal to the main device via the communication path established between the main device and the mobile terminal. There is no need to send the digits one by one in order. Therefore, as compared with the related art, it is possible to shorten the time from when the user of the mobile terminal makes a call operation to when the calling party is called. Therefore, according to the present invention, in the extension telephone system in which the main device provides the extension telephone service to the mobile terminal via the mobile telephone network, it is possible to shorten the transmission processing time of the mobile terminal.

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 a calling operation of the extension telephone system according to the embodiment of the present invention. FIG. 3 is a schematic configuration diagram of the main device 1. FIG. 4 is a diagram schematically showing an example of registered contents in the terminal information storage unit 13. FIG. 5 is a diagram schematically showing an example of registered contents in the special number information storage unit 14. FIG. 6 is a flowchart for explaining the calling process of the main device 1. FIG. 7 is a schematic configuration diagram of the mobile terminal 3. FIG. 8 is a flowchart for explaining the calling process of the mobile terminal 3. FIG. 9 is a sequence diagram for explaining a calling operation of the conventional extension telephone system in which the main device 80 provides the extension telephone service to the mobile terminal 81 via the mobile telephone network 82.

  An embodiment of the present invention will be described below with reference to the drawings.

  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 mobile terminal 3 such as a smart phone and a main device 1 for providing the extension terminal service to the mobile terminal 3. The mobile terminal 3 is connected to the mobile phone network 4 and the IP network 5 via the base station 2. The main device 1 is connected to a mobile telephone network 4, an IP network 5, and a plurality of telephone networks 6-1 to 6-n (hereinafter also simply referred to as telephone network 6) provided by different telecommunications carriers. There is.

  FIG. 2 is a sequence diagram for explaining a calling operation of the extension telephone system according to the present embodiment.

  First, when the mobile terminal 3 accepts a call operation accompanied by designation of a telephone number (party number) of a communication partner and a telephone network 6 to be used from the user (S10), the main device 1 receives HTTPS (HyperText) via the IP network 5. A Transfer Protocol over SSL / TLS) connection request is transmitted (S11).

  In response to this, the main device 1 transmits a connection response to the mobile terminal 3 which is the transmission source of the HTTPS connection request (S12). As a result, an HTTPS session is established between the main device 1 and the mobile terminal 3 via the IP network 5. Then, the mobile terminal 3 adds the special number assigned to the telephone network 6 specified by this calling operation to the partner number specified by the calling operation received from the user, and the HTTP number including this special number + the partner number. The POST request is transmitted to the main device 1 via the HTTPS session (S13).

  In response to this, the main device 1 transmits a response response to the portable terminal 3 which is the transmission source of the POST request. Next, the mobile terminal 3 transmits a connection request with the telephone number of the main device 1 (main device number) to the mobile phone network 4 (S14). This connection request is received by the main device 1 via the mobile phone network 4.

  In response to this, the main device 1 transmits a connection response to the mobile terminal 3 via the mobile phone network 4 (S15). As a result, a communication path is established between the main device 1 and the mobile terminal 3 via the mobile phone network 4 (S16). Then, the main device 1 connects to the telephone network 6 to which the special number included in the POST request received from the mobile terminal 3 is given from among the gateways 120 (see FIG. 3) provided for each telephone network 6. The gateway 120 is selected (S17).

  Next, the main device 1 uses the selected gateway 120 to assign the partner number included in the POST request to the telephone network 6 to which the special number included in the POST request received from the mobile terminal 3 is added. A connection request for the destination is transmitted (S18), and a connection response is received from this telephone network 6 (S19). As a result, a call path is established between the main device 1 and the call partner via the telephone network 6 (S20), and the main device 1 establishes the call path established with the mobile terminal 3 and the call partner. The mobile terminal 3 and the other party of the call are relayed (telephone exchange) by connecting to the call path established between and (S21).

  Next, the details of the main device 1 and the mobile terminal 3 that compose the extension telephone system according to the present embodiment will be described.

  First, the main device 1 will be described.

  FIG. 3 is a schematic configuration diagram of the main device 1.

  As shown, the main device 1 includes an IP network interface unit 10, a mobile phone network interface unit 11, a gateway group 12, a terminal information storage unit 13, a special number information storage unit 14, and a partner number reception unit 15. The gateway selection unit 16, the incoming call processing unit 17, the outgoing call processing unit 18, the relay unit 19, and the main control unit 20 are provided.

  The IP network interface unit 10 is an interface for connecting to the IP network 5, and the mobile phone network interface unit 11 is an interface for connecting to the mobile phone network 4.

  The gateway group 12 has a plurality of gateways 120-1 to 120-n (hereinafter also simply referred to as gateways 120) provided corresponding to the telephone networks 6-1 to 6-n, respectively. The gateway 120 is an interface for connecting to the corresponding telephone networks 6-1 to 6-n.

  The terminal information storage unit 13 stores information about the mobile terminal 3 housed in the main device 1.

  FIG. 4 is a diagram schematically showing an example of registered contents in the terminal information storage unit 13.

  As illustrated, the terminal information storage unit 13 stores a terminal information record 130 for each mobile terminal 3 accommodated in the main device 1. The terminal information record 130 is received from the mobile terminal 3 in a field 131 in which the telephone number of the mobile terminal 3 is registered, a field 132 in which user information including a user name is registered, a field 133 in which an IP address is registered. It has a field 134 for registering the special number and a field 135 for registering the partner number received from the mobile terminal 3.

  The special number information storage unit 14 stores information on special numbers assigned to the telephone networks 6-1 to 6-n.

  FIG. 5 is a diagram schematically showing an example of registered contents in the special number information storage unit 14.

  As shown in the figure, the special number information storage unit 14 stores a special number information record 140 for each special number. The special number information record 140 includes a field 141 in which a special number is registered, a field 142 in which information on the telephone network 6 to which this special number is assigned is registered, and a gateway 120 which connects to the telephone network 6 to which this special number is assigned. And a field 143 in which information is registered.

  The partner number receiving unit 15 receives the HTTPS connection request and the HTTP POST request including the partner number to which the special number is added from the mobile terminal 3 via the IP network interface unit 10.

  The gateway selection unit 16 refers to the special number information storage unit 14 and selects, from the gateway group 12, the gateway 120 corresponding to the special number added to the partner number received by the partner number reception unit 15 from the mobile terminal 3.

  The incoming call processing unit 17 sends a connection response to the mobile terminal 3 when a connection request originating from the telephone number of the mobile terminal 3 is received from the mobile phone network 4 via the mobile phone network interface unit 11. , Establishes a communication path with the mobile terminal 3 via the mobile phone network 4.

  When the connection request originating from the telephone number of the mobile terminal 3 is received from the mobile telephone network 4 via the mobile telephone network interface unit 11, the calling processing unit 18 receives the partner number receiving unit 15 from the mobile terminal 3. A connection request with the other party number as the destination is transmitted to the telephone network 6 corresponding to the special number received from the mobile terminal 3 by the other party number receiving unit 15 via the gateway 120 selected by the gateway selecting unit 16, A call path is established with the other party via the telephone network 6.

  The relay unit 19 connects the call path established with the mobile terminal 3 by the incoming call processing unit 17 and the call path established with the other party by the call processing unit 18, and connects the mobile terminal 3 and the mobile terminal 3. Relay (telephone exchange) between the other parties.

  Then, the main control unit 20 centrally controls the respective units 10 to 19 of the main device 1.

  FIG. 6 is a flowchart for explaining the calling process of the main device 1.

  This flow is started when the partner number receiving unit 15 receives an HTTPS connection request from the mobile terminal 3 via the IP network interface unit 10.

  First, the partner number receiving unit 15 transmits a connection response to the mobile terminal 3 via the IP network interface unit 10 to establish an HTTPS session with the mobile terminal 3 (S100). Then, the other party number receiving unit 15 waits for an HTTP POST request from the mobile terminal 3 to be sent via this HTTPS session (S101).

  Next, when the partner number receiving unit 15 receives the POST request from the mobile terminal 3 (YES in S 101), the special number and the partner number included in the POST request are included in the main control unit 20 together with the IP address of the mobile terminal 3. To notify.

  In response to this, the main control unit 20 searches the terminal information storage unit 13 for the terminal information record 130 in which the IP address of the mobile terminal 3 received from the partner number receiving unit 15 is registered in the field 133. Then, the special number and the partner number received from the partner number receiving unit 15 are respectively registered in the fields 134 and 135 of the retrieved terminal information record 130 (S102).

  Next, the incoming call processing unit 17 receives a connection request from the mobile phone network 4 via the mobile phone network interface unit 11 with the main device number as the destination and the mobile terminal 3 as the source (S103). YES), a connection response is transmitted to the mobile terminal 3 via the mobile phone network interface unit 11 and the mobile phone network 4, and a communication path is established between the main device 1 and the mobile terminal 3 (S104). Also, the main controller 20 is notified of the telephone number of the mobile terminal 3.

  In response to this, the main control unit 20 searches the terminal information storage unit 13 for the record 130 of the terminal information in which the telephone number of the mobile terminal 3 received from the incoming call processing unit 17 is registered in the field 131. Then, the special number and the partner number registered in the fields 134 and 135 of the retrieved terminal information record 130 are acquired. Then, the main control unit 20 notifies the gateway selecting unit 16 of the acquired special number, and instructs the gateway selecting unit 16 to select the gateway 120.

  Next, the gateway selecting unit 16 searches the special number information storage unit 14 for the special number information record 140 in which the special number received from the main control unit 20 is registered in the field 141. Then, the gateway 120 specified by the information registered in the field 143 of the searched special number information record 140 is selected from the gateway group 12 (S105).

  Next, the main control unit 20 notifies the transmission processing unit 18 of the acquired partner number and the telephone number of the mobile terminal 3 together with the gateway 120 selected by the gateway selection unit 16. In response to this, the transmission processing unit 18 sets the other party's number as the destination via the gateway 120 notified by the main control unit 20 to the telephone network 6 connected to this gateway 120, and the telephone of the mobile terminal 3 is called. A connection request originating from the number is transmitted (S106). Then, the outgoing call processing unit 18 receives a connection response from the callee who is the caller of the connection request via the gateway 120, and establishes a call path with the callee (S107). In addition, the other party's number is notified to the main control unit 20 together with information on the gateway 120 connected to the telephone network in which the communication path with the other party is established.

  Next, the main control unit 20 notifies the relay unit 19 of the telephone number of the mobile terminal 3 notified by the incoming call processing unit 17, and the information of the partner number and the gateway 120 notified by the transmission processing unit 18. In response to this, the relay unit 19 connects the call path established with the mobile terminal 3 via the mobile phone network interface unit 11 and the call partner via the gateway 120 notified by the call processing unit 18. The call path established between them is connected to relay (telephone exchange) between the mobile terminal 3 and the other party (S108).

  Next, the mobile terminal 3 will be described.

  FIG. 7 is a schematic configuration diagram of the mobile terminal 3.

  As illustrated, the mobile terminal 3 includes an IP network interface unit 30, a mobile phone network interface unit 31, a man-machine interface unit 32, a telephone function unit 33, a partner number notification unit 34, and a main control unit 35. , Are provided.

  The IP network interface unit 30 is an interface for connecting to the IP network 5, and the mobile phone network interface unit 31 is an interface for connecting to the mobile phone network 4.

  The man-machine interface unit 32 is an interface for presenting information to the user, receiving information input from the user, and making a phone call by the user. For example, an input device such as a touch pad and a liquid crystal display or the like are used. It has a display device and an audio input / output device such as a handset.

  The telephone function unit 33 carries out processing necessary to function as a telephone. Specifically, by transmitting / receiving a call control message to / from the mobile telephone network 4 according to a predetermined call control protocol, a call path is established with the other party of the call, or the established call path is released. Also, according to a predetermined transmission protocol, a voice call is carried out with the other party via the established call path.

  The partner number notifying unit 34 sends an HTTP POST request including a special number and a partner number specified by a call operation received from the user via the man-machine interface unit 32 to the main device 1 via the IP network interface unit 30. Send.

  Then, the main control unit 35 centrally controls each unit 30 to 34 of the mobile terminal 3.

  FIG. 8 is a flowchart for explaining the calling process of the mobile terminal 3.

  This flow is started when the man-machine interface unit 32 accepts a calling operation accompanied by designation of the partner number and the telephone network 6 to be used from the user.

  First, the main control unit 35 specifies the special number assigned to the telephone network 6 designated by the calling operation received from the user via the man-machine interface unit 32. Then, the main control unit 35 notifies the partner number designated by the call operation to the partner number notification unit 34 together with the special number. In response to this, the partner number notification unit 34 transmits an HTTPS connection request to the main device 1 via the IP network interface unit 30 (S200). When a connection response is received from the main device 1 via the IP network interface unit 30 and an HTTPS session is established with the main device 1 via the IP network 5 (S201), a special number is added to the partner number. Then, the HTTP POST request including the partner number to which the special number is added is transmitted to the main device 1 via the established HTTPS session (S202).

  Next, the main control unit 35 instructs the telephone function unit 33 to make a call to the main device 1. In response to this, the telephone function unit 33 transmits a connection request to the mobile telephone network 4 via the mobile telephone network interface unit 31 with the main device number as the destination (S203). Then, by receiving a connection response from the mobile phone network 4 via the mobile phone network interface unit 31, a communication path is established with the main device 1 (S204). After that, in the main device 1, the call path established between the main device 1 and the mobile terminal 3 and the call path established between the main device 1 and the call partner are connected and both call paths are relayed. Then, a call between the mobile terminal 3 and the call partner becomes possible (S205).

  The embodiment of the present invention has been described above.

  In the present embodiment, since the mobile terminal 3 notifies the main device 1 of the other party's number via the IP network 5, the main device 1 and the mobile terminal 3 are connected via the communication path established via the mobile telephone network 4. Therefore, it is not necessary to sequentially transmit the PB signal indicating the partner number from the mobile terminal 3 to the main device 1 digit by digit. Therefore, as compared with the related art, it is possible to shorten the time required from the user of the mobile terminal 3 performing the call operation to calling the call partner. Therefore, according to the present embodiment, in the extension telephone system in which main device 1 provides extension telephone service to mobile terminal 3 via mobile telephone network 4, it is possible to shorten the transmission processing time from mobile terminal 3. .

  Further, in the present embodiment, the mobile terminal 3 establishes an HTTPS session with the main device 1 and notifies the main device 1 of the other party's number via this HTTPS session. The main device 1 can be notified.

  Further, in the present embodiment, the mobile terminal 3 adds the special number given to the telephone network 6 designated together with the other party number by the calling operation to the other party number, and sends the other party number to which this special number is added to the IP network. The main device 1 is notified via 5. Then, the main device 1 selects the gateway 120 from the gateway group 12 based on the special number added to the partner number received from the mobile terminal 3, and sends the partner number to the telephone network 6 via the selected gateway 120. And send a connection request. Therefore, the mobile terminal 3 can use the extension telephone service provided by the main device 1 to make a call to a plurality of telephone networks 6 provided by different telecommunications carriers, for example.

  It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist thereof.

  For example, in the above-described embodiment, the functional configuration of the main device 1 shown in FIG. 3 may be realized by hardware by an integrated logic IC such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Alternatively, it may be realized as software by a computer such as a DSP (Digital Signal Processor). Alternatively, in a general-purpose computer such as a PC (Personal Computer) equipped with a CPU, a memory, an auxiliary storage device such as an HDD, and a communication interface such as a NIC (Network Interface Card) or a telephone line board, the CPU stores the predetermined program in the auxiliary storage device. It may be realized by loading it from the memory to the memory and executing it.

  Also, the functional configuration of the mobile terminal 3 shown in FIG. 7 may be realized by hardware by an integrated logic IC such as ASIC or FPGA as in the case of the main device 1, or may be software by a computer such as DSP. May be realized in. Alternatively, in a portable computer such as a smart phone having a CPU, a memory, an auxiliary storage device such as a flash memory, and a communication interface such as a wireless module, the CPU loads a predetermined program from the auxiliary storage device into the memory and executes the program. It may be realized by doing.

  Further, in the above-described embodiment, the portable terminal 3 notifies the main device 1 of the partner number by using the HTTP POST request, but the present invention is not limited to this. For example, the portable terminal 3 may notify the main device 1 of the partner number by using an HTTP GET request or according to a unique protocol.

  Further, in the above embodiment, one of the telephone networks 6-1 to 6-n may be the mobile telephone network 4. Also, the number of telephone networks 6 may be one. In this case, the number of gateways 120 included in the gateway group 12 may be one. Further, the special number added to the partner number notified from the mobile terminal 3 to the main device 1 can be omitted.

1: Main device 2: Base station 3: Mobile terminal 4: Mobile phone network 5: IP network 6, 6-1 to 6-n: Telephone network 10: IP network interface unit 11: Mobile telephone network interface unit 12: Gateway group 13: terminal information storage unit 14: special number information storage unit 15: partner number reception unit 16: gateway selection unit 17: incoming call processing unit 18: outgoing call processing unit 19: relay unit 20: main control unit 30: IP network interface unit 31: Mobile phone network interface unit 32: Man-machine interface unit 33: Telephone function unit 34: Partner number notification unit 35: Main control unit 120-1 to 120-n: Gateway

Claims (6)

An extension telephone system including a mobile terminal and a main device that accommodates the mobile terminal,
The mobile terminal is
A partner number notifying means for notifying the main device of the other party's number via an IP (Internet Protocol) network, when a call operation accompanied by the designation of the other party's number, which is the telephone number of the other party, is received from the user.
And a transmission means for transmitting a connection request having a main device number, which is the telephone number of the main device, as a transmission destination to the mobile telephone network when the transmission operation is accepted,
The main device is
Partner number receiving means for receiving the partner number from the mobile terminal via the IP network,
When the connection request is received from the mobile phone network, a connection response is transmitted to the mobile terminal which is the source of the connection request, and a call path is established with the mobile terminal via the mobile phone network. An incoming call processing means to be established,
When the connection request is received, a connection request having the other party's number received by the other party's number receiving means as a destination is transmitted to a predetermined telephone network, and communication with the other party via the telephone network is performed. A call processing means for establishing a communication path to
Relay means for connecting the call path established with the mobile terminal and the call path established with the other party to relay between the mobile terminal and the other party. An extension telephone system characterized by having. The extension telephone system according to claim 1, wherein
The other party number notifying means,
An extension telephone system which notifies the main device of the other party's number via an HTTPS (HyperText Transfer Protocol over SSL / TLS) session established with the main device. The extension telephone system according to claim 1 or 2, wherein
The other party number notifying means,
The special number given to the telephone network specified together with the other party number in the call operation is added to the other party number, and the other party number to which the special number is added is added to the main device via the IP network. Notify,
The main device is
A gateway provided corresponding to each of the plurality of telephone networks, for connecting to the corresponding telephone network,
When the connection request arrives, further comprising a gateway selection unit for selecting the gateway specified by the special number added to the other party number received by the other party number receiving unit,
The transmission processing means,
When the connection request arrives, a connection request having the destination number as a destination is transmitted to the telephone network corresponding to the gateway via the gateway selected by the gateway selection means. Extension telephone system. A main device that provides an extension telephone service to a mobile terminal,
Partner number receiving means for receiving a partner number, which is the phone number of the other party, from the mobile terminal via an IP (Internet Protocol) network,
When a connection request originating from the telephone number of the mobile terminal is received from the mobile phone network, a connection response is transmitted to the mobile terminal and a call path is established between the mobile terminal and the mobile terminal. An incoming call processing means for establishing
When the connection request is received, a connection request having the other party's number received by the other party's number receiving means as a destination is transmitted to a predetermined telephone network, and communication with the other party via the telephone network is performed. A call processing means for establishing a communication path to
Relay means for connecting the call path established with the mobile terminal and the call path established with the other party to relay between the mobile terminal and the other party. Main device characterized by having. A computer executable program,
The program is
Causing the computer to function as a main device for providing an extension telephone service to a mobile terminal,
The main device is
A partner number receiving means for receiving a partner number, which is a partner's telephone number, from the portable terminal via an IP (Internet Protocol) network,
When a connection request originating from the telephone number of the mobile terminal is received from the mobile phone network, a connection response is transmitted to the mobile terminal and a call path is established between the mobile terminal and the mobile terminal. An incoming call processing means for establishing
When the connection request is received, a connection request having the other party's number received by the other party's number receiving means as a destination is transmitted to a predetermined telephone network, and communication with the other party via the telephone network is performed. A call processing means for establishing a communication path to
Relay means for connecting the call path established with the mobile terminal and the call path established with the other party to relay between the mobile terminal and the other party. A program characterized by having. A method of transmitting an extension telephone system, comprising: a mobile terminal; and a main device that houses the mobile terminal,
The mobile terminal is
When the user receives a call operation accompanied by the designation of a partner number, which is the telephone number of the other party, the main device is notified of the partner number via an IP (Internet Protocol) network, and the telephone of the main device is called. Send a connection request to the mobile phone network with the main device number, which is a number, as the destination,
The main device is
Receiving the partner number from the mobile terminal via the IP network,
When the connection request is received from the mobile phone network, a connection response is transmitted to the mobile terminal which is the source of the connection request, and a call path is established with the mobile terminal via the mobile phone network. Along with the establishment, by transmitting a connection request to the other party number received from the mobile terminal as a destination to a predetermined telephone network, to establish a communication path with the other party through the telephone network,
The call path established with the mobile terminal and the call path established with the call partner are connected to relay between the mobile terminal and the call partner. External dialing method for internal telephone system.

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