JP2007097051A - Telephone control apparatus and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform incoming call transfer control regarding an extension mobile phone terminal without requiring any setting operation and cancel operation of call forwarding setting by a user. <P>SOLUTION: A telephone control apparatus 1 manages terminal registration of a mobile phone terminal 2 in response to periodical terminal registration from the relevant mobile phone terminal 2. In the case of call incoming to the mobile phone terminal 2, when the relevant mobile phone terminal 2 is registered, incoming call is notified to the relevant mobile phone terminal 2 via an extension radio channel 3A and when the relevant mobile phone terminal 2 is not registered, on the basis of a preset forwarding destination telephone number of the relevant mobile phone terminal 2, a relevant incoming call is forwarded to the mobile phone terminal 2 via a communication line 4A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an incoming call transfer technique, and more particularly, to an incoming call transfer technique for transferring an incoming call to an unregistered mobile phone terminal to an intended transfer destination.

  In recent years, with the development of wireless data communication technology, a so-called wireless LAN dual mobile phone that has a function of connecting to a wireless LAN as well as a mobile phone network that is normally connected as a mobile phone terminal and can be used as a wireless LAN phone. A telephone terminal has been proposed (see, for example, Non-Patent Document 1). When this type of wireless LAN dual mobile phone terminal is located in a wireless LAN communication area provided by an in-house telephone system, for example, it is an extension mobile phone registered in the telephone system and accommodated in the telephone system. When operating as a terminal and moving out of the wireless LAN communication area due to going out, etc., the terminal is registered in the mobile phone network and operates as a general mobile phone terminal. Thereby, the user can use the same mobile phone terminal in common regardless of inside or outside the company.

  Therefore, if a gateway for wireless LAN is connected to the above-described telephone system having a call forwarding function, the wireless LAN dual portable telephone terminal can be operated as an extension portable telephone terminal of the telephone system. Furthermore, if the outside line telephone number of the wireless LAN dual mobile phone terminal is registered in the telephone control device as the transfer destination telephone number, when the user of the wireless LAN dual mobile phone terminal goes out, If there is an incoming call to the extension mobile phone terminal after going out, the incoming call is forwarded to the external phone number of the wireless LAN dual mobile phone terminal registered in advance as the absence transfer destination, and the incoming call to the extension mobile phone terminal in the office It is possible to make a call with the caller by answering on the go with the wireless LAN dual mobile phone terminal.

JP-A-7-95298 http://www.docomo.biz/html/product/cordless/n900il/index.html, NTT DoCoMo, Inc.

However, in such a conventional technique, when an incoming call to an extension mobile phone terminal is detected, the telephone control device of the telephone system determines whether or not a missed transfer is necessary according to whether or not the absence transfer is set for the extension mobile phone terminal. Therefore, it is necessary to set and cancel the absentee transfer setting according to the user going out and returning to work, which is a very useful function, but it is not used effectively due to the troublesomeness of the operation. There was a problem that proper incoming call processing could not be performed because call forwarding was not set properly.
The present invention is intended to solve such a problem, and a telephone control device capable of performing incoming call transfer control for an extension mobile phone terminal without requiring a user to perform setting and canceling of call forwarding settings. And aims to provide a program.

  In order to achieve such an object, the telephone control device according to the present invention connects a telephone line from the telephone network and accommodates a plurality of mobile telephone terminals connectable to the mobile telephone network via an extension wireless line. A telephone control device for exchanging and connecting a telephone line and a mobile phone terminal, including terminal registration management information indicating whether or not the mobile phone terminal is registered, and a transfer destination telephone number when the mobile phone terminal is not registered. A storage unit for storing transfer destination information, a registration management unit for updating terminal registration management information according to whether communication with a mobile phone terminal via an extension wireless line is possible, and a terminal according to an incoming call to the mobile phone terminal Refer to the registration management information. If there is terminal registration for the mobile phone terminal, the mobile phone terminal is notified of the incoming call via the extension wireless line. If there is no terminal registration for the mobile phone terminal, it is obtained from the forwarding destination information. did And a call control means for transferring the call to the transfer destination telephone number of the portable telephone terminal.

  At this time, the registration management means may update the terminal registration management information in accordance with the presence / absence of regular terminal registration from the mobile phone terminal via the extension wireless line.

  The program according to the present invention connects a telephone line from a telephone network, accommodates a plurality of mobile phone terminals connectable to the mobile telephone network via an extension wireless line, and connects the telephone line and the mobile telephone terminal. The storage unit stores terminal registration management information indicating whether or not the mobile phone terminal is registered, and transfer destination information indicating a transfer destination telephone number when the mobile phone terminal is not registered in the computer of the telephone control device to be exchanged and connected. A registration management step of updating the terminal registration management information according to whether communication with the mobile phone terminal via the extension wireless line is possible, and referring to the terminal registration management information according to an incoming call to the mobile phone terminal, If there is terminal registration for the mobile phone terminal, an incoming call notification is sent to the mobile phone terminal via the extension wireless line. If there is no terminal registration for the mobile phone terminal, the mobile phone terminal obtained from the transfer destination information is sent. To perform the call control step of transferring the call to the transfer destination telephone number of the telephone terminal.

  At this time, in the registration management step, the terminal registration management information may be updated according to the presence or absence of regular terminal registration from the mobile phone terminal via the extension wireless line.

  According to the present invention, the telephone control device manages the presence / absence of terminal registration of the mobile phone terminal according to whether communication with the mobile phone terminal via the extension wireless line is possible or not. If there is a terminal registration for the phone terminal, an incoming call notification is sent to the mobile phone terminal via the extension wireless line, and if there is no terminal registration for the mobile phone terminal, a preset transfer destination of the mobile phone terminal Since the incoming call is transferred to the telephone number, whether or not transfer is necessary is automatically determined according to the presence or absence of terminal registration from the mobile phone terminal.

  Therefore, for example, it avoids improper incoming call processing such as not being forwarded when the user forgets to set up missed transfer when going out, or not notified when the user forgets to cancel the missed call setting when returning to work. In addition, it is possible to perform appropriate incoming call transfer control for the extension mobile phone terminal without requiring setting operation and cancellation operation of the absentee transfer setting by the user.

Next, embodiments of the present invention will be described with reference to the drawings.
[Telephone control device]
First, a telephone control device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a telephone control device according to an embodiment of the present invention and a telephone system in which the telephone control device is used.

  The telephone control device 1 is a communication control device corresponding to, for example, a main device of a button telephone device. The telephone control device 1 is connected to a telephone line 4A from the telephone network 4 and is portable via a gateway (GW) 3 such as a wireless LAN base station. The telephone system 10 is constructed by accommodating the telephone terminals 2 (2A, 2B). The telephone network 4 is a general telephone network such as a public switched telephone network (PSTN), an integrated services digital network (ISDN), an IP telephone network, or a CATV (Community Antenna TeleVision) telephone network.

  The mobile phone terminal 2 has a function of connecting to the mobile phone network 5 through the wireless line 5A and a function of connecting to the telephone control device 1 through the extension wireless line 3A, and is only as a general mobile phone terminal. In addition, the wireless LAN dual mobile phone terminal can also be used as an extension mobile phone terminal of the telephone system 10. Note that the mobile phone terminal 2 is configured by a known mobile terminal technology, and a detailed description thereof is omitted here.

  In the present embodiment, the presence / absence of terminal registration of the mobile phone terminal 2 is managed in accordance with regular terminal registration from the mobile phone terminal 2, and the terminal of the mobile phone terminal 2 is received when receiving an incoming call to the mobile phone terminal 2. If there is a registration, the mobile phone terminal 2 is notified of an incoming call via the extension wireless line 3A. If there is no terminal registration of the mobile phone terminal 2, a preset transfer destination telephone of the mobile phone terminal 2 The incoming call is forwarded to the number.

Next, the telephone control device according to the first embodiment of the present invention will be described in detail with reference to FIG.
The telephone control device 1 includes an information processing device having a communication function, and includes a line interface unit (hereinafter referred to as a line I / F unit) 11, a communication interface unit (hereinafter referred to as a communication I / F unit) 12, and a switch (SW ) 13, a storage unit 14, and a control unit 15 are provided.

The line I / F unit 11 includes a dedicated communication circuit unit, and has a function of controlling termination by connecting to the telephone line 4A from the telephone network 4.
The communication I / F unit 12 includes a dedicated communication circuit unit and has a function of performing data communication with one or more gateways 3.
The switch 13 includes a dedicated switching circuit unit, and has a function of exchanging and connecting transmission lines (speech paths) between the line I / F unit 11 and the communication I / F unit 12.

  The storage unit 14 includes a storage device such as a hard disk or a memory, and has a function of storing processing information used for various processes in the control unit 15 and a program 14P. The program 14 </ b> P is a program that realizes various functional means used for telephone control by being read and executed by the control unit 15, and is previously fetched from an external device or a recording medium and stored in the storage unit 14.

Main processing information stored in the storage unit 14 includes registration management information 14A and transfer destination information 14B.
FIG. 2 is a configuration example of registration management information. Here, the extension mobile phone terminal number assigned in advance for controlling the mobile phone terminal 2 as the extension mobile phone terminal of the telephone system 10 and the presence / absence of terminal registration from the mobile phone terminal 2 to the telephone control device 1 are shown. Terminal registration presence / absence information is registered as a set. The terminal registration presence / absence information of the registration management information 14 </ b> A is updated by the control unit 15 according to the presence / absence of terminal registration periodically performed from each mobile phone terminal 2.

  FIG. 3 is a configuration example of transfer destination information. Here, the extension mobile phone terminal number of each mobile phone terminal 2 and the transfer destination phone number when the mobile phone terminal 2 is not registered in the telephone control device 1 are registered as a set. The transfer destination telephone number of the transfer destination information 14B is a mobile phone number used when the mobile phone terminal 2 is connected to the mobile phone network 5, and is registered in advance by the user from each mobile phone terminal 2, for example.

The control unit 15 includes a microprocessor such as a CPU and peripheral circuits thereof, and is a functional unit that implements various functional units used for telephone control by reading and executing the program 14P from the storage unit 14.
As main functional means realized by the control unit 15, there are a call control means 15A and a registration management means 15B.

  The call control unit 15A is a unit that performs call control of the entire telephone system 10, and controls the line I / F unit 11 and the switch 13 on the basis of call control information (not shown) in the storage unit 14 as well as communication I / F. By exchanging various control information with each wireless telephone terminal 2 via the F unit 12 and the gateway 3, an external line outgoing / incoming operation by the wireless telephone terminal 2 using the telephone line 4A and an internal outgoing / incoming operation between the wireless telephone terminals 2 It has a function to control.

  Further, the call control means 15A has a function of confirming whether or not the wireless telephone terminal 2 is registered by referring to the registration management information 14A of the storage unit 14 when an incoming call is made to an arbitrary wireless telephone terminal 2, and the wireless telephone when the incoming call is received. When the terminal 2 is registered as a terminal, the function that notifies the mobile phone terminal 2A of the incoming call from the communication I / F unit 12 via the extension wireless line 3A and the wireless telephone terminal 2 is registered as a terminal when the incoming call is received If not, the mobile phone terminal 2 has a function of transferring the incoming call to the mobile phone terminal via the call line 4A based on the transfer destination phone number of the mobile phone terminal 2 acquired from the transfer destination information 14B of the storage unit 14.

  The registration management means 15B accepts a periodic terminal registration request from the mobile phone terminal 2 via the gateway 3 and the communication I / F unit 12, and registers that the mobile phone terminal 2 is registered as registration management information in the storage unit 14. A function for recording in 14A, and a function for recording no registration of the mobile phone terminal 2 in the registration management information 14A of the storage unit 14 when a terminal registration request from the mobile phone terminal 2 is not accepted for a predetermined period or longer. is doing. For terminal registration by the mobile phone terminal 2, for example, when a wireless LAN communication system is used, terminal registration is performed based on a known call control protocol such as SIP (Session Initiation Protocol).

[Operation of telephone control device]
Next, the operation of the telephone control device according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an incoming operation of the telephone control device according to the present embodiment.

  The control unit 15 of the telephone control device 1 detects an incoming call from the telephone network (outside line incoming call) by the line I / F unit 11 or calls an extension from the mobile phone terminal 2 via the communication I / F unit 12 ( 4 is started when an extension call is received.

First, the control unit 15 uses the call control unit 15A to obtain a called number indicating the destination from the call control information notified at the time of the incoming call (step 100). Subsequently, the call control means 15A refers to the registration management information 14A in the storage unit 14 (step 101), and confirms whether the mobile phone terminal 2 having the mobile terminal number that matches the called number is registered (step 102). ).
If the mobile phone terminal 2 having the mobile terminal number that matches the called number is not registered (step 102: YES), the call control means 15A confirms whether the mobile phone terminal 2 is registered (step 103). .

When the mobile phone terminal 2 having the mobile terminal number that matches the called number is registered (step 103: YES), since the mobile phone terminal 2 that is the destination is connected in the telephone system 10, The call control means 15A notifies the incoming call from the communication I / F unit 12 to the mobile phone terminal 2 of the called number via the gateway 3 and the extension wireless line 3A (step 104), and ends a series of incoming calls.
As a result, the mobile phone terminal 2 that has received the incoming call notification displays the incoming call, and then returns a response notification to the telephone control device 1 in response to a response operation by the user, via the switch 13 of the telephone control device 1. A transmission path (speech path) between the called party and the mobile phone terminal 2 is connected and a call is started.

  On the other hand, when the mobile phone terminal 2 having the mobile terminal number that matches the called number is not registered in step 103 (step 103: NO), the mobile phone terminal 2 that is the destination is connected to the telephone system 10 Therefore, the call control unit 15A refers to the transfer destination information 14B in the storage unit 14 (step 105) and confirms whether the transfer destination telephone number of the destination mobile phone terminal 2 is registered (step 106). ).

Here, when the transfer destination telephone number of the destination mobile phone terminal 2 is registered in the transfer destination information 14B (step 106: YES), the call control means 15A uses the line I / O based on the transfer destination telephone number. The incoming call is transferred from the F unit 11 to the mobile phone terminal 2 via the telephone line 4A (step 107).
As a result, the mobile phone terminal 2 that has received the incoming call notification via the telephone network 4, the mobile phone network 5, and the wireless line 5 A displays the incoming call and then responds to the telephone according to the response operation by the user. Returned to the device 1, the transmission path (call path) between the call destination and the mobile phone terminal 2 is connected via the switch 13 of the telephone control apparatus 1, and the call is started.

  When the mobile phone terminal 2 having the mobile terminal number that matches the called number is not registered in step 102 (step 102: NO), and in step 106, the transfer destination telephone number of the destination mobile phone terminal 2 is If it is not registered in the forwarding destination information 14B (step 106: NO), the call control means 15A ignores the incoming call and does not perform incoming processing (step 108), and ends a series of incoming processing.

[Telephone control device operation example]
Next, an operation example of the telephone control device according to the present embodiment will be described with reference to FIGS. FIG. 5 is a sequence diagram showing an example of an incoming call operation (at the time of terminal registration) of the telephone control device according to the present embodiment. FIG. 6 is a sequence diagram showing an example of an incoming call operation of the telephone control device according to the present embodiment (when not registered).

  First, referring to FIG. 5, as an example of an incoming call operation (at the time of terminal registration) of the telephone control device according to the present embodiment, a case where an extension call is made from mobile phone terminal 2A to mobile phone terminal 2B is taken as an example. explain. Here, it is assumed that the mobile phone terminals 2 </ b> A and 2 </ b> B are within the wireless communication area of the telephone system 10.

  The mobile phone terminals 2A and 2B are located in the wireless communication area of the telephone system 10, and periodically make terminal registration requests to the telephone control device 1 (steps 200 and 202). The control unit 15 of the telephone control apparatus 1 accepts a periodic terminal registration request from the mobile phone terminals 2A and 2B via the extension wireless line 3A, the gateway 3 and the communication I / F unit 12 by the registration management unit 15B. The presence of terminal registration of the mobile phone terminals 2A and 2B is recorded in the registration management information 14A of the storage unit 14 (steps 201 and 203).

In such a state, when a call request is sent from the mobile phone terminal 2A to the mobile phone terminal 2B, the control unit 15 of the telephone control device 1 uses the call control means 15A to receive the incoming call shown in FIG. Execute the process. In this example, since the destination mobile phone terminal 2B is registered as a terminal in the telephone control device 1 (step 211: YES), the called number is transmitted from the communication I / F unit 12 via the gateway 3 and the extension wireless line 3A. The mobile phone terminal 2 is notified of the incoming call (step 212).
As a result, the mobile phone terminal 2 that has received the incoming call notification displays the incoming call, and then returns a response notice to the telephone control device 1 in response to a response operation by the user (step 213). Then, the transmission path (speech path) between the called party and the mobile phone terminal 2 is connected and the call is started (step 214).

  Next, referring to FIG. 6, as an example of an incoming call operation of the telephone control device according to the present embodiment (when not registered), a case where an extension call is made from the mobile phone terminal 2A to the mobile phone terminal 2B is shown. Explained as an example. Here, the mobile phone terminal 2A is located in the wireless communication area of the telephone system 10, and the mobile phone terminal 2B moves out of the wireless communication area of the telephone system 10 to move to the wireless communication area of the mobile phone network 5. It shall be in the area.

  The mobile phone terminal 2A is located in the wireless communication area of the telephone system 10, and periodically makes a terminal registration request to the telephone control device 1 (step 220). The control unit 15 of the telephone control device 1 receives a periodic terminal registration request from the mobile phone terminal 2A via the extension wireless line 3A, the gateway 3 and the communication I / F unit 12 by the registration management unit 15B, and The presence of terminal registration of the telephone terminal 2A is recorded in the registration management information 14A of the storage unit 14 (step 221).

On the other hand, the mobile phone terminal 2B is located outside the radio communication area of the telephone system 10 and within the radio communication area of the mobile phone network 5, and periodically makes a terminal registration request to the mobile phone network 5. (Step 222). The cellular phone network 5 receives a periodic terminal registration request from the cellular phone terminal 2B via the wireless line 5A, and grasps that the cellular phone terminal 2B is connected to the cellular phone network 5 (step 223). .
Further, the control unit 15 of the telephone control device 1 does not accept a terminal registration request from the mobile phone terminal 2B for a predetermined period or longer by the registration management unit 15B, and therefore indicates that the mobile phone terminal 2B is not registered in the storage unit 14. It records in the registration management information 14A (step 224).

  In such a state, when a call request is sent from the mobile phone terminal 2A to the mobile phone terminal 2B, the control unit 15 of the telephone control device 1 uses the call control means 15A to receive the incoming call shown in FIG. Execute the process. In this example, since the destination mobile phone terminal 2B is not registered in the telephone control device 1 (step 231: YES), the transfer destination telephone number of the mobile phone terminal 2B is acquired from the transfer destination information 14B (step 232). The incoming call notification is transmitted from the line I / F unit 11 to the mobile phone terminal 2 via the call line 4A based on the transfer destination telephone number, and the incoming call is transferred (step 233).

  As a result, in the mobile phone terminal 2B that has received the incoming call notification via the telephone network 4, the mobile phone network 5, and the wireless line 5A, the incoming call is displayed, and then the response notification is telephone controlled according to the response operation by the user. It is returned to the device 1 (step 234). In response to this response notification, the call control means 15A of the telephone control device 1 controls the switch 13 to connect the transmission path (call path) between the caller mobile phone terminal 2A and the callee mobile phone terminal 2B. Then, the incoming call to the destination mobile phone terminal 2B is transferred and a call is started between them (step 235).

  As described above, according to the present embodiment, the presence / absence of terminal registration of the mobile phone terminal 2 is managed according to whether communication with the mobile phone terminal 2 via the extension wireless line 3A is possible. If there is terminal registration of the mobile phone terminal 2, an incoming notification is sent to the mobile phone terminal 2 via the extension wireless line 3A. If there is no terminal registration of the mobile phone terminal 2, the preset Since the incoming call is transferred to the transfer destination telephone number of the mobile phone terminal 2, whether or not transfer is necessary is automatically determined according to the presence or absence of terminal registration from the mobile phone terminal 2.

  Therefore, for example, it avoids improper incoming call processing such as not being forwarded when the user forgets to set up missed transfer when going out, or not notified when the user forgets to cancel the missed call setting when returning to work. In addition, it is possible to perform appropriate incoming call transfer control to the mobile phone terminal 2 without requiring the user to perform setting operation and cancellation operation of the absent call transfer setting.

  In addition, when managing the terminal registration presence / absence of the mobile phone terminal 2, the terminal registration management information is updated according to the presence / absence of regular terminal registration from the mobile phone terminal via the extension wireless line. Whether or not the mobile phone terminal 2 is registered can be managed without changing the call control protocol for the terminal.

  In the above embodiment, whether or not communication with the mobile phone terminal 2 via the extension wireless line 3A is possible is not limited to the method of determining by terminal registration from the mobile phone terminal 2. For example, whether or not communication with the mobile phone terminal 2 may be checked by exchanging data with the mobile phone terminal 2 from the telephone control device 1, or other than terminal registration transmitted intermittently from the mobile phone terminal 2 Data may be detected to check whether communication with the mobile phone terminal 2 is possible.

  Further, the transfer destination telephone number registered as the transfer destination information 14B of the telephone control device 1 is not limited to the mobile phone number of the mobile phone terminal 2, and for example, an automatic response is made to an incoming call when there is no call. It may be a telephone number of an answering machine that sends a predetermined voice message and records the message of the caller as necessary, or may be a telephone number indicating another extension telephone in the telephone system 10.

1 is a block diagram showing a configuration of a telephone control device according to an embodiment of the present invention and a telephone system in which the telephone control device is used. It is a structural example of registration management information. It is a structural example of transfer destination information. It is a flowchart which shows the incoming call operation | movement of the telephone control apparatus concerning this Embodiment. It is a sequence diagram which shows the incoming call operation example (at the time of terminal registration) of the telephone control apparatus concerning this Embodiment. It is a sequence diagram which shows the incoming call operation example (at the time of non-terminal registration) of the telephone control apparatus concerning this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Telephone control apparatus, 11 ... Line | wire I / F part, 12 ... Communication I / F part, 13 ... Switch (SW), 14 ... Memory | storage part, 14A ... Registration management information, 14B ... Transfer destination information, 15 ... Control part , 15A ... call control means, 15B ... registration management means, 2, 2A, 2B ... mobile phone terminal, 3 ... gateway (GW), 3A ... extension wireless line, 4 ... telephone network, 4A ... call line, 5 ... mobile phone Network, 5A ... wireless line, 10 ... telephone system.

Claims (4)

A telephone control device for connecting a telephone line from a telephone network, accommodating a plurality of mobile telephone terminals connectable to a mobile telephone network via an extension wireless line, and exchanging and connecting the telephone line and the mobile telephone terminal There,
A storage unit for storing terminal registration management information indicating whether or not the mobile phone terminal is registered, and transfer destination information indicating a transfer destination telephone number when the mobile phone terminal is not registered;
Registration management means for updating the terminal registration management information according to whether communication with the mobile phone terminal via the extension wireless line is possible;
The terminal registration management information is referred to in response to an incoming call to the mobile phone terminal, and if there is terminal registration of the mobile phone terminal, the mobile phone terminal is notified of the incoming call via the extension wireless line, and the mobile phone A telephone control device comprising: call control means for transferring the incoming call to a transfer destination telephone number of the mobile phone terminal acquired from the transfer destination information when there is no terminal registration of the terminal. The telephone control device according to claim 1, wherein
The telephone control apparatus, wherein the registration management means updates the terminal registration management information according to the presence / absence of regular terminal registration from the mobile phone terminal via the extension wireless line. A telephone control apparatus for connecting a telephone line from a telephone network, accommodating a plurality of mobile telephone terminals connectable to a mobile telephone network via an extension wireless line, and exchanging and connecting the telephone line and the mobile telephone terminal On the computer,
Storing in a storage unit terminal registration management information indicating whether or not the mobile phone terminal is registered and transfer destination information indicating a transfer destination telephone number when the mobile phone terminal is not registered;
A registration management step of updating the terminal registration management information according to whether communication with the mobile phone terminal via the extension wireless line is possible;
The terminal registration management information is referred to in response to an incoming call to the mobile phone terminal, and if there is terminal registration of the mobile phone terminal, the mobile phone terminal is notified of the incoming call via the extension wireless line, and the mobile phone A program that executes a call control step of transferring the incoming call to the transfer destination telephone number of the mobile phone terminal acquired from the transfer destination information when the terminal is not registered. In the program according to claim 3,
The registration management step updates the terminal registration management information in accordance with the presence or absence of regular terminal registration from the mobile phone terminal via the extension wireless line.

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