JP6688082B2 - Communication system, communication method and program - Google Patents

Description

  The present invention relates to a communication system, a communication method and a program.

  Generally, companies have built their own extension systems having a plurality of telephones with extension numbers. Further, in the extension system, it is possible to respond to a telephone call made to an outside telephone number contracted for each base or organization by any of the telephones.

  In addition, in recent years, mobile communication operators have provided an extension service in which a mobile phone can be used as a part of a telephone in an extension system in a company. By using the extension service, users inside the company can easily contact other users regardless of where they are by simply dialing the extension number of the other user. Therefore, it is possible to improve the work efficiency.

JP, 2013-229747, A

  In the above-mentioned extension service, various functions related to extension calls are provided. As an example, there is a function to call between mobile phones subscribed to the main extension service by using the extension number, a function to answer a held call to an external number on the mobile phone subscribed to the main extension service, etc. is there.

  Various functions provided by the extension service are basically controlled based on the calling number when calling from the mobile phone. For example, when making a call between mobile phones that have subscribed to this extension service, if the call is made with an extension number, it is treated as an extension call, and if the call is made with an external number, it is not an extension line but an ordinary mobile phone call. Treated as a call. In addition, for example, when using the function of responding to a held call to an outside line number with a mobile phone, you can make a call from a mobile phone to a special number that is assigned in advance for each outside line number. The held call can be answered by the mobile phone.

  However, when using a mobile phone as an extension phone, the user needs to know in advance various numbers (such as extension numbers and special numbers of the other party) for using the functions provided by the extension service. there were. In addition, the user has to dial various numbers one by one, and it takes time to respond to a call on hold, which makes it difficult to respond promptly.

  The present invention has been made in view of the above, and an object of the present invention is to provide a technique capable of enhancing convenience when using a mobile phone as an extension phone.

  A communication system according to an embodiment of the present invention is a communication system including a terminal and a management device, wherein the management device stores a storage unit that stores information including a special number for responding to a hold call, And a notification means for notifying the terminal of the special number included in the information when the terminal requests the notification of the special number, and the terminal responds to the hold call from the user. When the instruction is accepted, the management device includes requesting means for requesting notification of the special number to the management device, and communication means for making a call using the special number notified from the management device.

  According to the embodiment of the present invention, there is provided a technique capable of improving convenience when using a mobile phone as an extension phone.

It is a figure which shows the structural example of the communication system which concerns on 1st embodiment. It is a figure showing an example of functional composition of a terminal and a controlling device concerning a first embodiment. It is a figure which shows an example of a telephone directory. It is a sequence diagram which shows the operation example of the communication system which concerns on 1st embodiment. It is a figure which shows the example of a display of a pick-up button. It is a sequence diagram which shows the operation example of the communication system which concerns on 2nd embodiment. It is a figure which shows an example of the functional structure of the management apparatus and PBX which concern on 3rd embodiment. It is a figure which shows an example of prefix information. It is a sequence diagram which shows the operation example of the communication system which concerns on 3rd embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. Although the following embodiments are premised on a communication system used in a company, the embodiments of the present invention can be applied to a communication system used by any organization regardless of the company. It is possible.

[First Embodiment]
<System configuration>
FIG. 1 is a diagram showing a configuration example of a communication system according to the first embodiment. The communication system includes a terminal 10, a management device 20, a PBX (Private Branch eXchange) 30, and a fixed telephone 40. In the example of FIG. 1, only one terminal 10 is shown, but for convenience, a plurality of terminals may be provided. The terminal 10, the management device 20, and the PBX 30 are connected to a PLMN (Public Land Mobile Network) provided by a mobile communication operator.

  The PBX 30 and the fixed telephone 40 are intended to be a switchboard and a telephone used in an extension system (hereinafter simply referred to as "extension system") uniquely constructed in a company. In FIG. 1, one PBX 30 and one fixed telephone 40 are illustrated, but for convenience, there may be a plurality of each. For example, in the communication system according to the first embodiment, the PBX 30 may be installed so that one PBX 30 covers all the bases and organizations, or the PBX 30 is provided for each base or organization in the company. It may be installed.

  In the first embodiment, a mobile communication operator who provides a PLMN provides an extension service (hereinafter, simply referred to as “extension service”) in which a mobile phone can be used as a part of a telephone in an extension system. Assuming that That is, it is assumed that the PLMN shown in FIG. 1 has an extension service providing device (switch, server, etc.) for providing an extension service.

  The terminal 10 has a function of making a call via the PLMN. The terminal 10 is, for example, a mobile phone, a tablet terminal, a smartphone, or the like, but any terminal (for example, a PC having a built-in or external communication unit (as long as it has a function of making a call via the PLMN is used. Personal Computer))). It is assumed that the terminal 10 can use the extension service (contracts for the extension service) and that the terminal 10 is assigned a unique extension number.

  The management device 20 has a function of providing various numbers for using the function provided by the extension service in response to a request from the terminal 10. The management device 20 can mutually communicate with the terminal 10. The management device 20 may communicate with the terminal 10 via the PLMN, or may communicate with the terminal 10 via another network such as a wireless LAN instead of the PLMN. . The management device 20 may be, for example, a general computer such as a PC or a server.

  The PBX 30 is an exchange used in the extension system, and has various functions for realizing an extension call made between the fixed telephones 40 connected to the PBX 30. Further, the PBX 30 is connected to a PSTN (Public Switched Telephone Network), and has a function of making an outside call and receiving an outside line by an outside line number allocated by a contract with a fixed communication operator who provides the PSTN. is doing. Further, the PBX 30 is connected to an extension service providing device included in the PLMN, and has a function of realizing an extension call between the terminal 10 and the fixed telephone 40, a function of realizing an outside call from the terminal 10 via the PBX 30, and the like. is doing. The PBX 30 may be a PBX independently installed by a company, a PBX lent by the mobile communication operator as a part of extension service, or a virtual PBX on the cloud. May be

  The fixed telephone 40 is a telephone used in the extension system. The fixed telephone 40 is not limited to a fixedly installed telephone, and may be a wirelessly movable telephone. An extension number unique to the fixed-line telephone 40 is assigned to the fixed-line telephone 40. The extension number unique to the fixed-line telephone 40 and the extension number unique to the terminal 10 are assigned so as not to overlap, and the user in the company dials either extension number to make a call It is possible to make an extension call without paying particular attention to whether the user is using the fixed telephone 40 or the terminal 10.

<Functional configuration>
FIG. 2 is a diagram illustrating an example of functional configurations of the terminal and the management device according to the first embodiment.

(Terminal)
As shown in FIG. 2A, the terminal 10 includes a communication unit 101, a UI (User Interface) unit 102, and a request unit 103. Each of these units can be realized by a process that causes the CPU of the terminal 10 to execute one or more programs installed in the terminal 10.

  The communication unit 101 has various functions (calling function, call receiving function, etc.) for wirelessly connecting to the PLMN and performing voice communication or packet communication.

  The UI unit 102 displays various icons and information on the screen of the terminal 10 using a touch panel, a screen, operation buttons, and the like included in the terminal 10, and receives various instructions from the user.

  The request unit 103 has a function of requesting (inquiring) various numbers for using the functions provided by the extension service to the management device 20. Further, the request unit 103 instructs the communication unit 101 to make a call using the various numbers notified from the management device 20.

(Management device)
As shown in FIG. 2B, the management device 20 has a notification unit 201 and a storage unit 202. Each of these units can be realized by a process that causes the CPU of the management device 20 to execute one or more programs installed in the management device 20. The notification unit 201 and the storage unit 202 may be realized by using different computers, or the computers may be dispersed in smaller units. That is, the management device 20 may be realized using one or more computers. Further, the one or more computers may be virtual servers that utilize virtualization technology, or may be virtual servers implemented on the cloud.

  When the notification unit 201 receives a request (inquiry) from the terminal 10, the notification unit 201 refers to the telephone directory stored in the storage unit 202 and outputs various numbers for using the functions provided by the extension service to the terminal. 10 has a function of notifying.

  A telephone directory is stored in the storage unit 202. The storage unit 202 can be realized using a storage device (memory, HDD, etc.) included in the management device 20, a storage device connectable to the management device 20 via a network, or the like.

  FIG. 3 is a diagram showing an example of a telephone directory. As shown in FIG. 3, the phonebook stored in the storage unit 202 stores a phonebook for each individual and a phonebook for each organization. “Name” indicates an individual name or an organization name. The “type” indicates whether each record in the phone book is a personal phone book or an organization phone book.

  The "pickup special number" is a special number that is pre-assigned by the mobile communication operator that provides the extension service for each outside line number and is used when picking up (holding incoming call) a held call (holding incoming call). . In other words, the pick-up special number is not a number managed by the company that builds the extension system (it is determined independently), but a number managed by the extension service provided by the mobile communication operator. The special number means a special number different from a normal telephone number (for example, a telephone number starting from 0).

  The example of FIG. 3 shows that the user can answer the hold call that has been made to the outside line number (0451111111) of organization X by dialing the special number (2001) from the terminal 10. Similarly, the user dials the special number (2002) from the terminal 10 to indicate that he / she can respond to the held call placed on the outside line number (0452222222) of organization Y.

  The "external line number" is a telephone number assigned by a contract with a mobile communication operator or a fixed communication operator. In the example of FIG. 3, the external line numbers of the individuals A to C are telephone numbers assigned by the contract with the mobile communication operator, and the external line numbers of the organizations X to Z are the telephone numbers assigned by the contract with the fixed communication operator. It is a number. The "extension number" is an extension number used in the extension system. In the example of FIG. 3, the extension numbers of the individuals A to C are extension numbers assigned by the mobile communication operator, and the extension numbers of the organizations X to Z are extension numbers assigned by the setting of the PBX 30.

  “Affiliation” indicates to which organization each individual belongs. In the example of FIG. 3, it is shown that the individuals A to C belong to the organization X, the individuals D and E belong to the organization Y, and the individuals F and G belong to the organization Z. . The "affiliation" of each individual in the telephone directory is appropriately changed according to personnel changes and the like. For example, when the individual A is transferred from the organization X to the organization Y due to a personnel change or the like, the telephone directory is updated so that the individual A belongs to the organization Y instead of the organization X.

<Operation example of communication system>
FIG. 4 is a sequence diagram showing an operation example of the communication system according to the first embodiment. In FIG. 4, an individual A who uses the terminal 10 of the individual A who has received a call from the fixed telephone of the organization X by a customer or the like who wants to act as an agent for the individual A belonging to the organization X. It is supposed to answer the phone. In the following description, it is assumed that the phonebook stores the records shown in FIG.

  In step S101, the PBX 30 receives a call addressed to the organization X (a call whose destination is 0451111111).

  In step S102, the PBX 30 calls the landline phone 40 of organization X.

  In step S103, the user who receives the incoming call presses the hold button of the fixed telephone 40.

  In step S104, the fixed line telephone 40 transmits a hold instruction signal to the PBX 30.

  In step S105, the PBX 30 puts the call received in step S101 on hold.

  In step S106, the user who receives the incoming call notifies the individual A that the customer has called the landline phone 40 of the organization X and is on hold.

  In step S107, the individual A presses the pickup button displayed on the screen of the terminal 10 to answer the call on hold. The UI unit 107 of the terminal 10 recognizes that the pickup button has been pressed.

  Here, a display example of the pickup button displayed on the screen of the terminal 10 will be described with reference to FIG. The example of FIG. 5A shows an example in which the pickup button is displayed in the menu displayed after the application for controlling the extension service is activated, and the example of FIG. Shows an example in which a pickup button (pickup icon) is displayed in addition to the icon for starting the application for controlling the extension service on the top screen. In the example of FIG. 5B, a pickup button (pickup icon) is displayed on the top screen, so that the user can respond to the held call more quickly than in the example of FIG. 5A. Returning to FIG. 4, the description will be continued.

  In step S108, the request unit 103 of the terminal 10 transmits a pick-up special number request signal to the management device 20. The pickup special number request signal includes the extension number (61001) of the terminal 10 itself.

  In step S109, the notification unit 201 of the management device 20 acquires the pick-up special number (2001) by searching the telephone directory using the extension number (61001) included in the pick-up special number request signal. More specifically, the notification unit 201 identifies the user (individual A) corresponding to the extension number by searching the telephone directory using the extension number (61001) received in the processing procedure of step S108 as a key. . Next, the notification unit 201 identifies the organization (organization X) to which the identified user (individual A) belongs, and acquires the pick-up special number (2001) corresponding to the identified organization.

  In step S110, the notification unit 201 of the management device 20 transmits a pick-up special number response signal including the pick-up special number (2001) to the terminal 10.

  In step S111, the request unit 103 of the terminal 10 instructs the communication unit 101 to make a call using the special pick-up number (2001) notified from the management device 20. The communication unit 101 makes a call to the pickup special number (2001) instructed by the request unit 103. The control signal related to the call originated from the terminal 10 is transmitted to the PBX 30 via each device in the PLMN (base station, exchange, and extension service providing device provided in the PLMN). This is because the pick-up special number is a special number assigned by the mobile communication operator, and each device in the PLMN can recognize that the control signal related to the call originated by the special number should be transferred to the PBX 30. Because you can.

  In step S112, the PBX 30 releases the hold of the call received in step S101, and connects the line related to the call whose hold has been released to the extension service providing device. The line is connected to the terminal 10 via each device in the PLMN, and a call is started between the terminal 10 and the customer's telephone.

  The operation example of the communication system according to the first embodiment has been described above. According to the first embodiment, the management device 20 notifies the terminal 10 of the special pick-up number for responding to the held call. Therefore, the user (individual A) can respond to the hold call without dialing the special pick-up number when responding to the hold call at the terminal 10. Further, the user (individual A) can respond to the hold call without knowing the pickup special number when responding to the hold call at the terminal 10. In addition, even if the organization to which the user belongs has been changed due to a change, etc., the user can still answer the held call without knowing the pickup special number corresponding to the changed organization. Become.

[Second embodiment]
Subsequently, a second embodiment will be described with reference to the drawings. Note that points that are not particularly mentioned may be the same as those in the first embodiment.

<Operation example of communication system>
FIG. 6 is a sequence diagram showing an operation example of the communication system according to the second embodiment. In FIG. 6, the terminal 10 of the individual A is described as “terminal 10a”, and the terminal 10 of the individual C is described as “terminal 10c”. In FIG. 6, it is assumed that the individual A makes a call from the terminal 10a of the individual A to the terminal 10c of the individual C. Further, when the individual A makes a call, he / she does not know the extension number of the terminal 10c of the individual C and dials the external number of the terminal 10c (or, if he / she knows the extension number, dials the external number by mistake. The situation is assumed. In the following description, it is assumed that the phonebook stores the records shown in FIG.

  In step S201, the UI unit 107 of the terminal 10a receives, from the individual A, selection (or input) of the outside line number (090333333333) of the individual C and pressing of the call button.

  In step S202, the request unit 103 of the terminal 10a transmits an extension number search request signal including the destination external number (090333333333) to the management device 20.

  In step S203, the notification unit 201 of the management device 20 acquires the extension number (61003) corresponding to the extension number by searching the telephone directory using the extension number (090333333333) included in the extension number search request signal. To do.

  In step S204, the notification unit 201 of the management device 20 transmits an extension number search response signal including the extension number (61003) to the terminal 10. If the extension number corresponding to the external number does not exist in the telephone directory, the notification unit 201 of the management device 20 may transmit the information indicating that the extension number corresponding to the external number does not exist to the terminal 10. Good.

  In step S205, the request unit 103 of the terminal 10 instructs the communication unit 101 to make a call using the extension number (61003). The communication unit 101 makes a call to the extension number (61003) instructed by the request unit 103. The control signal related to the call originated from the terminal 10 is transmitted to the terminal 10c via each device in the PLMN (the base station, the exchange, and the extension service providing device provided in the PLMN). This is because the extension number of the terminal 10c is assigned by the mobile communication operator, and each device in the PLMN can recognize that the terminal to which the extension number is assigned is the terminal 10c.

  In step S112, a call is started between the terminals 10a and 10c.

  The operation example of the communication system according to the second embodiment has been described above. According to the second embodiment, the extension number of the terminal 10 is notified from the management device 20 to the terminal 10. Therefore, the user (individual A) can make an extension phone call to the terminal 10c without dialing the extension number of the terminal 10c when calling from the terminal 10a to the terminal 10c. Further, the user (individual A) can make an extension call to the terminal 10c without knowing the extension number of the terminal 10c. Further, even if the user mistakenly dials an outside line number, it is automatically converted into an extension number, so that it is possible to save a call charge, for example.

[Third Embodiment]
Subsequently, a third embodiment will be described with reference to the drawings. When the PBX 30 according to the third embodiment receives the destination telephone number including the prefix corresponding to each of the various functions of the PBX 30 itself, the prefix is used in the call processing related to the call via the PBX 30. Has a function of operating a function corresponding to. Note that points not particularly mentioned may be the same as those in the first embodiment or the second embodiment.

<Functional configuration>
FIG. 7 is a diagram illustrating an example of functional configurations of the management device and the PBX according to the third embodiment.

(Management device)
As shown in FIG. 7A, the management device 20 has a notification unit 301 and a storage unit 302.

  When the notification unit 301 receives a request (inquiry) from the terminal 10, the notification unit 301 refers to the prefix information stored in the storage unit 202 and uses the function provided by the PBX to operate (operate). It has a function of notifying the terminal 10 of the fixture. The storage unit 302 stores prefix information in addition to the telephone directory.

  FIG. 8 shows an example of the prefix information. “Function name” indicates the name of the function of the PBX 30. “Prefix” indicates a prefix corresponding to “function name”. In the example of FIG. 8, it is shown that the function A is a source number conversion function and the prefix corresponding to the function is “8”. The calling party number conversion function is intended to mean a function of the PBX 30 to convert a calling party telephone number (external number or extension number) to an external number of the organization to which the user corresponding to the telephone number belongs. ing. The caller telephone number conversion function is an example, and the third embodiment is not limited to this, and can be applied to any function of the PBX.

(PBX)
As shown in FIG. 7B, the PBX 30 has a function execution unit 401, a storage unit 402, and a PSTN communication unit 403. Each of these units can be realized by a process that one or more programs installed in the PBX 30 cause the CPU of the PBX 30 to execute.

  The function execution unit 401 executes various functions included in the PBX. The function execution unit 401 has a function of referring to the telephone directory stored in the storage unit 402 as needed.

  A telephone directory is stored in the storage unit 402. The storage unit 402 can be realized by using a storage device (memory, HDD, etc.) included in the PBX 30, a storage device connectable to the PBX 30 via a network, or the like. The phone book stored in the storage unit 402 is the same as the phone book shown in FIG. The PBX 30 may not hold the storage unit 402. In this case, the function execution unit 401 may inquire of the management device 20 about the contents of the telephone directory, if necessary.

  The PSTN communication unit 403 has various functions (calling function, call receiving function, etc.) for connecting to the PSTN and performing a voice call.

<Operation example of communication system>
FIG. 9 is a sequence diagram showing an operation example of the communication system according to the third embodiment. FIG. 9 assumes a situation in which the terminal 10 of the individual A makes a call to the customer by using the above-mentioned source number conversion function (function A). In the following description, it is assumed that the phonebook stored in the storage unit 302 of the management device 20 and the storage unit 402 of the PBX 30 stores the records shown in FIG.

  In step S301, the UI unit 107 of the terminal 10a selects (or inputs) the customer's external line number (0457777777) from the individual A, issues an instruction to use the above-mentioned calling party number conversion function (function A), and issues a call. Accepts pressing the call button.

  In step S302, the request unit 103 of the terminal 10a transmits a prefix inquiry signal to the management device 20. The prefix inquiry signal includes the outside line number (0457777777) of the customer who is the destination and the information indicating the source number conversion function (function A). The information indicating the source number conversion function (function A) may be a unique identifier for each function or the like, and is not limited to this, and may be any information. For example, when the prefix inquiry signal includes the extension number of the terminal 10, it may be meant that the prefix inquiry signal includes information indicating the source number conversion function (function A). .

  In step S303, the notification unit 301 of the management device 20 acquires the prefix (8) corresponding to the function by searching the prefix information using the information indicating the source number conversion function (function A). .

  In step S304, the notification unit 201 of the management device 20 adds the prefix to the outside line number of the callee included in the prefix inquiry signal. Further, the notification unit 201 transmits to the terminal 10 a prefix inquiry response signal that includes the outside line number (804577777777) of the callee to which the prefix is added.

  In step S305, the request unit 103 of the terminal 10 instructs the communication unit 101 to make a call by using the outside line number (80445777777) of the callee to which the prefix is added. The communication unit 101 makes a call to the outside line number (80457777777) instructed by the request unit 103. Note that the communication unit 101 includes the extension number (61001) of itself as the telephone number of the caller in the control signal related to the call. The control signal related to the call originated from the terminal 10 is transmitted to the PBX 30 via each device (base station, exchange, and extension service providing device provided in the PLMN) in the PLMN.

  In step S306, the function execution unit 401 of the PBX 30 confirms whether or not the prefix is added to the outside line number of the transmission destination included in the received control signal. In the example of FIG. 9, the function execution unit 401 of the PBX 30 confirms that “8” is added as a prefix, and recognizes that it is necessary to operate the above-mentioned calling party number conversion function (function A). It will be.

  In step S307, the function execution unit 401 of the PBX 30 operates the source number conversion function (function A). Specifically, the function executing unit 401 identifies the user (individual A) having the extension number by searching the telephone directory using the extension number (61001) of the transmission source included in the received control signal as a key. To do. Next, the function execution unit 401 identifies the organization (organization X) to which the identified user (person A) belongs, and acquires the outside line number (0451111111) corresponding to the identified organization.

  In step S308, the PSTN communication unit 403 of the PBX 30 sets the telephone number (0457777777) excluding the prefix "8" as the destination telephone number, and the outside line number of the organization X (0451111111) as the source telephone number. Set and make a call. As a result, the external line number of organization X is displayed on the customer's telephone as the sender, not the external line number of terminal A.

  The operation example of the communication system according to the third embodiment has been described above. According to the third embodiment, the prefix for operating various functions of the PBX 30 is notified from the management device 20 to the terminal 10. Therefore, when using the function of the PBX 30, the user (individual A) can operate the function of the PBX 30 without assigning the prefix to the telephone number of the callee and dialing. Further, the user (individual A) can operate the function of the PBX 30 without knowing the prefix corresponding to each of the various functions of the PBX 30.

<Supplement to Embodiment>
The respective embodiments can be arbitrarily combined. That is, the first embodiment and the second embodiment may be combined, the first embodiment and the third embodiment may be combined, and the second embodiment. And the third embodiment may be combined, or the first embodiment, the second embodiment and the third embodiment may be combined.

  The terminal 10 may include each functional unit included in the management device 20. As a result, the terminal 10 can realize the processing according to each embodiment without accessing the management device 20.

  As described above, the functional units included in the terminal 10, the management device 20 and the PBX 30 according to the respective embodiments use the hardware resources such as the CPU and the memory provided therein to perform the processes performed by the management device 20 and the PBX 30, respectively. Can be realized by executing a program corresponding to. Further, the program can be stored in a storage medium.

  In each embodiment, the organization is an example of “group”. The extension number of the terminal 10 is an example of “information for identifying a group to which the terminal belongs”. The telephone directory or prefix information is an example of “information”.

10 terminal 20 management device 30 PBX
101 communication unit 102 UI unit 103 request unit 201, 301 notification unit 202, 302 storage unit 401 function execution unit 402 storage unit 403 PSTN communication unit

Claims (5)

A communication system having a terminal and a management device,
The management device is
Storage means for storing information including a special number for answering the held call,
A notification means for notifying the terminal of the special number included in the information when the terminal is requested to notify the special number,
Have
The terminal is
When accepting an instruction from the user to answer the hold call, requesting means for requesting notification of the special number to the management device,
Communication means for making a call using the special number notified from the management device;
A communication system having. The information is associated with the special number and one or more terminals belonging to a group corresponding to the special number,
The request unit, when requesting the notification of the special number from the management device, notifies the management device of information for specifying a group to which the terminal belongs,
The notifying means notifies the terminal of the special number corresponding to the group to which the terminal belongs,
The communication system according to claim 1. A terminal connected to a public mobile phone network, a management device capable of communicating with the terminal via the public mobile phone network, a terminal capable of communicating with the terminal via the public mobile phone network, and included in an extension system A communication system having an exchange that is
The management device is
Storage means for storing prefix information in which one or more functions and a prefix associated with the one or more functions are associated with each other;
When a prefix inquiry request including an outside line number and information indicating a predetermined function is received from the terminal via the public mobile telephone network, a prefix corresponding to the predetermined function is obtained from the prefix information. Then , after giving the outside line number, a notification means for notifying the terminal of the outside line number to which the prefix has been given to the terminal via the public mobile telephone network,
Have
The terminal is
Requesting means for requesting a prefix inquiry request including an external line number and information indicating a predetermined function to the management device via the public mobile telephone network in order to use the predetermined function,
The notified from the management apparatus, the predetermined destination number outside line number prefix is assigned corresponding to the function, as the source ID the extension number of the extension system of the terminal, via the public mobile telephone network Communication means for making a call by
Have
The exchange is
A function execution unit that acquires a prefix included in a signal called from the terminal and executes a predetermined function corresponding to the acquired prefix,
A communication system having. A communication method executed by a communication system having a terminal and a management device, comprising:
A step in which the management device stores information including a special number for answering the held call in the storage means;
When the terminal receives an instruction from the user to respond to the held call, requesting the notification of the special number from the management device,
When the management device is requested from the terminal to notify the special number, a step of notifying the terminal of the special number included in the information,
A step in which the terminal makes a call using the special number notified from the management device;
And a communication method.   A program that causes a computer to function as each unit of the terminal or the management apparatus according to any one of claims 1 to 3.

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