JP4124781B2 - EXTENSION TELEPHONE SYSTEM, TERMINAL DEVICE, EXTENSION DEVICE, AND EXTENSION TELEPHONE METHOD - Google Patents

Description

  The present invention relates to an extension telephone system, a terminal device, an extension device, and an extension telephone method for implementing a virtual extension service by a terminal device such as a fixed telephone and a mobile phone terminal on a public line network.

  Conventionally, extension telephones using general PBX / IP-PBX, etc. have become more multifunctional. In addition to general functions such as call forwarding and connection exchange, for example, multiple extension terminals are grouped and grouped in groups. Functions such as call forwarding and connection exchange are also implemented.

  In this extension service on a group basis, the function to display the status of the intra-group line can be added to the external line button arranged on the operation panel of the extension terminal, or displayed by the color or blinking of the LED lamp of each button. It is common. In addition, in the extension function, the call transfer and hold function operations are often performed by pressing a dedicated button, and the pickup operation in the hold state is an operation of selecting and pressing a button corresponding to the line. There are many methods.

  On the other hand, in recent years, a so-called virtual extension service (VPN) in which a fixed telephone terminal, a mobile phone terminal, or a PHS terminal is an extension terminal using a public telephone network has been started (for example, Patent Document 1). reference). In this virtual extension service, an extension group is constructed using a line of a general landline telephone or a mobile phone terminal, and outgoing / incoming calls using extension numbers within the group are made possible.

Generally, in a virtual extension service in a public network, an IN (Intelligent Network) device is arranged on the network, and the public line telephone number assigned globally to a fixed telephone terminal or a mobile phone terminal by this IN device. By connecting the extension number in the extension group and dialing the extension number, exchange connection is performed by using the public line telephone number, and it is possible to talk with other terminals in the group. Accordingly, a general-purpose mobile phone terminal that does not have an extension function can be used like an extension phone.
JP 2005-57320 A

  However, in the above-described conventional virtual extension service, the control signal for holding or picking up is generally transmitted and received using a call protocol, so the amount of data that can be transmitted and received by the control signal There is a problem that it is not possible to transmit and receive high-level control signals between the terminal and the IN device.

  For this reason, for example, the function of sending and receiving the line status within the group between the terminal and the IN device and displaying it on each terminal, the function of another terminal picking up a call held by another terminal, etc. It is difficult to realize functions generally implemented in extension telephones.

  Therefore, the present invention has been made in view of the above points, and an extension telephone system and a terminal device capable of realizing more advanced functions when a virtual extension service is performed by a fixed telephone or a mobile phone terminal on a public line network. It is an object of the present invention to provide an extension device and an extension telephone method.

  In order to solve the above problems, the present invention provides a terminal device provided with an extension telephone number and provided with voice communication means for performing voice communication, a telephone number of a public telephone line connected to the extension device, and a terminal device. An associated extension number is stored in association with each other, and a voice call through the public line switching network is switched and connected to the terminal apparatus based on the telephone number and extension number of the public telephone line. An extension device that exchanges and connects a voice call made and received through a circuit switching network and a voice call between terminal devices is used.

In the present invention, the extension device searches for a free line from the public line by receiving an incoming call from a call partner on the public line switching network , and uses the searched free line for communication between the terminal device and the call partner. The assigned free line is set as a voice call for making a call by the terminal device, and the extension device performs data transmission using a communication protocol independent of a communication protocol for switching and connecting the voice call. In response to a display information request from the terminal device and a data communication means for performing communication, display information for displaying the exchange connection state in the extension device is generated, and the terminal device via the data communication is generated The display information transmission unit to be transmitted and the telephone number of the public telephone line that is connected to the extension device by an incoming call from the public line network and is in a call due to voice call setting A line management database that associates and stores the extension number assigned to the terminal device to which the voice call has been set, and a voice call through the public line switching network, and the telephone number and extension number of the public telephone line And a switching control unit that receives the control signal transmitted from the terminal device and switches the switching connection in accordance with the control signal.

In this invention,
(1) Upon receiving an incoming call from a call partner on the public line network , a free line is searched from among the public lines, the searched free line is assigned to communication between the terminal device and the call partner, and the searched free line Makes a voice call setting that the terminal device is in a call, and exchanges and connects the call to the terminal device based on the telephone number and extension number of the public telephone line, and the extension to the terminal device. The telephone number of the public telephone line that has been set for voice call and is in a call and the extension number assigned to the terminal apparatus for which the voice call setting has been made are associated and stored in the line management database. Then, an application executed on the terminal device is activated by an incoming call from the extension device, and the display information request corresponding to the voice call setting is sent from the application to the extension device. Te, the communication protocol for exchanging connecting the voice call transmitted by data communication by separately independent communication protocol,
(2) Display information was received and received in parallel with the voice call by the voice communication means through the data communication means for performing data communication by a communication protocol independent of the communication protocol for exchanging and connecting the voice call. Display the display information and send control signals to the extension device,
(3) The control signal transmitted from the terminal device via the data communication is received by the extension device by the activated application, and the exchange connection is switched according to the control signal.

  According to the present invention, since voice communication and data communication are transmitted and received by separate communication protocols, a control signal having a large data size can be transmitted and received, and a more complicated extension operation can be realized. In addition, since the voice communication and the data communication are made independent, the display information received via the data communication can be displayed while the voice communication is maintained, and the user performs an operation based on the display information. The control signal by the user's operation can be transmitted to the network while maintaining the voice communication.

In the above invention, the extension function control unit is an application executed on the terminal device, and the application is activated by a call to the extension device or an incoming call from the extension device, and a call is started by the voice call setting. Since the display information request relating to the intra-group line status is transmitted to the extension device, an extension function can be easily added to a general terminal device by introducing an application.

  And in this case, when it becomes a situation that requires an extension operation, the extension function can be automatically executed without waiting for the user's special operation, and the user operation can be saved. The above-described extension function can be activated only in a state where communication with the extension device is possible, and it is possible to avoid the extension function from being executed wastefully in a situation where the extension function is unnecessary.

  In the above invention, the process related to the exchange connection preferably includes a process of placing the call on hold, calling another terminal device, and executing a call exchange connection according to a response from the other terminal device. In this case, by sending and receiving a control signal with a large data size, complicated processing such as calling of another terminal device, exchange connection, pickup by another terminal device, line disconnection, etc. is executed according to a user operation. Can be made. As for the exchange connection to other terminal devices, for example, a plurality of terminal devices may be grouped, and exchange connection or calling may be executed only for the terminal devices belonging to this group.

  In the above invention, the extension device is provided with a voice mail function for recording and reproducing voices, and for processing related to the exchange connection, a call to the terminal device is connected to the voice mail function according to a control signal from the terminal device. In addition, it may include a process of recording the voice of the other party or reproducing the message stored in the answering function. In this case, by sending and receiving a control signal with a large data size, more complicated settings and processing such as voice mail recording and answering message reproduction can be performed by operations on the terminal device.

  As described above, according to the present invention, it becomes possible to transmit and receive a control signal with a larger amount of information between the extension device and the terminal device that construct the extension telephone system, Advanced settings and processing can be executed, and more advanced functions can be realized when a virtual extension service is performed by a fixed telephone or a mobile phone terminal on a public line network.

(Configuration of extension telephone system)
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the extension telephone system according to the present embodiment. The “module” used in the description refers to a functional unit that is configured by hardware such as an apparatus or a device, software having the function, or a combination thereof, and achieves a predetermined operation. .

  As shown in the figure, the extension telephone system according to the present embodiment is constructed from an extension device 1 connected to the public line switching network 3 and a plurality of terminal devices 2a and 2b that are exchanged by the extension device 1. Is done.

  The terminal devices 2a and 2b are terminal devices that are provided with extension telephone numbers and are equipped with voice communication means for performing other telephone voice communications through the public circuit switched network 3 or IP network. Examples include terminals, wireless LAN telephone terminals, and mobile telephone terminals with a wireless LAN function.

  Extension device 1 is a function of transmitting and receiving control signals for extension exchange via data communication, in addition to the function of a general extension exchange that exchanges and connects communications for representative telephone numbers to terminal devices that are extension phones. It is a PBX / IP-PBX equipped with or an IN device that provides a virtual extension service. Specifically, the extension device 1 includes, as modules for extension exchange, a public line connection unit 11, a connection control unit 12, a line management database unit 17, a voice communication unit 16, and a hard disk for storing data. 18 and.

  The public line connection unit 11 is an interface for connecting to the public line switching network 3 and enables outgoing / incoming calls on the external line via the public line. The public line connection unit 11 may be provided with a so-called VoIP function that mutually converts a voice signal and a packet signal and transmits / receives the voice signal as an IP packet.

  The line management database unit 17 is a database device that stores table data that stores the public line telephone number of the terminal device 2a and the like and the extension number assigned to the terminal device 2a and the like in association with each other. This table data includes the extension number for each terminal device, public line (external line) identifiers (Line1 to 4), status (current communication status (calling, holding, calling, disconnected)), user name And additional information such as a group to which the user belongs are recorded.

The line management database unit 17 is a database device that stores table data that stores the public line telephone number of the terminal device 2a and the like and the extension number assigned to the terminal device 2a and the like in association with each other. The table data includes the extension number and public telephone number (external line number) for each terminal device, the line (Line 1 to 4) assigned when a call is in progress, the status (current communication status (busy, on hold) Other information such as a user name and a group to which the user belongs are recorded.

  The voice communication unit 16 is an interface for establishing a voice communication transmission path between the extension device and the terminal device 2a or 2b, and corresponds to a metallic communication line in the case of a general PBX, -In the case of PBX, it is compatible with VoIP over Ethernet (registered trademark), wireless LAN, etc., and if it is a virtual extension service (VPN) using a public network, it is a public line or a mobile phone line switching network It is a module corresponding to.

  The connection control unit 12 is a module that controls the voice call between the terminal devices and the exchange connection of the voice call that the terminal device makes and receives through the public network.

  In a call originated from the terminal device, the connection control unit 12 acquires the caller's dial number, analyzes it, and designates the called party indicated by the dial number. When the destination is a terminal accommodated in the same extension device, the destination terminal device is called to set a call. When the called party is a partner to be connected via a public line, the public line connection unit is controlled to start public line transmission processing.

  In addition, when an incoming call from a public line is received via a public line connection unit, the call destination is selected based on information such as the incoming line and the incoming telephone number and the terminal device settings. Perform processing.

  Further, the connection control unit 12 has a function of managing extension exchange connection in units of groups composed of a plurality of terminal devices. Specifically, based on the additional information recorded in the table data, it is managed which terminal device belongs to each group, and provision of a call pickup function for incoming calls and calls on hold is provided in a predetermined manner. Can only be executed within a group.

  The connection control unit 12 uses extension number data set in the terminal device, data specifying the connection destination for each dial number, data such as the destination of incoming calls from the public line, and group setting data, The connection control unit 12 stores the data in the line management database unit 17, acquires data from the line management database unit 17 as necessary, and performs various processes.

  In the present embodiment, the connection control unit 12 sets the voice transmission path with the terminal device that has activated the pickup in accordance with an operation from the user who activates the hold and places the call on hold. To do. In addition, the switch unit 19 is controlled to perform processing for instructing transmission of a tone signal to a call partner in a call on hold or ringing, and exchange connection of a call path at the time of switching.

  Also, in this exchange connection processing, in response to a control signal from the terminal device 2a etc., the call to the terminal device 2a etc. is connected to the answering function, and the voice of the other party is recorded or stored in the hard disk 18 Processing for executing message reproduction may be included.

  The switch unit 19 is a device that enables a voice call by setting a call path between voice transmission paths set between the terminal device and the extension device or between the voice transmission path and the public telephone line in the previous period. is there. In addition, the call path can be connected to the hard disk 18 to play a hold sound such as a melody, a user's recorded message, or a call when the communication is put on hold. Provides a function to record the other party's voice as voice mail.

  Further, the connection control unit 12 includes a display information transmission unit 14 for transmitting display information for displaying the exchange connection state in the extension device 1 as a module for extension exchange control, and a control transmitted from the terminal device 2a and the like. A control signal receiving unit 13 for receiving signals is connected. The display information is the status of the intra-group line generated with data in a format that can display images, such as HTML, and constitutes an operation screen for controlling the internal line, the telephone number of the other party of the call, It is also possible to display information such as the recorded time.

  The control signal receiving unit 13 and the display information generating unit transmit and receive data through the data communication unit 15. The data communication unit 15 is an interface for performing data communication using a communication protocol that is independent of the communication protocol for exchanging and connecting the voice call in the voice communication unit 16, and is displayed in parallel with the voice call by the voice communication unit 16. Information can be transmitted and a control signal for the extension device 1 can be received.

  Next, the internal configuration of the terminal device 2a or 2b will be described. FIG. 2 is a block diagram showing an internal configuration of the terminal device.

  First, the terminal devices 2a and 2b include a control unit 23 as an arithmetic processing device such as a CPU, and a memory 20 that is a storage device is connected to the control unit 23. Various applications (programs) and data are stored in the memory 20, and are read by the control unit 23 as necessary.

  Further, the terminal devices 2a and 2b include a voice communication bearer 21, a voice communication protocol control unit 22, a voice communication application 23a, a call middleware 23d, and a call unit such as a speaker or a microphone as a voice communication system module. 27 and.

  The voice communication bearer 21 is an interface that transmits and receives voice signals, VoIP IP packets, and the like, and the transmission and reception follow a communication protocol controlled by the voice communication protocol control unit 22. The call unit 27 is an interface that mutually converts voice and a voice signal that is an electrical signal, acquires the voice with a microphone, and outputs the voice with a speaker. The voice input / output by the call unit 27 is controlled by the call middleware 23d. The voice communication protocol control unit 22 and the call middleware 23d are executed on the control unit 23, and the operation is controlled by the voice communication application 23a that is also executed on the control unit 23.

  Further, the terminal devices 2a and 2b are, as data communication modules, a data communication bearer 24, a data communication protocol control unit 25, a data communication application 23c, an input middleware 23e, a display middleware 23f, an operation A unit 28 and a display unit 29 are provided.

  The data communication bearer 24 is an interface that transmits and receives IP packets for data communication, and transmits and receives packets in each communication medium (wireless LAN, XDSL, and optical communication). Follow the controlled communication protocol. The operation unit 28 is a user interface such as a numeric keypad, a button, or a jog dial, and converts a user operation into a control signal that is an electric signal. The display unit 29 is a display device such as a liquid crystal display. Input / output of data by the operation unit 28 and the display unit 29 is controlled by the input middleware 23e and the display middleware 23f. The data communication protocol control unit 25 and the input / display middlewares 23e and 23f are executed on the control unit 23, which is a CPU, and the operation is controlled by the data communication application 23c that is also executed on the control unit 23. . The data communication application 23c acquires display data such as HTML via the data communication bearer 24, analyzes the generated data to generate image data to be displayed, and displays the display unit 29 via the display middleware. To display.

  Further, in the control unit 23, the extension function dedicated application 23b is activated and executed. Note that the application executed by the control unit 23 can be realized by a combination of an application for voice communication and an application for general data communication. An extension function-dedicated application is used instead of the extension application.

  This extension function dedicated application has the same functions as general-purpose data communication applications in terms of analysis and display control of display data such as HTML, and conversion and transmission of user operations into electrical signals. A function for automatically starting an application at the time of outgoing / incoming calls, and a function for automating a data communication destination setting and authentication procedure are added.

  Specifically, the extension function dedicated application 23b receives display information from the extension device 1 through the data communication module in parallel with the voice call by the voice communication module, and causes the display unit 29 to display the display information. At the same time, a control signal for the extension device from the operation unit 28 is transmitted. The extension function-dedicated application 23b is automatically activated when the terminal devices 2a and 2b are located in an area where communication with the extension device 1 is possible and there is a call to the extension device 1 or an incoming call from the extension device 1. Is activated automatically.

(Extension phone method)
By operating the extension telephone system having the above configuration, the extension telephone method of the present invention can be implemented. FIG. 3 is a sequence diagram showing the operation of the extension telephone system according to the present embodiment.

  First, an incoming call is received from the other party on the outside line (public line switching network 3), or a voice call is set by calling from one of the terminal devices (here, the terminal device 2a), and the call is made via the extension device 1. Started (S101). At this time, the extension device 1 searches for an available line from Line 1 to Line 4 for voice call setting, assigns the available line (here, Line 2) to communication between the terminal device 2a and the other party, Line 2 Updates the line management database unit 17 to the status that the terminal device 2a is talking.

  When starting a call via the extension device 1, the extension function dedicated application 23b is activated (S102), and the extension function dedicated application 23b requests the extension device to display information related to the intra-group line status (S103). . In response to this, the extension device 1 generates display information by the display information transmission unit 14 and transmits it to the terminal device 2a, and the terminal device 2a displays the transmitted display information on the display unit 29. (S104 and S105).

  Next, the user of the terminal device 2a performs a hold operation so as to hold the call (S106). Specifically, as shown in FIG. 4A, according to the display information displayed on the display unit 29, “hold” is clicked. As a result, a hold instruction control signal is transmitted to the extension device 1 via data communication (S107). In response to this control signal, the control signal receiving unit 13 of the extension device 1 detects that a hold instruction has been given, and notifies the connection control unit 12 accordingly. The connection control unit 12 controls the switch unit 19 to connect the line of the voice communication unit 16 to the hard disk 18 so as to execute the hold process for the Line 2 on which the terminal device 2a is currently talking.

  In the hold process, Line 2 is connected to the hard disk 18 and the hold sound data and the recorded message in the hard disk 18 are reproduced. As a result, the call between the call partner and the terminal device 2a is terminated and put on hold. Note that the recording function may be executed by an operation from the terminal device 2a or a preset setting to record the message of the other party.

  Then, in response to the start of the hold state, the extension device 1 generates display information indicating that Line 2 is on hold, as shown in FIG. 4 (a), and transmits the display information to the terminal device 2a. It is displayed on the device 2a (S108). At the same time, the voice call of the terminal device 2a is disconnected (S110). The user of the terminal device 2a requests the user of the terminal device 2b to pick up by verbally specifying the line on hold (S109).

  On the terminal device 2b side, in response to the pickup request, the extension function dedicated application 23b is manually activated (S111), and the control signal for the intra-group line status acquisition request is transmitted to the extension device 1 via data communication. To do. Pickup processing is executed by acquiring display information indicating the intra-group line status in response to this control signal and displaying the intra-group line status on the display unit of the terminal device 2b as shown in FIG. 4 (b). It becomes possible (S112 to S115). Here, as shown in FIG. 4 (b), a call corresponding to the held line Line2 notified from the user of the terminal device 2a is selected from the intra-group line displayed on the display unit 26, and the call is selected. And pick up operation. In this embodiment, the pickup request is made verbally, but a control signal notifying that may be transmitted, and the extension function dedicated application may be automatically activated in response to the control signal.

  A pickup instruction is issued based on the operation in the terminal device 2b (S116), and the connection control unit 12 sets a voice call with the terminal device 2b for Line 2 that is on hold by the control signal of the pickup instruction. Is executed (S117). As the voice call setting, a method of starting a voice call from the terminal device 2b to the extension device 1 may be used, and conversely, a method of setting a call from the extension device 1 to the terminal device 2b may be used.

  With this voice call setting, a call is started between the call partner and the terminal device 2b. In response to this, the extension device 1 updates the line management database unit 17 so that the status of Lin2 is in a call by the terminal device 2b. Further, thereafter, the extension function dedicated application 23b of the terminal device 2b acquires new display information indicating the intra-group line status from the extension device 1 (S118), and updates the display information on the display unit 29.

(Operations and effects according to this embodiment)
As described above, according to the present embodiment, since the voice communication and the data communication are transmitted and received by the separate communication protocols between the terminal devices 2a and 2b and the extension device 1, a large data size control is performed. Signals can be transmitted and received, and more complicated extension operations can be realized. In addition, since the voice communication and the data communication are made independent, the display information received via the data communication can be displayed while the voice communication is maintained, and the user performs an operation based on the display information. The control signal by the user's operation can be transmitted to the network while maintaining the voice communication.

  As a result, in the extension telephone system, complex and advanced settings and processing based on user operations can be executed, and more advanced functions can be used when performing a virtual extension service using a landline telephone or mobile phone terminal on the public line network. Can be realized. In other words, functions for holding, transferring, and picking up between terminal devices can be realized, and when executing these functions, detailed information such as the telephone number of the other party of the call and the time when the call was held can be displayed. . Also, complicated operations can be performed from the terminal device to the extension device 1, and as described above, control is performed to perform various processes such as voice mail and message reproduction for a call on hold. be able to.

  In particular, in the present embodiment, the extension function control executed on the terminal device is an application that is activated and executed on the control unit 23, so that the terminal device is widely available on the market (cell phones and wireless LANs). The extension telephone service according to the present invention can be realized by using a telephone and a mobile phone with a wireless LAN function, and the cost required for introducing the system can be reduced.

  In addition, the extension function dedicated application 23b is activated by a call to the extension device 1 or an incoming call from the extension device 1, so that when an extension operation becomes necessary, the extension function 23b does not have to wait for a user's special operation. The function can be executed automatically, saving user operations, and the above-mentioned extension function can be activated only when communication with the extension device 1 is possible, and the extension function is unnecessary. It is possible to prevent the extension function from being performed wastefully below.

It is a block diagram which shows schematic structure of the extension telephone system which concerns on embodiment. It is a block diagram which shows the internal structure of the terminal device which concerns on embodiment. It is a sequence diagram which shows operation | movement of the extension telephone system which concerns on embodiment. It is explanatory drawing which shows the display information displayed on the terminal device which concerns on embodiment.

Explanation of symbols

1 ... Extension device
2a, 2b ... Terminal equipment
3 ... Public circuit switched network
11 ... Public line connection
12 ... Connection control unit
13 ... Control signal receiver
14… Display information transmitter
15 ... Data communication department
16 ... Voice communication part
17… Line management database
18… Hard disk
19 ... Switch part
20 ... Memory
21 ... Voice bearer
22: Voice communication protocol controller
23 ... Control unit
23a… Application for voice communication
23b… Extension function dedicated application
23c… Application for data communication
23d… Calling middleware
23e… Input middleware
23f… Display middleware
24 ... Data communication bearer
25 ... Data communication protocol controller
26 ... Display section
27… Calling part
28 ... Control unit
29… Display

Claims (10)

A terminal device provided with an extension telephone number and provided with voice communication means for voice communication;
An extension telephone system having an extension device that exchanges and connects a voice call that the terminal device makes and receives through a public line switching network and a voice call between the terminal devices,
The extension device retrieves a free line from a public line when an incoming call is received from a call partner on a public line switching network, assigns the found free line to communication between a terminal device and the call partner, and Make a voice call setting that the empty line is busy with the terminal device,
Furthermore, the extension device comprises:
Data communication means for performing data communication by a communication protocol independent of the communication protocol for exchanging and connecting the voice call;
In response to a display information request from the terminal device, a display information transmission unit that generates display information for displaying an exchange connection state in the extension device and transmits the display information to the terminal device via the data communication;
Connected to said inner beam apparatus by incoming call from the public network, the telephone number of a public telephone line, wherein the voice call setup becomes been busy done, extension of the sound Koeko setting is assigned to the terminal device which has been made A line management database for storing
A connection control unit that exchanges and connects a voice call through the public line switching network to the terminal device based on the telephone number of the public telephone line and the extension number;
A switch unit that receives a control signal transmitted from the terminal device and switches the exchange connection according to the control signal;
The terminal device
Data communication means for performing the data communication;
Extension function control that receives the display information through the call data communication means, displays the received display information, and transmits the control signal to the extension device in parallel with the voice call by the voice communication means. And
The extension function control unit is an application executed on the terminal device, and the application is activated by an incoming call from the extension device, and the display relating to an intra-group line state in which a call is started by the voice call setting Sending an information request to the extension device;
The extension telephone system, wherein the control signal is transmitted through the data communication by the activated application. The process related to the exchange connection includes a process of placing the call on hold, calling another terminal device, and executing the exchange connection of the call according to a pickup that is a response by the other terminal device.
The application has a function of transmitting a control signal notifying the pickup request when the other terminal device is called, and the application requests the pickup at the called other terminal device side. 2. The extension telephone system according to claim 1, wherein the extension telephone system is also activated by a control signal to be notified . The extension device is provided with a voice mail function for recording and reproducing voices,
In the processing related to the exchange connection, in response to a control signal from the terminal device, a call to the terminal device is connected to the answering function, and the voice of the other party is recorded, or a message stored in the answering function 2. The extension telephone system according to claim 1, further comprising: A terminal device provided with an extension telephone number and provided with voice communication means for voice communication;
An extension device that exchanges and connects a voice call that the terminal device makes and receives through the public line switching network and a voice call between the terminal devices;
The extension device retrieves a free line from a public line when an incoming call is received from a call partner on a public line switching network, assigns the found free line to communication between a terminal device and the call partner, and Make a voice call setting that the empty line is busy with the terminal device,
Furthermore, the extension device is
In response to a display information request from the terminal device, a display information transmission unit that generates display information for displaying an exchange connection state in the extension device and transmits the display information to the terminal device;
A telephone number of a public telephone line that is connected to the extension device by an incoming call from the public line network and is in a voice call setting and is in a call, and an extension number assigned to the terminal device in which the voice call setting is made A line management database for storing
A connection control unit that exchanges and connects a voice call through the public line switching network to the terminal device based on the telephone number of the public telephone line and the extension number;
A terminal device used in an extension telephone system that receives a control signal transmitted from the terminal device and has a switch unit that switches the exchange connection according to the control signal;
Data communication means for performing data communication by a communication protocol independent of the communication protocol for exchanging and connecting the voice call;
In parallel with the voice call by the voice communication means, through the call data communication means, display information for displaying the exchange connection status in the extension device is received, the received display information is displayed, and the extension device An extension function control unit for transmitting a control signal for switching the exchange connection in
The extension function control unit is an application executed on the terminal device, and the application is activated by an incoming call from the extension device, and the display relating to an intra-group line state in which a call is started by the voice call setting Sending an information request to the extension device;
The terminal device, wherein the control signal is transmitted via the data communication by the activated application. The process related to the exchange connection includes a process of placing the call on hold, calling another terminal device, and executing the exchange connection of the call according to a pickup that is a response by the other terminal device.
The application has a function of transmitting a control signal notifying the pickup request when the other terminal device is called, and the application requests the pickup at the called other terminal device side. 5. The terminal device according to claim 4, wherein the terminal device is also activated by a control signal to be notified . An extension device for constructing the extension telephone system according to claim 1 ,
When an incoming call is received from a call partner on the public line switching network, a free line is searched from the public line, the searched free line is assigned to communication between the terminal device and the call partner, and the searched free line is the terminal. Make a voice call setting to make a call by the device,
Data communication means for performing data communication by a communication protocol independent of the communication protocol for exchanging and connecting the voice call;
In response to a display information request from the terminal device, a display information transmission unit that generates display information for displaying an exchange connection state in the extension device and transmits the display information to the terminal device via the data communication;
Connected to said inner beam apparatus by incoming call from the public network, the telephone number of a public telephone line, wherein the voice call setup becomes been busy made, allocated to the terminal apparatus becomes busy with the sound Koeko set A line management database that stores the extension numbers in association with each other;
A connection control unit that exchanges and connects a voice call through the public line switching network to the terminal device based on the telephone number of the public telephone line and the extension number;
A switch unit that receives a control signal transmitted from the terminal device and switches the exchange connection according to the control signal;
On the terminal device, an application executed on the terminal device is activated by an incoming call from the extension device, and the application issues a display information request regarding the intra-group line status where a call is started by the voice call setting. , Send to the extension device,
The extension device is characterized in that the control signal is transmitted via the data communication by the activated application. It further has an answering machine function for recording and playing back sound,
In the processing related to the exchange connection, in response to a control signal from the terminal device, a call to the terminal device is connected to the answering function, and the voice of the other party is recorded, or a message stored in the answering function 7. The extension device according to claim 6, further comprising a process of executing the reproduction of. A terminal device provided with an extension telephone number and provided with voice communication means for voice communication;
An extension telephone method using an extension device that exchanges and connects a voice call through the public line switching network to the terminal device based on a telephone number and an extension number of the public telephone line,
Upon receiving an incoming call from a call partner on the public line network , a free line is searched from the public line, the searched free line is assigned to communication between the terminal device and the call partner, and the searched free line is the terminal. No voice call setup to a call by the device, outgoing the call, exchanged connected to the terminal device based on the telephone number and the extension number of the public telephone line, from the inner-ray apparatus relative to the terminal device And
The telephone number of the public telephone line on which the voice call setting has been made and the call is in progress and the extension number assigned to the terminal device on which the voice call setting has been made are stored in the line management database in association with each other,
An application executed on the terminal device is activated by an incoming call from the extension device, and the display information request relating to the intra-group line state in which a call is started by the voice call setting from the application is sent to the extension device. Transmitting the voice call by data communication based on a communication protocol independent of the communication protocol for exchanging and connecting the voice call;
Receiving the display information in parallel with the voice call by the voice communication means through the data communication, displaying the received display information, and transmitting the control signal to the extension device (2);
The control signal transmitted from the terminal device via the data communication by the activated application is received at the extension device, and the switching connection is switched according to the control signal (3). An extension telephone method characterized by comprising: The process related to the exchange connection in the step (3) includes a process of placing the call on hold, calling another terminal device, and executing the exchange connection of the call according to the pickup that is a response by the other terminal device. And
The application has a function of transmitting a control signal notifying the pickup request when the other terminal device is called, and the application requests the pickup at the called other terminal device side. 9. The extension telephone method according to claim 8, which is also activated by a control signal to be notified . The extension device is provided with an answering machine function for recording and reproducing voice,
In the processing relating to the exchange connection in the step (3), in response to a control signal from the terminal device, a call to the terminal device is connected to the answering function, and the voice of the other party is recorded. 9. The extension telephone method according to claim 8, further comprising a process of executing reproduction of a message stored in the function.

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