JP6852640B2 - Extension telephone system, main unit, radiotelephone terminal, computer-readable program, and communication method of extension telephone system - Google Patents

Description

The present invention relates to an extension telephone system using a wireless telephone terminal.

In recent years, an extension telephone system using a wireless telephone terminal such as a smartphone has been known (for example, Patent Document 1). Generally, in this type of extension telephone system, the radiotelephone terminal activates the extension telephone function by invoking a dedicated application program. Then, by this extension telephone function, the radiotelephone terminal enjoys the extension telephone service provided by the main unit by transmitting and receiving a call control message to and from the main unit via the access point.

Japanese Unexamined Patent Publication No. 2008-187224

However, the extension telephone system using the conventional radiotelephone terminal presupposes that the radiotelephone terminal belongs to the same network as the main unit via the access point. When the radiotelephone terminal moves out of the service area of the access point and leaves the same network as the main unit, the radiotelephone terminal cannot send and receive call control messages between the radiotelephone terminal and the main unit. Cannot enjoy the extension telephone service provided by.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an extension telephone service provided by the main unit regardless of whether or not the main unit and the radiotelephone terminal belong to the same network. The purpose is to provide technology that can be enjoyed by wireless telephone terminals.

In order to solve the above problems, in the present invention, the extension telephone service provided by the main unit can be enjoyed by the wireless telephone terminal by transmitting and receiving a call control message between the wireless telephone terminal and the main unit using push notification. I did.

For example, the extension telephone system of the present invention
An extension telephone system including a radiotelephone terminal and a main device accommodating the radiotelephone terminal.
The wireless telephone terminal is
A terminal-side call control message transmitting means for transmitting the call control message to the main device by transmitting a push notification request whose notification destination is the main device and whose notification content is a call control message to the push notification server.
A terminal-side call control message receiving means that receives a call control message from the main device by receiving a push notification from the push notification server with the notification source as the main device and the notification content as a call control message. Have,
The main device is
Receiving a main unit side call control message that receives the call control message from the radiotelephone terminal by receiving a push notification with the notification source as the radiotelephone terminal and the notification content as a call control message from the push notification server. Means and
A main unit side call control message that transmits the call control message to the radiotelephone terminal by transmitting a push notification request whose notification destination is the radiotelephone terminal and whose notification content is a call control message to the push notification server. It has a transmission means.

According to the present invention, since the call control message is transmitted and received between the radiotelephone terminal and the main unit by using the push notification, as long as the radiotelephone terminal and the main unit can communicate with the push notification server, the main unit and the radiotelephone Regardless of whether or not the terminal belongs to the same network, the extension telephone service provided by the main unit can be enjoyed by the wireless telephone terminal.

FIG. 1 is a schematic configuration diagram of an extension telephone system according to an embodiment of the present invention. FIG. 2 is a sequence diagram for explaining an operation example of the extension telephone system according to the embodiment of the present invention. FIG. 3 is a sequence diagram for explaining an operation example of the extension telephone system according to the embodiment of the present invention, and is a continuation of FIG. FIG. 4 is a schematic configuration diagram of the main device 1. FIG. 5 is a flow chart for explaining the operation of the main device 1. FIG. 6 is a schematic configuration diagram of the wireless telephone terminal 2. FIG. 7 is a flow chart for explaining the operation of the outgoing call processing of the wireless telephone terminal 2. FIG. 8 is a flow chart for explaining the operation of incoming call processing of the wireless telephone terminal 2. FIG. 9 is a flow chart for explaining the operation of the end-of-call processing of the wireless telephone terminal 2.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an extension telephone system according to the present embodiment.

As shown in the figure, the extension telephone system according to the present embodiment mainly accommodates a plurality of radiotelephone terminals 2-1 and 2-2 (hereinafter, also simply referred to as radiotelephone terminals 2) and the radiotelephone terminal 2. The device 1 and the push notification server 3 are provided.

The main device 1 is connected to a LAN (Local Area Network) 6, and the LAN 6 is connected to an IP (Internet Protocol) network 7 via a gateway 4. The radiotelephone terminal 2 is connected to a mobile phone network 8 that supports push notification services such as a 3G (3rd Generation) / LTE (Long Term Evolution) network via a base station 5, and the mobile phone network 8 is an IP. It is connected to the network 7. Further, the push notification server 3 is a server that provides a push notification service, and is connected to the IP network 7.

In the above configuration, the main device 1 and the wireless telephone terminal 2 use the push notification service provided by the push notification server 3 to send and receive call control messages to and from each other. As a result, the wireless telephone terminal 2 enjoys the extension telephone service provided by the main device 1.

2 and 3 are sequence diagrams for explaining an operation example of the extension telephone system according to the present embodiment.

First, it is assumed that the radiotelephone terminal 2-1 receives a transmission operation from the user accompanied by the designation of the number information of the radiotelephone terminal 2-2 (S100). In response to this, the radiotelephone terminal 2-1 makes a push notification request in which the main device 1 is the notification destination and the connection request message in which the number information of the radiotelephone terminal 2-2 is designated as the other party number is the notification content. It is transmitted to the push notification server 3 via the base station 5, the mobile phone network 8, and the IP network 7 (S101).

Next, when the push notification server 3 receives the push notification request from the wireless telephone terminal 2-1, the push notification server 3 sets the wireless telephone terminal 2-1 as the transmission source of the push notification request as the notification source, and the notification content of the push notification request. A push notification containing the connection request message as the notification content is transmitted to the main device 1 which is the notification destination of the push notification request received from the wireless telephone terminal 2-1 via the IP network 7, the gateway 4, and the LAN 6. (S102).

In response to this, the main device 1 uses the wireless telephone terminal 2-2 specified by the partner number specified in the connection request message, which is the notification content of the push notification received from the push notification server 3, as the notification destination. A push notification request containing a connection request message as a notification content is transmitted to the push notification server 3 via the LAN 6, the gateway 4, and the IP network 7 (S103).

Next, when the push notification server 3 receives the push notification request from the main device 1, the main device 1 which is the transmission source of the push notification request is set as the notification source, and the connection request message which is the notification content of the push notification request is transmitted. The push notification as the notification content is transmitted to the wireless telephone terminal 2-2, which is the notification destination of the push notification request received from the main unit 1, via the IP network 7, the mobile phone network 8, and the base station 5 (S104). ).

In response to this, the wireless telephone terminal 2-2 executes an incoming call notification by ringing an incoming call or the like to notify the user that there is an incoming call (S105). When the radiotelephone terminal 2-2 receives a response operation from the user (S106), the main device 1 is set as the notification destination, and the connection response message in which the number information of the radiotelephone terminal 2-1 is designated as the other party number is set as the notification content. The push notification request to be made is transmitted to the push notification server 3 via the base station 5, the mobile phone network 8, and the IP network 7 (S107).

Next, when the push notification server 3 receives the push notification request from the wireless telephone terminal 2-2, the push notification server 3 sets the wireless telephone terminal 2-2, which is the source of the push notification request, as the notification source, and the notification content of the push notification request. A push notification containing the connection response message as the notification content is transmitted to the main device 1 which is the notification destination of the push notification request received from the wireless telephone terminal 2-2 via the IP network 7, the gateway 4, and the LAN 6. (S108).

In response to this, the main device 1 sets the notification destination to the radiotelephone terminal 2-1 specified by the partner number specified in the connection response message, which is the notification content of the push notification received from the push notification server 3. A push notification request containing a connection response message as a notification content is transmitted to the push notification server 3 via the LAN 6, the gateway 4, and the IP network 7 (S109).

Next, when the push notification server 3 receives the push notification request from the main device 1, the main device 1 which is the transmission source of the push notification request is set as the notification source, and the connection response message which is the notification content of the push notification request is transmitted. The push notification as the notification content is transmitted to the wireless telephone terminal 2-1 which is the notification destination of the push notification request received from the main unit 1 via the IP network 7, the mobile phone network 8, and the base station 5 (S110). ).

As described above, a call path (VoIP call path or VoLTE call path) is established between the wireless telephone terminal 2-1 and the wireless telephone terminal 2-2 via the main device 1, and the main device 1 uses this call path. The voice call or the video voice call is relayed via (S111).

Next, it is assumed that the wireless telephone terminal 2-1 has received the disconnection operation from the user (S112). In response to this, the radiotelephone terminal 2-1 makes a push notification request in which the main device 1 is the notification destination and the disconnection request message in which the number information of the radiotelephone terminal 2-2 is designated as the other party number is the notification content. It is transmitted to the push notification server 3 via the base station 5, the mobile phone network 8, and the IP network 7 (S113).

Next, when the push notification server 3 receives the push notification request from the wireless telephone terminal 2-1, the push notification server 3 sets the wireless telephone terminal 2-1 as the transmission source of the push notification request as the notification source, and the notification content of the push notification request. A push notification containing the disconnection request message as the notification content is transmitted to the main device 1 which is the notification destination of the push notification request received from the wireless telephone terminal 2-1 via the IP network 7, the gateway 4, and the LAN 6. (S114).

In response to this, the main device 1 uses the radiotelephone terminal 2-2 specified by the other party number specified in the disconnection request message, which is the notification content of the push notification received from the push notification server 3, as the notification destination. A push notification request containing a disconnection request message as a notification content is transmitted to the push notification server 3 via the LAN 6, the gateway 4, and the IP network 7 (S115).

Next, when the push notification server 3 receives the push notification request from the main device 1, the main device 1 which is the transmission source of the push notification request is set as the notification source, and the disconnection request message which is the notification content of the push notification request is transmitted. The push notification as the notification content is transmitted to the wireless telephone terminal 2-2, which is the notification destination of the push notification request received from the main unit 1, via the IP network 7, the mobile phone network 8, and the base station 5 (S116). ).

In response to this, the radiotelephone terminal 2-2 makes a push notification request in which the main device 1 is the notification destination and the disconnection response message in which the number information of the radiotelephone terminal 2-1 is designated as the other party number is the notification content. It is transmitted to the push notification server 3 via the base station 5, the mobile phone network 8, and the IP network 7 (S117).

Next, when the push notification server 3 receives the push notification request from the wireless telephone terminal 2-2, the push notification server 3 sets the wireless telephone terminal 2-2, which is the source of the push notification request, as the notification source, and the notification content of the push notification request. A push notification containing the disconnection response message as the notification content is transmitted to the main device 1 which is the notification destination of the push notification request received from the wireless telephone terminal 2-2 via the IP network 7, the gateway 4, and the LAN 6. (S118).

In response to this, the main device 1 sets the notification destination to the radiotelephone terminal 2-1 specified by the other party number specified in the disconnection response message, which is the notification content of the push notification received from the push notification server 3. A push notification request containing a disconnection response message as a notification content is transmitted to the push notification server 3 via the LAN 6, the gateway 4, and the IP network 7 (S119).

Next, when the push notification server 3 receives the push notification request from the main device 1, the main device 1 which is the transmission source of the push notification request is set as the notification source, and the disconnection response message which is the notification content of the push notification request is transmitted. The push notification as the notification content is transmitted to the wireless telephone terminal 2-1 which is the notification destination of the push notification request received from the main device 1 via the IP network 7, the mobile phone network 8, and the base station 5 (S120). ).

As a result, the communication path established between the wireless telephone terminal 2-1 and the wireless telephone terminal 2-2 is released via the main device 1 (S121).

Next, the details of the main device 1 and the wireless telephone terminal 2 constituting the extension telephone system according to the present embodiment will be described. Since an existing server can be used for the push notification server 3, detailed description thereof will be omitted.

First, the main device 1 will be described.

FIG. 4 is a schematic configuration diagram of the main device 1.

As shown in the figure, the main device 1 includes a communication interface unit 10, a push notification processing unit 11, and a main device function unit 12.

The communication interface unit 10 is an interface for communicating with other communication devices including the wireless telephone terminal 2 and the push notification server 3 via the LAN 6.

The push notification processing unit 11 transmits a push notification request to the push notification server 3 and receives a push notification from the push notification server 3.

The main unit function unit 12 performs necessary processing as a main unit that provides an extension telephone service to the wireless telephone terminal 2. Specifically, by transmitting and receiving a call control message to and from the radiotelephone terminal 2 via the push notification processing unit 11 in accordance with a predetermined call control protocol such as SIP (Session Initiation Protocol), a call path between the radiotelephone terminals 2 is transmitted and received. Or release an established call path. Further, according to a predetermined transmission protocol such as RTP (Realtime Transport Protocol), a voice call or a video voice call between radiotelephone terminals 2 is relayed via a communication path.

FIG. 5 is a flow chart for explaining the operation of the main device 1.

When the push notification processing unit 11 receives the push notification from the push notification server 3 via the communication interface unit 10 (YES in S200), the push notification processing unit 11 extracts the call control message which is the notification content from the push notification (S201). Then, the extracted call control message is passed to the main device function unit 12.

In response to this, the main device function unit 12 processes the call control message received from the push notification processing unit 11 according to a predetermined call control protocol (S202). Then, the call control message for the wireless telephone terminal 2 specified by the remote party number specified in the call control message is passed to the push notification processing unit 11 together with the remote party number.

Next, when the push notification processing unit 11 receives the call control message and the remote party number from the main device function unit 12, the wireless telephone terminal 2 specified by the remote party number is set as the notification destination, and this call control message is set as the notification content. Generate a push notification request. Then, this push notification request is transmitted to the push notification server 3 via the communication interface unit 10 (S203).

When the main unit function unit 12 receives the call data from the radiotelephone terminal 2 via the communication interface unit 10 (YES in S204), the main unit function unit 12 establishes a communication path with the radiotelephone terminal 2 according to a predetermined transmission protocol. Identify the established radiotelephone terminal 2 of the other party. Then, the call data is relayed to the wireless telephone terminal 2 of the other party via the communication interface unit 10 (S205).

Next, the wireless telephone terminal 2 will be described.

FIG. 6 is a schematic configuration diagram of the wireless telephone terminal 2.

As shown in the figure, the wireless telephone terminal 2 includes a wireless communication interface unit 20, a man-machine interface unit 21, a push notification processing unit 22, and an extension telephone function unit 23.

The wireless communication interface unit 20 is an interface for communicating with the main device 1, another wireless telephone terminal 2, and the push notification server 3 via the base station 5 and the mobile phone network 8.

The man-machine interface unit 21 is an interface for presenting information to the user, accepting input of information from the user, and making a phone call by the user, and includes an input device such as a touch panel and a display device such as a liquid crystal display. It has an audio input / output device such as a handset.

The push notification processing unit 22 sends a push notification request to the push notification server 3 and receives a push notification from the push notification server 3.

The extension telephone function unit 23 carries out processing necessary for enjoying the extension telephone service provided by the main device 1. Specifically, a call path is established between the other wireless telephone terminal 2 by transmitting and receiving a call control message to and from the main device 1 via the push notification processing unit 22 in accordance with a predetermined call control protocol such as SIP. Or release an established call path. Further, according to a predetermined transmission protocol such as RTP, a voice call or a television voice call is carried out with another wireless telephone terminal 2 via an established communication path.

FIG. 7 is a flow chart for explaining the operation of the outgoing call processing of the wireless telephone terminal 2.

This flow is started when the human-machine interface unit 21 receives from the user a transmission operation accompanied by designation of the other party number (call destination number).

First, the man-machine interface unit 21 notifies the extension telephone function unit 23 of the outgoing call operation received from the user. The extension telephone function unit 23 generates a connection request message with the designation of the other party number received in the outgoing call operation (S300). Then, this connection request message is passed to the push notification processing unit 22. In response to this, the push notification processing unit 22 generates a push notification request with the main device 1 as the notification destination and the connection request message as the notification content, and sends the push notification server 3 to the push notification server 3 via the wireless communication interface unit 20. , Send this push notification request (S301).

Next, when the push notification processing unit 22 receives the push notification from the push notification server 3 via the wireless communication interface unit 20 (YES in S302), the push notification processing unit 22 extracts the call control message which is the notification content from the push notification (YES in S302). S303). Then, the extracted call control message is passed to the extension telephone function unit 23.

When the call control message received from the push notification processing unit 22 is a connection response message (YES in S304), the extension telephone function unit 23 establishes a communication path with the destination radiotelephone terminal 2 via the main unit 1. Since it has been established, a call is started using this communication path (S305). On the other hand, when the call control message is a call control message other than the connection response message such as a busy message (NO in S304), the call control message processing according to the content of the call control message is executed (S306).

FIG. 8 is a flow chart for explaining the operation of incoming call processing of the wireless telephone terminal 2.

This flow is started when the push notification processing unit 22 receives a push notification having a connection request message as the notification content from the push notification server 3 via the wireless communication interface unit 20.

First, the push notification processing unit 22 extracts the connection request message, which is the content of the notification, from the received push notification and passes it to the extension telephone function unit 23. In response to this, the extension telephone function unit 23 outputs an incoming call notification to the man-machine interface unit 21 by ringing an incoming call or the like (S310).

Next, when the man-machine interface unit 21 receives a response operation from the user (YES in S311), the man-machine interface unit 21 notifies the extension telephone function unit 23 of this. In response to this, the extension telephone function unit 23 generates a connection response message (S312) and passes the connection response message to the push notification processing unit 22. Then, the push notification processing unit 22 generates a push notification request with the main device 1 as the notification destination and the connection response message as the notification content. Then, the push notification processing unit 22 transmits this push notification request to the push notification server 3 via the wireless communication interface unit 20 (S313). As a result, a telephone path is established with the wireless telephone terminal 2 that is the source of the connection request message via the main device 1, and the extension telephone function unit 23 starts a call using this telephone path (S314).

FIG. 9 is a flow chart for explaining the operation of the end-of-call processing of the wireless telephone terminal 2.

In this flow, the man-machine interface unit 21 accepts a disconnection operation from the user while the call path is being established, or the push notification processing unit 22 sends a disconnection request message from the push notification server 3 via the wireless communication interface unit 20. It is started by receiving the push notification as the notification content.

First, the extension telephone function unit 23 proceeds to S321 when the man-machine interface unit 21 receives the disconnection operation and the man-machine interface unit 21 notifies the disconnection operation (disconnection operation in S320). On the other hand, when the push notification processing unit 22 receives the push notification whose notification content is the disconnection request message, and the extension telephone function unit 23 receives the disconnection request message from the push notification processing unit 22 (disconnection request message in S320). , S326.

In S321, the extension telephone function unit 23 generates a disconnection request message accompanied by the designation of the other party number, which is the number information of the other wireless telephone terminal 2 connected via the telephone path, and pushes the disconnection request message. Hand over to department 22. In response to this, the push notification processing unit 22 generates a push notification request with the main device 1 as the notification destination and the disconnection request message as the notification content, and sends the push notification server 3 to the push notification server 3 via the wireless communication interface unit 20. , Send this push notification request (S322).

Next, when the push notification processing unit 22 receives the push notification from the push notification server 3 via the wireless communication interface unit 20 (YES in S323), the push notification processing unit 22 extracts the call control message which is the notification content from the push notification. The extracted call control message is passed to the extension telephone function unit 23. In response to this, the extension telephone function unit 23 confirms that the call control message received from the push notification processing unit 22 is a disconnection response message (S324). As a result, the extension telephone function unit 23 recognizes that the call path has been released and ends the call (S325).

On the other hand, in S326, the extension telephone function unit 23 generates a disconnection response message and passes the disconnection response message to the push notification processing unit 22. In response to this, the push notification processing unit 22 generates a push notification request with the main device 1 as the notification destination and the disconnection response message as the notification content, and sends the push notification server 3 to the push notification server 3 via the wireless communication interface unit 20. , Send this push notification request (S327). As a result, the extension telephone function unit 23 recognizes that the call path has been released and ends the call (S325).

The embodiment of the present invention has been described above.

According to the present embodiment, since the call control message is transmitted and received between the main unit 1 and the radiotelephone terminal 2 using the push notification, the main unit 1 and the radiotelephone terminal 2 communicate with the push notification server 3. As long as possible, the radiotelephone terminal 2 can enjoy the extension telephone service provided by the main unit 1 regardless of whether the main unit 1 and the radiotelephone terminal 2 belong to the same network.

The present invention is not limited to the above-described embodiment, and many modifications can be made within the scope of the gist thereof.

For example, in the above embodiment, the functional configuration of the main device 1 shown in FIG. 4 may be realized by an integrated logic IC such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). It may be realized by software by a computer such as a DSP (Digital Signal Processor). Alternatively, in a general-purpose computer of a PC (Personal Computer) equipped with an auxiliary storage device such as a CPU, a memory, and an HDD, and a communication interface such as a NIC (Network Interface Card), the CPU transfers a predetermined program from the auxiliary storage device to the memory. It may be realized by loading and executing. Further, the functional configuration of the radiotelephone terminal 2 shown in FIG. 6 may be realized in hardware by an integrated logic IC such as an ASIC or FPGA, or software by a computer such as a DSP, as in the main device 1. It may be realized as a target. Alternatively, in a portable general-purpose computer such as a smartphone or tablet terminal equipped with an auxiliary storage device such as a CPU, memory, or flash memory, and a communication interface such as a wireless adapter, the CPU transfers a predetermined program from the auxiliary storage device to the memory. It may be realized by loading and executing.

Further, in the above embodiment, the wireless telephone terminal 2 may belong to the same LAN 6 as the main device 1 or another LAN (not shown).

Further, when the main device 1 receives a call control message such as a connection request message, if the radiotelephone terminal 2 having the other party number specified in the call control message is separated from the same network as the main device 1, the main device 1 can be used. A push notification with the radiotelephone terminal 2 as the notification destination may be transmitted to the push notification server 3.

Further, in the above embodiment, the notification content of the push notification request includes a connection request message or the like in which the number information of one radiotelephone terminal 2 is designated as the other party number, but a plurality of radiotelephones A multi-party call may be realized by using the number information of the terminal 2 as the other party number and the connection request message or the like as the notification content of the push notification request.

1: Main unit 2,2-1,2-2: Wireless telephone terminal 3: Push notification server 4: Gateway 5: Base station 6: LAN 7: IP network 8: Mobile phone network 10: Communication interface unit 11: Push notification Processing unit 12: Main device function unit 20: Wireless communication interface unit 21: Man-machine interface unit 22: Push notification processing unit 23: Extension telephone function unit

Claims (6)

An extension telephone system including a radiotelephone terminal and a main device accommodating the radiotelephone terminal.
The wireless telephone terminal is
A terminal-side call control message transmitting means for transmitting the call control message to the main device by transmitting a push notification request whose notification destination is the main device and whose notification content is a call control message to the push notification server.
A terminal-side call control message receiving means that receives a call control message from the main device by receiving a push notification from the push notification server with the notification source as the main device and the notification content as a call control message. Have,
The main device is
Receiving a main unit side call control message that receives the call control message from the radiotelephone terminal by receiving a push notification with the notification source as the radiotelephone terminal and the notification content as a call control message from the push notification server. Means and
A main unit side call control message that transmits the call control message to the radiotelephone terminal by transmitting a push notification request whose notification destination is the radiotelephone terminal and whose notification content is a call control message to the push notification server. An extension telephone system characterized by having a means of transmission. A radiotelephone terminal equipped with an extension telephone function that enjoys the extension telephone service provided by the main unit.
A terminal-side call control message transmitting means for transmitting the call control message to the main device by transmitting a push notification request whose notification destination is the main device and whose notification content is a call control message to the push notification server.
A terminal-side call control message receiving means that receives a call control message from the main device by receiving a push notification from the push notification server with the notification source as the main device and the notification content as a call control message. A radiotelephone terminal characterized by having. It is the main device that provides extension telephone services to wireless telephone terminals.
A main unit side call control message receiving means for receiving a call control message from the radiotelephone terminal by receiving a push notification from the push notification server with the notification source as the radiotelephone terminal and the notification content as a call control message. When,
A main unit side call control message that transmits the call control message to the radiotelephone terminal by transmitting a push notification request whose notification destination is the radiotelephone terminal and whose notification content is a call control message to the push notification server. A main device characterized by having a transmission means. A computer-readable program
The program
The computer is made to function as a radiotelephone terminal having an extension telephone function for enjoying the extension telephone service provided by the main unit.
The wireless telephone terminal is
A terminal-side call control message transmitting means for transmitting the call control message to the main device by transmitting a push notification request whose notification destination is the main device and whose notification content is a call control message to the push notification server.
A terminal-side call control message receiving means that receives a call control message from the main device by receiving a push notification from the push notification server with the notification source as the main device and the notification content as a call control message. A computer-readable program characterized by having. A computer-readable program
The program
The computer is made to function as a main device for providing an extension telephone service to a wireless telephone terminal.
The main device is
A main unit side call control message receiving means for receiving a call control message from the radiotelephone terminal by receiving a push notification from the push notification server with the notification source as the radiotelephone terminal and the notification content as a call control message. When,
A main unit side call control message that transmits the call control message to the radiotelephone terminal by transmitting a push notification request whose notification destination is the radiotelephone terminal and whose notification content is a call control message to the push notification server. A computer-readable program characterized by having a means of transmission. A communication method for an extension telephone system including a radiotelephone terminal and a main device accommodating the radiotelephone terminal.
The wireless telephone terminal is
By sending a push notification request whose notification destination is the main device and whose notification content is a call control message to the push notification server, the call control message is transmitted to the main device and the notification source is the main device. By receiving the push notification whose notification content is the call control message from the push notification server, the call control message is received from the main device.
The main device is
By receiving a push notification whose notification source is the radiotelephone terminal and whose notification content is a call control message from the push notification server, the call control message is received from the radiotelephone terminal and the notification destination is the radiotelephone. A communication method of an extension telephone system, characterized in that a call control message is transmitted to the radiotelephone terminal by transmitting a push notification request having the notification content as a call control message as a telephone terminal. ..

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