JP7043476B2 - Communication system and communication method - Google Patents

Description

The present invention relates to communication systems and communication methods .

In general, a company is building its own extension system with multiple telephones with extension numbers. Further, in the extension system, it is possible to answer a call to an outside line number contracted for each base or organization by any of the telephones.

Also, in recent years, mobile communication operators have provided extension services that allow mobile phones to be used as part of a telephone in an extension system within an enterprise. By using the extension service, users in the company can easily contact the extension number of another user regardless of the location of the other user. Therefore, it is possible to improve work efficiency.

Japanese Unexamined Patent Publication No. 2013-229747

The above-mentioned extension service provides various functions related to extension calls. As an example, there is a function to make a call using an extension number between mobile phones subscribed to the main extension service, and a function to answer a hold call to an outside line number with a mobile phone subscribed to the main extension service. be.

The various functions provided by this extension service are basically controlled based on the dialing number when making a call from a mobile phone. For example, when making a call between mobile phones 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 outside line number, it is between normal mobile phones instead of an extension. Treated as a call. In addition, for example, when using the function of answering a hold call to an outside line number with a mobile phone, the mobile phone can call the special number assigned in advance for each outside line number to the outside line number. You can answer the hold call on your mobile phone.

However, when using a mobile phone as an extension phone, the user needs to know in advance various numbers (extension numbers, special numbers, etc. 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 may take a long time to answer the hold call, which may make 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 telephone.

The communication system according to the embodiment of the present invention is a communication system having a terminal and a management device, and the management device stores information in which an outside line number and an extension number of one or more terminals are associated with each other. The terminal has a storage means and a notification means for acquiring an extension number from the information and notifying the terminal when the terminal requests notification of an extension number corresponding to the outside line number of the call destination. Has a requesting means for requesting notification of an extension number corresponding to an outside line number of a destination received from a user, and a communication means for making a call using the extension number notified from the management device.

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

It is a figure which shows the structural example of the communication system which concerns on 1st Embodiment. It is a figure which shows an example of the functional structure of the terminal and the management apparatus which concerns on 1st 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 display example of a pickup 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 concerns on 3rd Embodiment. It is a figure which shows an example of a 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. It should be noted that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments. The following embodiments are premised on a communication system used in a company, but the embodiments of the present invention may be applied to a communication system used in 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, there may be a plurality of terminals 10. 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-line telephone 40 are intended to be exchanges and telephones used in an extension system (hereinafter, simply referred to as “extension system”) independently constructed in a company, respectively. In FIG. 1, one PBX 30 and one fixed telephone 40 are shown, 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 may be installed for each base or organization in the company. It may be installed.

In the first embodiment, the mobile communication operator providing the PLMN provides an extension service (hereinafter, simply referred to as "extension service") capable of using a mobile phone as a part of a telephone in an extension system. It is assumed that it is. That is, it is assumed that the PLMN shown in FIG. 1 has an extension service providing device (exchange, server, etc.) for providing the 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 PLMN (for example, a PC having a built-in or external communication unit). Personal Computer), etc.). It is assumed that the terminal 10 can use the extension service (the extension service has been contracted) and the extension number unique to the terminal 10 is assigned.

The management device 20 has a function of providing various numbers for using the functions provided by the extension service in response to a request from the terminal 10. The management device 20 can 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 an extension system, and has various functions for realizing an extension call made between fixed telephones 40 connected to the PBX 30. In addition, the PBX30 is connected to the PSTN (Public Switched Telephone Network) and has a function of making and receiving an outside line by an outside line number assigned by a contract with a fixed communication operator that provides the PSTN. is doing. Further, the PBX 30 is connected to the extension service providing device of 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 line transmission from the terminal 10 via the PBX 30, and the like. is doing. The PBX 30 may be a PBX installed independently by the company, a PBX lent by the mobile communication operator as part of the extension service, or a virtual PBX on the cloud. May be.

The landline telephone 40 is a telephone used in an extension system. The fixed telephone 40 is not necessarily a fixedly installed telephone, but may be a telephone that can be moved wirelessly. The fixed-line telephone 40 is assigned an extension number unique 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 described above are assigned so as not to overlap, and the user in the company can dial one of the extension numbers to make a call. It is possible to make an extension call without being particularly conscious of whether the user of the fixed telephone 40 is using the fixed telephone 40 or the terminal 10.

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

(Terminal)
As shown in FIG. 2A, the terminal 10 has a communication unit 101, a UI (User Interface) unit 102, and a request unit 103. Each of these parts can be realized by a process in which one or more programs installed in the terminal 10 are executed by the CPU of the terminal 10.

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

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

The requesting unit 103 has a function of requesting (inquiring) various numbers for using the functions provided by the extension service from the management device 20. Further, the requesting unit 103 instructs the communication unit 101 to make a call using 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 parts can be realized by a process of causing 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 distributed in finer units. That is, the management device 20 may be realized by using one or a plurality of computers. Further, the one or more computers may be a virtual server using virtualization technology, or may be a virtual server 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 assigns various numbers for using the functions provided by the extension service to the terminal. It has a function of notifying 10.

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

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

The "special number for pick-up" is a special number that is pre-assigned to each outside line number by a mobile communication operator that provides an extension service and is used when picking up a held call (pending incoming call) (answering a held call). .. That is, the pick-up special number is not a number managed (determined independently) by the company that constructs the extension system, but a number managed by the extension service side 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).

In the example of FIG. 3, it is shown that the user can answer the hold call made to the outside line number (0451111111) of the organization X by dialing the special number (2001) from the terminal 10. Similarly, it is shown that the user can answer the hold call made to the outside line number (0452222222) of the organization Y by dialing the special number (2002) from the terminal 10.

The "outside 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 outside line numbers of the individuals A to C are telephone numbers assigned by the contract with the mobile communication operator, and the outside 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 the extension numbers assigned by the mobile communication operator, and the outside line numbers of the organizations X to Z are the extension numbers assigned by the setting of the PBX 30.

"Affiliation" indicates which organization each individual belongs to. In the example of FIG. 3, it is shown that individuals A to C belong to organization X, individuals D and E belong to organization Y, and individuals F and G belong to organization Z. .. The "affiliation" of each individual in the telephone directory will be changed as appropriate 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, a customer or the like who wishes to transfer to an individual A belonging to the organization X has a call to the fixed telephone of the organization X, and the individual A who is informed that the call has been made uses the terminal 10 of the individual A. Imagine a situation where you answer the phone. In the following description, it is assumed that the record shown in FIG. 3 is stored in the telephone directory.

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 telephone 40 of the organization X.

In step S103, the hold button of the fixed telephone 40 is pressed by the user who received the incoming call.

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

In step S105, the PBX 30 puts the call received in step S101 into a pending state.

In step S106, the user who received the incoming call notifies the individual A that the customer has called the fixed telephone 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 in order to answer the pending call. 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 of displaying the pickup button in the menu displayed after starting the application for controlling the extension service, and the example of FIG. 5B shows the terminal 10 An example of displaying a pickup button (pickup icon) in addition to the icon for starting the application that controls the extension service is shown on the top screen of. In the example of FIG. 5B, since the pickup button (pickup icon) is displayed on the top screen, the user can answer the hold call more quickly than the example of FIG. 5A. Returning to FIG. 4, the explanation will be continued.

In step S108, the request unit 103 of the terminal 10 transmits a pickup 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 pickup special number (2001) by searching the telephone directory using the extension number (61001) included in the pickup 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 specified user (individual A) belongs, and acquires the pick-up special number (2001) corresponding to the specified organization.

In step S110, the notification unit 201 of the management device 20 transmits a pickup special number response signal including the pickup 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 pick-up special number (2001) notified from the management device 20. The communication unit 101 makes a call to the pick-up special number (2001) instructed by the request unit 103. The control signal related to the call issued from the terminal 10 will be transmitted to the PBX 30 via each device in the PLMN (base station, exchange, and extension service providing device included in the PLMN). This means that the pick-up special number is a special number assigned by the mobile communication operator, and each device in the PLMN recognizes that the control signal related to the call made by the special number should be transferred to the PBX30. Because it can be done.

In step S112, the PBX 30 releases the hold of the call received in step S101, and connects the line related to the call for which the hold is 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 pick-up special number for answering the hold call is notified from the management device 20 to the terminal 10. Therefore, when answering the hold call on the terminal 10, the user (individual A) can answer the hold call without dialing the pick-up special number by himself / herself. Further, when answering the hold call on the terminal 10, the user (individual A) can answer the hold call without knowing the pick-up special number. In addition, even if the organization to which the user belongs is changed due to a transfer, etc., the user can answer the hold call without knowing the special pick-up number corresponding to the organization after the transfer. Become.

[Second embodiment]
Subsequently, the second embodiment will be described with reference to the drawings. It should be noted that the points 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". FIG. 6 assumes a situation in which an individual A makes a call from the terminal 10a of the individual A to the terminal 10c of the individual C. Further, when making a call, the individual A did not know the extension number of the terminal 10c of the individual C and dialed the outside line number of the terminal 10c (or, although he knew the extension number, he mistakenly dialed the outside line number. I assumed the situation. In the following description, it is assumed that the record shown in FIG. 3 is stored in the telephone directory.

In step S201, the UI unit 107 of the terminal 10a receives from the individual A the selection (or input) of the outside line number (090333333333) of the individual C and the 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 outside line number (090333333333) of the transmission destination 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 outside line number by searching the telephone directory using the outside line number (090333333333) included in the extension number search request signal. 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 outside line number does not exist in the telephone directory, the notification unit 201 of the management device 20 may transmit information indicating that the extension number corresponding to the outside line 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 made from the terminal 10 is transmitted to the terminal 10c via each device (base station, exchange and extension service providing device included in the PLMN) 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 terminal 10a and the terminal 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 call to the terminal 10c without dialing the extension number of the terminal 10c by himself / herself when making a call 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 call charges and the like, for example.

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

<Functional configuration>
FIG. 7 is a diagram showing an example of the functional configuration 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 (operates) the function provided by the PBX. It has a function of notifying the terminal 10 of the fix. The storage unit 302 stores prefix information in addition to the telephone directory.

FIG. 8 shows an example of prefix information. The "function name" indicates the name of the function included in 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 caller ID conversion function, and the prefix corresponding to the function is “8”. The caller ID conversion function is intended to be a function of converting the caller's telephone number (external line number or extension number) into the external line number of the organization to which the user corresponding to the telephone number belongs in PBX30. ing. The calling telephone number conversion function is an example, and the third embodiment is not limited to this, and can be applied to any function provided in 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 parts can be realized by a process in which one or more programs installed in the PBX 30 are executed by the CPU of the PBX 30.

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, if necessary.

The 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 that can be connected to the PBX 30 via a network, and the like. Since the telephone directory stored in the storage unit 402 is the same as the telephone directory shown in FIG. 3, the description thereof will be omitted. The PBX 30 may not hold the storage unit 402. In this case, the function execution unit 401 may inquire the management device 20 about the contents of the telephone directory, if necessary.

The PSTN communication unit 403 has various functions (calling function, incoming call function, etc.) for connecting to the PSTN and making 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 a customer is called from the terminal 10 of the individual A by using the above-mentioned source number conversion function (function A). In the following description, it is assumed that the record shown in FIG. 3 is stored in the telephone directory stored in the storage unit 302 of the management device 20 and the storage unit 402 of the PBX 30.

In step S301, the UI unit 107 of the terminal 10a selects (or inputs) the customer's external line number (0457777777), instructs the individual A to use the above-mentioned source number conversion function (function A), and issues a message. Accepts the press of the call button.

In step S302, the request unit 103 of the terminal 10a transmits the prefix inquiry signal to the management device 20. The prefix inquiry signal includes an outside line number (0457777777) of a customer who is a call destination and information indicating a call source number conversion function (function A). The information indicating the source number conversion function (function A) may be an identifier or the like unique to each function, 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 mean that the prefix inquiry signal contains 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 a prefix to the outside line number of the transmission destination included in the prefix inquiry signal. Further, the notification unit 201 transmits a prefix inquiry response signal including the outside line number (804757777777) of the transmission destination to which the prefix is added to the terminal 10.

In step S305, the request unit 103 of the terminal 10 instructs the communication unit 101 to make a call using the outside line number (804757777777) of the destination to which the prefix is added. The communication unit 101 makes a call to the outside line number (804757777777) instructed by the request unit 103. The communication unit 101 includes its own extension number (61001) as the telephone number of the caller in the control signal related to the call. The control signal related to the call made from the terminal 10 is transmitted to the PBX 30 via each device (base station, exchange, and extension service providing device included 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 source 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 execution unit 401 identifies the user (individual A) having the extension number by searching the telephone directory using the extension number (61001) of the sender included in the received control signal as a key. do. Next, the function execution unit 401 identifies the organization (organization X) to which the specified user (individual A) belongs, and acquires an outside line number (0451111111) corresponding to the specified organization.

In step S308, the PSTN communication unit 403 of the PBX 30 sets a telephone number (0457777777) excluding the prefix "8" as the telephone number of the destination, and the external line number (0451111111) of the organization X as the telephone number of the caller. To make a call. As a result, the customer's telephone display the outside line number of the organization X instead of the outside line number of the terminal A as the caller.

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 included in the PBX 30 is notified from the management device 20 to the terminal 10. Therefore, when the user (individual A) uses the function of the PBX 30, the user (individual A) can operate the function of the PBX 30 without assigning a prefix to the destination telephone number and dialing. Further, the user (individual A) can operate the functions of the PBX 30 without knowing the prefix corresponding to each of the various functions of the PBX 30.

<Supplement to the embodiment>
Each embodiment can be combined arbitrarily. That is, the first embodiment and the second embodiment may be combined, the first embodiment and the third embodiment may be combined, or 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 be provided with 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, each functional unit of the terminal 10, the management device 20 and the PBX 30 according to each embodiment is processed by each of the management device 20 and the PBX 30 by using the hardware resources such as the CPU and the memory provided therein. It can be realized by executing the program corresponding to. Further, the program can be stored in a storage medium.

In each embodiment, the organization is an example of a "group". The extension number of the terminal 10 is an example of "information for identifying the 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 (3)

A communication system that has a terminal and a management device.
The management device is
A storage means for storing information associated with an external line number and an internal line number of one or more terminals, and a storage means.
When an extension number notification request is received from the terminal, an extension number corresponding to the outside line number included in the extension number notification request is acquired from the information, and a notification means for notifying the acquired extension number to the terminal.
Have,
The terminal is
A request means for transmitting an extension number notification request including only the outside line number of the destination received from the user to the management device, and
A communication means for making a call via a public mobile phone network using the extension number notified from the management device, and
A communication system. The terminal and the management device are connected to each other so as to be able to communicate with each other via the public mobile phone network.
The notification means is
When the extension number notification request is received from the terminal via the public mobile phone network, the extension number is acquired from the information and the acquired extension number is notified to the terminal via the public mobile phone network. death,
The requesting means
The extension number notification request is transmitted via the public mobile phone network, and the extension number notification request is transmitted.
The communication means is
The communication system according to claim 1, wherein a call is made from the management device using an extension number notified via the public mobile phone network. A communication method executed by a communication system having a terminal and a management device.
A step in which the management device stores information in which an external line number and an internal line number of one or more terminals are associated with each other in a storage means.
When the management device receives an extension number notification request from the terminal, the step of acquiring an extension number corresponding to the outside line number included in the extension number notification request from the information and notifying the terminal of the acquired extension number. When,
A step in which the terminal sends an extension number notification request including only the outside line number of the call destination received from the user to the management device, and
A step in which the terminal makes a call via a public mobile phone network using the extension number notified from the management device.
The communication method.

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