JP2007201771A - Telephone switching system accommodating mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telephone switching system which allows even a mobile terminal to easily make a call, wherein the mobile terminal is scheduled to move between bases where a telephone switch is arranged respectively. <P>SOLUTION: The telephone switching system comprises a plurality of telephone switches interconnected through a network and a plurality of mobile terminals. Each of the mobile terminals can be accommodated one of the telephone switches. According to the current position of one of the mobile terminals, one of the telephone switches serves as an accommodation destination telephone switch, accommodates the one of the mobile terminals, and registers association between a terminal ID of the one of the mobile terminals and a base information on the accommodation destination telephone switch, whenever the mobile terminal is accommodated. Then, in response to a call originating request for a call which employs the terminal ID of the one of the mobile terminals as a call destination ID, a base information associated with the call destination ID is distinguished from the association, and the call is terminated at a mobile terminal associated with the call destination ID through an accommodation destination telephone switch associated with the distinguished base information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a telephone exchange system including a plurality of telephone exchanges provided at each of a plurality of bases such as a company office, and more particularly to a telephone switching system that accommodates telephone terminals that are scheduled to move between the bases. .

  In recent years, cases of constructing a large-scale communication infrastructure spanning a plurality of bases in companies are increasing. In these cases, a private branch exchange, that is, a PBX is arranged at each base, and a single telephone exchange system is constructed by connecting each PBX with a line such as a dedicated line. In such a telephone exchange system, each telephone terminal is first accommodated in a PBX at each base, and a local number is assigned to each terminal. The user of the telephone terminal can make an extension call between the telephone terminals by designating the other party with such a local number (see FIG. 1).

  By the way, with the spread of VoIP (Voice over IP) and IP (Internet Protocol) network technologies, each PBX is used as an IP exchange, and the telephone terminals accommodated therein are not only conventional telephones but also IP telephones using the IP protocol. Cases are also coming out.

A telephone exchange system disclosed in Patent Document 1 includes an IP telephone server, holds a host name of the conventional telephone in association with an IP address of a main apparatus, and stores the telephone number of the conventional telephone in the conventional telephone. Means for storing the information in association with the host name of the telephone, and the conventional telephone and the IP telephone can make an extension call with each other.
JP 2004-228997 A

  However, such a telephone exchange system can accommodate IP telephones and conventional telephones that are fixedly installed at one site, but considers mobile phone terminals that are scheduled to move between sites. It has not been.

  An object of the present invention is to provide a telephone exchange system that can easily make a call even by a mobile terminal that is scheduled to move between bases each provided with a telephone exchange.

A telephone exchange system according to the present invention is a telephone exchange system including a plurality of telephone exchanges interconnected via a network and a plurality of mobile terminals each capable of being accommodated in any one of the telephone exchanges. In accordance with the current location of one of the terminals, any one of the telephone exchanges is used as an accommodation destination telephone exchange, and accommodation means for accommodating the one mobile terminal therein
Each time the one mobile terminal is accommodated, a registration means for registering a correspondence relationship between the terminal ID of the one mobile terminal and the base information of the accommodation destination telephone exchange, and any one of the terminal IDs is designated as a destination ID. In response to a call origination request, a determination means for determining the base information corresponding to the destination ID from the correspondence, and the destination ID via the accommodation telephone switch corresponding to the determined base information And an incoming means for making the mobile terminal to receive the call.

  According to the telephone exchange system of the present invention, a mobile terminal that can be a conventional telephone or an IP telephone terminal is identified by its terminal ID, and a configuration for discriminating a telephone exchange that accommodates it according to its current position is provided. It is done. Thus, a call can be easily made by a mobile terminal that is scheduled to move between bases each provided with a telephone exchange.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<First embodiment>
FIG. 2 shows the configuration of the IP telephone exchange system in the first embodiment of the present invention. Here, the IP telephone exchanges 201, 202, and 203 are exchanges arranged at each base, and accommodate IP terminals including IP telephones and softphones, and conventional telephone terminals represented by analog telephones and PHS. It is an exchange that can. The IP telephone exchanges 201, 202, and 203 are connected via an IP network 206 and can communicate with each other.

  The terminal 204 is a fixed telephone terminal accommodated in the IP telephone exchange 202, and is a terminal used in a stationary state such as an IP fixed telephone or an analog telephone. The terminal 205 is a mobile telephone terminal that can move between bases such as an IP terminal equipped with a PHS or a soft phone. The terminal 205 operates by being accommodated in either the IP telephone exchange 202 or the IP telephone exchange 203 as it moves between the bases. The fixed terminal 204 and the mobile terminal 205 are connected to the IP telephone exchange 202 or 203 via a communication relay device (not shown) such as a wired or wireless switch, router, or wireless base station. Each of the fixed terminal 204 and the mobile terminal 205 is used with an ID number set for each terminal.

  Here, the ID number is a terminal ID, which is a number that can be set uniquely and arbitrarily in the IP telephone exchange system. That is, the ID number is a number that can be freely set unlike the terminal specific information that each terminal has uniquely in the manufacturing stage. Therefore, as the ID number, for example, a number such as an employee number assigned to an individual within a company is used instead of an extension number set for each IP telephone exchange. Referring to FIG. 2, the terminal 204 is set with an ID number “111”, and the terminal 205 is set with an ID number “222”.

  The IP telephone exchange 201 is an exchange having a normal telephone exchange function and a function of performing management of which base IP telephone exchange accommodates each terminal corresponding to each ID number, that is, ID position management. . In order to perform such management, the IP telephone exchange 201 internally has an ID position information table 211 that provides a correspondence relationship between ID numbers and base information for identifying each base. As the base information, any information can be used as long as the information can uniquely identify the base such as the identification information of the IP telephone exchange 202 or the IP address. In the description of this embodiment, the base information of the IP telephone exchange 202 is “A”, and the base information of the IP telephone exchange 203 is “B”.

  The IP telephone exchanges 202 and 203 are exchanges that have a normal telephone exchange function and manage a fixed terminal or a mobile terminal accommodated in each of the bases A and B. Each of the IP telephone exchanges 202 and 203 provides a correspondence between the above-described ID number, a local number that is unique within the IP telephone exchange base, and terminal-specific information, and performs conversion between the two. ID number-local number conversion tables 212 and 213 respectively.

  As a result of management by the IP telephone exchanges 202 and 203, as shown in the table 214, the terminal 204 is set with the local number 10 corresponding to the terminal specific information “a”, and the terminal 205 is shown in the table 215. Thus, the local number 20 is set corresponding to the terminal specific information “b”. Further, according to the processing sequence at the time of terminal movement, which will be described later, as shown in the table 215 ′, the terminal 205 has the local number 40 changed and set corresponding to the terminal unique information “b”.

  FIG. 3 shows a processing sequence at the time of terminal accommodation (position registration). In this figure, an example in which the terminal 204 or the terminal 205 is accommodated in either the IP telephone exchange 202 or the IP telephone exchange 203 is shown. Here, the case where the terminal 204 is accommodated in the IP telephone exchange 202 will be described below.

  First, it is assumed that the terminal 204 is activated by an operation such as power-on (step S101). The terminal 204 makes a connection request to the IP telephone exchange 202 (step S102). The IP telephone exchange 202 detects that the terminal 204 is connected, refers to the terminal-specific information for the terminal 204 to be accommodated (step S103), and assigns a local number that is a unique number within the base ( Step S104). Any terminal-specific information may be used as long as the information is uniquely held for each terminal such as the terminal MAC address. For example, the local number “10” is assigned to the terminal 204 (see FIG. 2). Next, the IP telephone exchange 202 transmits a connection permission together with the assigned local number to the terminal 204 (step S105).

  Next, the terminal 204 assigned with the local number determines whether or not an ID number is set for itself (step S106). When the ID number is not set, the terminal 204 is in a standby state until the ID number is set. If the ID number has been set, the terminal 204 notifies the IP telephone switch 202 of the ID number (step S107).

  Next, the IP telephone exchange 202 that has received the ID number from the terminal 204 stores the notified ID number in the ID number area corresponding to the local number of the terminal 204 in the ID-local number conversion table 212 (step S108). ). For example, the IP telephone exchange 202 stores the ID number “111” in the ID number area corresponding to the terminal unique information “a” of the terminal 204 in the ID-local number conversion table 212 (see FIG. 2). Through the above processing, a communication connection state is established between the terminal 204 and the IP telephone exchange 202.

  Next, the IP telephone exchange 202 transmits an ID registration notification to the IP telephone exchange 201 in order to notify that the terminal 204 set with the ID number “111” is accommodated in the IP telephone exchange 202 itself ( Step S109). The contents to be notified are an ID number and base information corresponding to the accommodated terminal.

  Next, the IP telephone exchange 201 receives the ID registration notification from the IP telephone exchange 202 and recognizes that the ID number “111” (terminal 204) is accommodated in the IP telephone exchange 202. Therefore, the IP telephone switch 201 registers the correspondence between the ID number “111” and the site A (IP telephone switch 202), that is, the ID position information in the ID position information table 211 (step S110).

  The IP telephone exchanges 201 and 202 perform the registration processing related to the terminal accommodation described above for all terminals (terminals 204 and 205) that have notified the ID number. As a result, the IP telephone switch 201 can manage in which base all ID numbers in the system are accommodated.

  FIG. 4 shows a processing sequence when the terminal moves. With reference to this figure, the operation when the terminal 205, which is a mobile terminal, moves from the base A (IP telephone exchange 202) to the base B (IP telephone exchange 203) will be described below.

  First, it is assumed that the terminal 205 is activated by an operation such as turning on the power (step S201). The terminal 205 makes a connection request to the IP telephone exchange 202 (step S202). The IP telephone exchange 202 detects that the terminal 205 is connected, refers to the terminal-specific information for the terminal 205 to be accommodated (step S203), and assigns a local number that is unique within the base ( Step S204). For example, the local number 20 is assigned to the terminal 205 (see FIG. 2). Next, the IP telephone exchange 202 transmits a connection permission together with the assigned local number to the terminal 205 (step S205).

  Next, the terminal 205 assigned with the local number determines whether or not an ID number is set for itself (step S206). When the ID number is not set, the terminal 205 is in a standby state until the ID number is set. If the ID number has been set, the terminal 205 notifies the IP telephone switch 202 of the ID number (step S207).

  Next, the IP telephone exchange 202 that has received the ID number from the terminal 205 stores the notified ID number in the ID number area corresponding to the local number of the terminal 205 in the ID-local number conversion table 212 (step S208). ). For example, the IP telephone exchange 202 stores the ID number “222” in the ID number area corresponding to the terminal unique information “b” of the terminal 205 in the ID-local number conversion table 212 (see FIG. 2). Through the above processing, a communication connection state is established between the terminal 205 and the IP telephone exchange 202.

  Next, the IP telephone exchange 202 transmits an ID registration notification to the IP telephone exchange 201 in order to notify that the terminal 205 set with the ID number “222” is accommodated in the IP telephone exchange 202 itself ( Step S209). The contents to be notified are an ID number and base information corresponding to the accommodated terminal.

  Next, the IP telephone exchange 201 receives the ID registration notification from the IP telephone exchange 202 and recognizes that the ID number “222” (terminal 205) is accommodated in the IP telephone exchange 202. Therefore, the IP telephone exchange 201 registers the correspondence between the ID number “222” and the site A (IP telephone exchange 202), that is, the ID position information, in the ID position information table 211 (step S210).

  Here, it is assumed that the terminal 205 has been powered off or the terminal 205 has left the base A wireless area. Therefore, the IP telephone exchange 202 detects disconnection of the terminal 205 (step S211). The IP telephone exchange 202 designates an ID number to the IP telephone exchange 201 in order to notify that the terminal 205 set with the ID number “222” has been released from the accommodation state in the IP telephone exchange 202 itself. The base information deletion request is transmitted (step S212). The IP telephone exchange 201 receives the deletion request from the IP telephone exchange 202 and recognizes that the ID number “222” (terminal 205) has been released from the IP telephone exchange 202. Therefore, the IP telephone switch 201 deletes the correspondence relationship between the ID number “222” and the base A (IP telephone switch 202) in the ID position information table 211, that is, the ID position information (step S213).

  It is assumed that the terminal 205 reaches the wireless area of the base B after the user of the terminal 205 moves between the bases. Here, it is assumed that the terminal 205 is activated again by an operation such as power-on (step S214). The terminal 205 makes a connection request to the IP telephone exchange 203 (step S215). The IP telephone switch 203 detects that the terminal 205 is connected, refers to the terminal-specific information for the terminal 205 to be accommodated (step S216), and assigns a local number that is a unique number within the base ( Step S217). For example, the local number 40 is assigned to the terminal 205 (see FIG. 2). Next, the IP telephone exchange 203 transmits a connection permission together with the assigned local number to the terminal 205 (step S218).

  Next, the terminal 205 assigned with the local number determines whether or not an ID number is set for itself (step S219). When the ID number is not set, the terminal 205 is in a standby state until the ID number is set. When the ID number has been set, the terminal 205 notifies the IP telephone switch 203 of the ID number (step S220).

  Next, the IP telephone exchange 203 that has received the ID number from the terminal 205 stores the notified ID number in the ID number area corresponding to the local number of the terminal 205 in the ID-local number conversion table 213 (step S221). ). For example, the IP telephone exchange 203 stores the ID number “222” in the ID number area corresponding to the terminal unique information “b” of the terminal 205 in the ID-local number conversion table 212 (see FIG. 2). Through the above processing, a communication connection state is established between the terminal 205 and the IP telephone exchange 203.

  Next, the IP telephone exchange 203 transmits an ID registration notification to the IP telephone exchange 201 in order to notify that the terminal 205 set with the ID number “222” is accommodated in the IP telephone exchange 203 itself ( Step S222). The contents to be notified are an ID number and base information corresponding to the accommodated terminal.

  Next, the IP telephone exchange 201 receives the ID registration notification from the IP telephone exchange 203 and recognizes that the ID number “222” (terminal 205) is accommodated in the IP telephone exchange 203. The IP telephone exchange 201 deletes the accommodation base A (IP telephone exchange 202) having the ID number “222”, and re-registers the accommodation base B (IP telephone exchange 203) in the terminal location information table 211 (step S223).

  Even if the terminal moves according to the above processing sequence, if an ID number is set for the terminal, the IP telephone switch 201 recognizes the ID number accommodating position, and which base the terminal is accommodated in. Can be managed.

  FIG. 5 shows a processing sequence when changing the ID number. With reference to this figure, the operation when the ID number is changed in fixed terminal 204 connected to site A (IP telephone exchange 202) will be described below. This is a case where the user sets his / her ID number when using the terminal for the terminal for which the user is not specified, and uses the terminal as his / her own terminal.

  First, the IP telephone exchange 202 performs a process for accommodating the terminal 204 (steps S301 to S310). Since this operation is the same as the terminal accommodation (ID location registration) sequence shown in FIG.

  Next, when the ID number of the terminal 204 is changed by the terminal operation of the terminal 204 (step S311), the terminal 204 transmits an ID number notification (step S312). The IP telephone exchange 202 that has received the ID number notification from the terminal 204 deletes the ID number before the change in the ID-local number conversion table 212 (step S313) and holds the ID number after the change (step S316). . Next, the IP telephone exchange 202 transmits an ID deletion notification including the ID number before the change and the base information to the IP telephone exchange 201 (step S314) and ID registration including the post-change ID number and the base information. A notification is transmitted (step S317).

  Next, the IP telephone switch 201 receives from the IP telephone switch 202 an ID deletion notification before the change and an ID registration notification after the change. Then, the pre-change ID is deleted from the ID position information table 211, and the post-change ID is registered (steps S315 and S318).

  Even when the ID number of the terminal is changed by the above processing, the IP telephone switch 201 can manage which location the ID number is accommodated by changing the position information table of the ID number. .

  In the above example, it is assumed that an ID number is set in the terminal. However, in the case of a terminal that cannot set the ID number, the ID number cannot be notified to the IP telephone exchange. In such a case, the ID number may be fixedly set in the ID-local number conversion table of the IP telephone exchange that accommodates the terminal. Further, instead of setting the ID number in the terminal, a method of notifying the ID number based on login information as a connection request may be used. As the login information, for example, a login ID of a personal computer on which a softphone is mounted, an ID number registered in a smart card connected to the terminal, or the like can be used.

  FIG. 6 shows a normal call sequence. With reference to this figure, an example of transmission from ID number 111 (terminal 204) to ID number "222" (terminal 205) will be described below.

  First, when the user of the terminal 204 dials the ID number “222”, the terminal 204 makes a call (step S401). Thereby, a transmission request is transmitted from the terminal 204 to the IP telephone exchange 202 (step S402). The IP telephone exchange 202 that has received the call request does not know in which location the ID number “222” as the destination is accommodated, and therefore starts to extract the destination number (step S403). That is, the IP telephone exchange 202 transmits a location information request to the IP exchange 201 (step S404).

  In response to the location information request, the IP telephone exchange 201 performs a location search with reference to the ID location information table 211 (step S405), and the ID number “222” is accommodated in the site B (IP telephone exchange 203). Recognize that The IP telephone exchange 201 responds with position information indicating that the ID number “222” is accommodated in the site B (step S406).

  By acquiring the location information of the ID number “222” from the IP telephone exchange 201, the IP telephone exchange 202 determines the location (base B) of the ID number “222” (terminal 205) as the destination base (step S407). ). Next, the IP telephone exchange 202 transmits a call origination request to the IP telephone exchange 203 (location B) (step S408).

  Next, the IP telephone exchange 203 that has received the call request from the IP telephone exchange 202 obtains the incoming call number, refers to the ID local number conversion table 213 held therein, and converts the ID number into a local number (step) S409). Next, the IP telephone exchange 203 causes the terminal 205 corresponding to the acquired local number to receive the outgoing call (step S410).

  When the terminal 205 that has received the call responds to this (step S411), a response signal is transmitted to the IP exchange 203, the IP exchange 202, and the terminal 204 (steps S412 to S414). Through the above processing, a call is made between the terminal 204 and the terminal 205 (step S415).

  FIG. 7 is a modification of the first embodiment, and shows a processing sequence at the time of a normal call using the SIP (Session Initiation Protocol) protocol. The terminal registration and location information inquiry processing in the normal call sequence shown in FIG. 6 may use a unique communication method, but can use the SIP protocol which is a call control protocol. In this case, the IP telephone exchange that manages the location information performs the same operation as the SIP redirect server. By using this implementation method, terminals other than SIP terminals, that is, analog telephones, PHS, etc. accommodated in IP telephone exchanges can be used without distinction from SIP terminals.

  First, in response to connection requests from the terminals 204 and 205 (steps S501 and S503), the IP telephone switches 202 and 203 perform terminal registration with the IP telephone switch 201 using a Register message (steps S502 and S503). S504). In response to the registration request using the SIP protocol, the IP telephone switch 201 performs location information registration (step S505).

  Thereafter, the call between the terminal 204 and the terminal 205 is realized from the inquiry of the position information by the process similar to the process sequence shown in FIG. 6 (steps S601 to S615). At this time, an Invite message (steps S604 and S608) is used in the outgoing operation, and a message such as 100 Trying or 200 OK (step S613) is used in the response operation to perform call control between the IP telephone exchanges.

  As described above, according to the first embodiment, it is possible to uniquely assign a number in the system by centrally managing the ID number position information without distinguishing between a fixed terminal and a mobile terminal. As a result, call control can be performed by using a unique number in the system without depending on the numbering plan of the IP telephone exchange.

In addition, if the IP telephone exchange that manages the location information and the IP telephone exchange that is arranged at each site that manages the terminal share the location information registration and inquiry procedures by a method such as using the SIP protocol, It may be an exchange that provides different services. This makes it possible to construct a system in which different exchanges are mixed.
<Second embodiment>
FIG. 8 shows the configuration of an IP telephone exchange system in the second embodiment of the present invention. Here, the IP telephone exchanges 501, 502 and 503 are exchanges which are connected via the IP network 206 and can communicate with each other, as in the first embodiment. The terminal 504 is the same terminal as the fixed terminal in the first embodiment. The terminal group 505 is a group composed of a plurality of terminals.

  In the second embodiment, in particular, the IP telephone exchange 503 has an ID-group number conversion table 513 therein. The ID-group number conversion table 513 is a table for associating an ID number similar to that in the description of the first embodiment with a terminal group in which a plurality of terminals accommodated in each base are grouped. Examples of the terminal group herein include an extension representative group, a DGL (Direct Group Line) incoming group, and a slide incoming group. In this embodiment, it is assumed that there is one terminal group 505 as an example.

  The operation in the second embodiment will be described with reference to this figure. First, the IP telephone exchange 503 refers to the ID-group number conversion table 513 when it is activated. At this time, if there is a terminal group to which an ID number is assigned in the ID-group number conversion table 513, the IP telephone exchange 503 registers the ID number assigned in the ID-group number conversion table 513. A notification is transmitted to the IP telephone switch 501.

  The IP telephone exchange 501 receives the ID number registration notification from the IP telephone exchange 503, recognizes that the group 505 set to the ID number “444” is accommodated in the IP telephone exchange 503, and stores it in the ID location information table 511. sign up. In this case, the group 505 is a group number including a plurality of terminals in the base of the IP telephone exchange 503, but the IP telephone exchange 501 handles this as one terminal accommodated in the IP telephone exchange 503.

  The IP telephone exchange 503 performs the above registration process for all groups registered in the ID-group number conversion table 513. As a result, the IP telephone exchange system can handle group incoming calls directed to the IP telephone exchange 503 by the same processing as the terminals in the system.

  Here, a case is assumed where the ID number “444” is dialed from the terminal 504 that has already undergone the terminal registration procedure. The IP telephone exchange 502 inquires of the IP telephone exchange 501 about the ID position information of the ID number “444”. The IP telephone exchange 501 returns the base B (IP telephone exchange 503) to the IP telephone exchange 502 as the ID position information of the ID number “444”. The IP telephone exchange 502 makes a call to the IP telephone exchange 503 because the accommodation position of the ID number “444” has been determined.

  The IP telephone exchange 503 that has received the call from the IP telephone exchange 502 converts the ID number “444” as the incoming call number into the group number X with reference to the ID-group number conversion table 513. The IP telephone exchange 503 performs a group incoming service for the group 505 corresponding to the converted group number X.

  In the second embodiment described above, it is possible to make a call using an ID number not only for an individual incoming number that individually designates a terminal at each site but also for a group system incoming number.

It is explanatory drawing explaining the mode of the terminal accommodation in a prior art. It is a block diagram which shows the structure of the IP telephone switching system in 1st Example of this invention. It is a sequence diagram which shows the process sequence at the time of terminal accommodation (at the time of position registration). It is a sequence diagram which shows the process sequence at the time of a terminal movement. It is a sequence diagram which shows the process sequence at the time of ID number change. It is a sequence diagram which shows the process sequence at the time of a normal call. It is a modified example of the first embodiment, and is a sequence diagram showing a processing sequence during a normal call using the SIP protocol. It is a block diagram which shows the structure of the IP telephone exchange system in 2nd Example of this invention.

Explanation of symbols

201, 202, 203, 501, 502, 503 IP telephone exchange 204, 205, 504 Terminal 206, 506 IP network 211, 511 ID location information table 212, 213, 512 ID-local number conversion table 214, 215, 215 ′, 514 Table 505 Terminal group 513 ID-group number conversion table

Claims (9)

A telephone exchange system comprising a plurality of telephone exchanges interconnected via a network and a plurality of mobile terminals each capable of being accommodated in any one of the telephone exchanges,
According to the current position of one of the mobile terminals, any one of the telephone exchanges is set as a destination telephone exchange, and accommodating means for accommodating the first mobile terminal therein
Registration means for registering a correspondence relationship between the terminal ID of the one mobile terminal and the base information of the accommodation destination telephone exchange each time the one mobile terminal is accommodated;
A discriminating means for discriminating base information corresponding to the destination ID from the correspondence relationship in response to a call origination request with any one of the terminal IDs as the destination ID;
An incoming means for receiving the call to the mobile terminal corresponding to the destination ID via the accommodation telephone exchange corresponding to the determined base information;
A telephone exchange system comprising:   In response to a communication connection request from the one mobile terminal to the accommodation destination telephone exchange, the accommodation destination telephone exchange holds the terminal ID of the one mobile terminal and uses the terminal ID to 2. The telephone exchange according to claim 1, wherein the mobile terminal is accommodated by identifying a mobile terminal and forming a communication connection state between the mobile terminal and the accommodation destination telephone exchange. system.   After registering the terminal ID of the first mobile terminal by the registration means, when the first mobile terminal is released from the accommodation state by the accommodation destination telephone exchange, the base information of the accommodation destination telephone exchange and the 2. The telephone exchange system according to claim 1, further comprising terminal ID deleting means for deleting a correspondence relationship with the terminal ID of the mobile terminal.   After registering the terminal ID of the one mobile terminal by the registration means, if there is an ID change request with a change terminal ID from the one mobile terminal, the previous correspondence relationship related to the one mobile terminal is 2. The telephone exchange system according to claim 1, further comprising ID changing means for changing the correspondence between the changed terminal ID and the base information of the accommodation telephone exchange.   2. The telephone exchange system according to claim 1, wherein the terminal ID comprises identification information unique throughout the system.   The telephone exchange system according to claim 1, wherein the terminal ID includes identification information of a user of the mobile terminal.   2. The telephone exchange system according to claim 1, wherein the terminal ID corresponds to a plurality of mobile terminals forming one group.   2. The telephone exchange system according to claim 1, wherein one of the telephone exchanges includes the registration means.   2. The telephone switching system according to claim 1, wherein the mobile terminal is a conventional telephone terminal or an IP telephone terminal.

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