JP5686049B2 - Telephone system - Google Patents

Description

  The present invention relates to a telephone control technique, and more particularly to a remote connection technique for connecting a telephone terminal connected from the outside to a telephone system as an extension terminal of the telephone system.

In a business facility such as an office or a store, a telephone system including a telephone control device such as a button telephone device or a PBX that exchanges and connects a plurality of extension terminals to a telephone network is used.
In such a telephone system, a technique for providing an environment similar to that of an extension terminal connected to the telephone control apparatus to the mobile phone terminal of the user who has gone out has been studied.

  As a general method for making a voice call by accessing a telephone terminal connected from the outside of the telephone system to the extension terminal of the telephone system, a method of disclosing the IP address of the SIP server used in the telephone system can be considered. In this method, when an outside terminal connected to the telephone system is designated as a destination by accessing the SIP server from the telephone terminal of the user who has gone out via the Internet, the address is converted by the SIP server and The extension terminal is called directly.

  However, according to this method, since the address of the SIP server is disclosed, there is a possibility that a third party illegally connects to the extension terminal of the telephone system. In addition, the user who has gone out has an extension call using the unencrypted VoIP method via the Internet. For this reason, there is a risk of eavesdropping and the like, and sufficient security cannot be obtained as an extension call. Further, since it is necessary to set a global IP address for each extension terminal, the management cost also increases.

  Conventionally, in such a telephone system, in addition to a main extension terminal connected to the telephone control device by extension, a secondary extension terminal remotely connected to the telephone control device via the Internet is provided, and these two terminals are associated with each other and called. A control technique has been proposed (see, for example, Patent Document 1). According to this technology, call control is performed as a pair of a main extension terminal connected by extension and a sub-extension terminal remotely connected via the Internet.

  Specifically, when an extension incoming call or an external incoming call occurs to the main extension terminal, the incoming call is notified not only to the main extension terminal but also to the corresponding secondary extension terminal, or one extension terminal is in the middle of a call When one of the extension terminals goes off-hook, call control such as switching the call from one extension terminal to the other extension terminal is performed. As a result, even when the user is at home or away from home, the sub-telephone terminal can be used in the same environment as the main extension terminal installed in the business facility.

JP 2006-033684 A JP 2002-351829 A

  However, in such a conventional technique, in the telephone control device of the telephone system, it is necessary to perform call control as a pair of a main extension terminal connected by extension and a sub-extension terminal remotely connected via the Internet. Therefore, it is necessary to greatly change the call control in the telephone control device. For this reason, the existing telephone control device cannot easily cope with it, and a new telephone control device is required. Therefore, there has been a problem that an external telephone terminal cannot be easily remotely connected to an existing telephone system as a virtual extension terminal.

  In the prior art, the main extension terminal connected by extension and the sub-extension terminal remotely connected via the Internet are call-controlled as a pair. For this reason, since the paired main extension terminal and sub-extension terminal operate as one extension terminal in operation, the sub-extension terminal cannot be used as one independent extension terminal. For this reason, not only the usability is bad, but only half of all the extension terminals in the telephone system are actually used, and there is a problem that the operation efficiency is poor.

  The present invention is intended to solve such problems, and an object of the present invention is to provide a remote connection technology that can easily connect an external telephone terminal as a virtual extension terminal to an existing telephone system. It is said.

In order to achieve such an object, a telephone system according to the present invention exchanges call control messages with a plurality of extension terminals having an IP telephone function and these extension terminals via an internal communication line. By connecting the terminal to the telephone network, and remotely connecting the telephone control device for interconnecting these extension terminals and the external telephone terminal having the IP telephone function based on the remote desktop function via the communication network. The RD server that performs data communication with the external telephone terminal and the internal communication line are connected to exchange call control messages with the telephone control device, and the call control messages and the RD server Relay the call control message exchanged with the external telephone terminal. And a extension hub for connecting a virtual extension terminal to said telephone control device, extension hub advance establish a separate IP session for each virtual extension terminal via the internal communication line with the RD server in advance, RD When a call control message is exchanged with an external telephone terminal via a server, the call control message is exchanged via an IP session corresponding to the virtual extension terminal of the external telephone terminal among these IP sessions. It is.

At this time, the extension hub exchanges voice packets with the extension terminals via the internal communication line, and relays these voice packets and voice packets exchanged with the external telephone terminal via the RD server. Thus, when a voice call between the extension terminal and the external telephone terminal is realized and voice packets are exchanged with the external telephone terminal via the RD server, the virtual extension terminal of the external telephone terminal in the IP session is exchanged. The voice packet may be exchanged via a corresponding IP session .

In addition, by remotely connecting to an external telephone terminal via a communication network with an RD server of the telephone system based on a remote desktop function, an RD client that performs data communication with an extension hub, and an IP telephone function A call processing unit for performing a call control operation of the external telephone terminal based on the call control message, a VoIP voice call based on the voice packet, and a relay processing of the call control message from the call processing unit to the extension hub In addition, a call control unit that relays a call control message from the extension hub to the call processing unit may be provided.

  According to the present invention, among the existing telephone systems, an extension hub is connected in the same manner as the extension terminal of the telephone control apparatus, and an RD server is connected to the extension hub, so An external telephone terminal can be easily connected remotely as a virtual extension terminal.

In addition, since the external telephone terminal remotely connected in this way is controlled by an individual extension telephone number assigned in advance, the external telephone terminal can be used as one independent extension terminal. For this reason, the usability is improved and all the extension terminals in the telephone system are actually used, so that high operational efficiency can be obtained.
In addition, since a unique message can be exchanged as a call control message exchanged between the telephone system and the external telephone terminal, a control message specific to the telephone system can be exchanged, and functions similar to those of the extension terminal Can also be used on external phone terminals.

  In particular, when the remote desktop function is used, the telephone system and the external telephone terminal are connected via a tunneled link, so that voice packets can be exchanged securely without using other services such as VPN. can do. Therefore, the voice call is not easily eavesdropped, and high security can be obtained. Also, it is not necessary to disclose the router port, and unauthorized access by a third party using a security hole can be prevented.

It is a block diagram which shows the structure of the telephone system concerning 1st Embodiment. It is a sequence diagram which shows the incoming call operation | movement of the telephone system concerning 1st Embodiment. It is a sequence diagram which shows the transmission operation | movement of the telephone system concerning 1st Embodiment. It is a block diagram which shows the structure of the telephone system concerning 2nd Embodiment. It is a block diagram which shows the structure of the telephone system concerning 3rd Embodiment. It is a sequence diagram which shows the incoming call operation | movement of the telephone system concerning 3rd Embodiment. It is a sequence diagram which shows the transmission operation | movement of the telephone system concerning 3rd Embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a telephone system 10 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the telephone system according to the first embodiment.
The telephone system 10 is composed of a telephone exchange device such as a button telephone device or a PBX as a whole, and exchanges a plurality of extension terminals 12 and these extension terminals 12 connected by extension via a communication line L with a telephone network 31. And a telephone control device 11 to be connected.

  In the present embodiment, an RD server is provided for performing data communication with an external telephone terminal having an IP telephone function via a communication network by using a remote desktop function, thereby providing internal communication. The extension hub connected to the line exchanges call control messages with the telephone control device, and relays these call control messages and call control messages exchanged with external telephone terminals via the RD server. By processing, the external telephone terminal is connected to the telephone control apparatus as a virtual extension terminal.

[Telephone system]
Next, the configuration of the telephone system 10 according to the present embodiment will be described in detail with reference to FIG.
The telephone system 10 is provided with a telephone control device 11, an extension terminal 12, an extension hub 13, an RD server 14, and a router 15 as main functional units.

  The telephone control device 11 includes a call control server such as a SIP server, and exchanges call control messages with the extension terminal 12 and the extension hub 13 via the internal communication line L, so that the extension terminal 12 and the extension hub 13 can communicate with each other. It has a function of exchanging and connecting virtual extension terminals to the telephone network 31 such as an IP telephone network and a function of interconnecting the extension terminals 12 including these virtual extension terminals. At this time, the telephone control device 11 does not recognize the difference between the extension terminal 12 and the virtual extension terminal realized by the extension hub 13, and performs call control using the virtual extension terminal as the extension terminal 12.

  The extension terminal 12 is a general telephone terminal having an IP telephone function, and performs a call control operation of the extension terminal 12 by exchanging a call control message with the telephone control device 11 via the internal communication line L. Function and other extension terminal 12 connected via the internal communication line L, a partner telephone terminal (not shown) connected from the telephone control device 11 via the telephone network 31, or connection via the extension hub 13 The external telephone terminal 20 has a function of performing a VoIP voice call by exchanging voice packets such as RTP. The extension terminal 12 may be an IP telephone used in a button telephone system or a PBX system, or a soft phone of a PC terminal such as a personal computer.

  The extension hub 13 is a gateway device that relays call control messages and voice packets based on a call control protocol such as SIP, and the telephone control device 11 is assigned one or more extension numbers assigned in advance. Operates as a virtual extension terminal. In this extension hub 13, a correspondence relationship between the extension number and the address of the external telephone terminal 20 is registered. This correspondence relationship is notified to the RD server 14, and each virtual extension terminal is connected to the RD server 14. Individual IP sessions are established in advance.

  The extension hub 13 has a function for exchanging call control messages with the telephone control device 11 via the internal communication line L as a call control processing function, and a call with the external telephone terminal 20 via the RD server 14. The function of exchanging control messages and the call control message exchanged between the telephone control device 11 and the external telephone terminal 20 are relayed to each other, so that the external telephone terminal 20 is used as a virtual extension terminal to the telephone control device 11. It has a function to connect.

  The extension hub 13 has a function of exchanging voice packets with the extension terminal 12 via the internal communication line L as an extension voice processing function and a voice with the external telephone terminal 20 via the RD server 14. A function of exchanging packets, and a function of realizing a voice call between the extension terminal 12 and the external telephone terminal 20 by mutually relaying voice packets exchanged between the extension terminal 12 and the external telephone terminal 20; have.

  The RD server 14 has a function of performing data communication with the external telephone terminal 20 by remotely connecting to the external telephone terminal 20 based on a remote desktop function via a communication network 32 such as the Internet, and an RD client. 22 has a function of confirming the protocol type of the packet received from the port number based on the port number and the like, and transferring the protocol type of SIP / RTP to the extension hub 13.

  The remote desktop function is a function developed to remotely control a remote computer on the network (see, for example, Patent Document 2), and virtual network computing is a similar function. Since such a remote connection link is tunneled, high security can be obtained and packets of various protocols such as SIP / RTP can be transferred.

The router 15 includes a router device such as an optical line termination unit (ONU), and is connected between the RD server 14 and the communication network, and has a function of relaying and connecting data communication between the RD server 14 and the communication network. ing.
Among these functional units, the telephone control device 11, the extension terminal 12, the extension hub 13, and the RD server 14 are connected so as to be able to exchange various packets with each other via an internal communication line L formed of a LAN line or the like. .

[External phone terminal]
Next, the configuration of the external telephone terminal 20 will be described with reference to FIG.
The external telephone terminal 20 is composed of a mobile communication terminal such as a mobile phone and a smart phone having an IP telephone function as a whole, and an information communication terminal such as a PC terminal. The main functional units include a network I / F unit 21, An RD client 22, a call control unit 23, and a call processing unit 24 are provided.

The network I / F unit 21 has a function of performing data communication with a router of the telephone system 10 via a communication network 32 such as the Internet.
The RD client 22 has a function of performing data communication with the extension hub 13 by remotely connecting to the RD server 14 of the telephone system 10 via the communication network 32 based on the remote desktop function. .

  The call control unit 23 has a gateway function that relays call control messages and voice packets based on a call control protocol such as SIP, and operates as a SIP gateway for the call processing unit 24. In this call control unit 23, an extension number assigned in advance to the external telephone terminal 20 and the address of the external telephone terminal 20 are registered in association with each other, and based on this association, a call control message or voice packet transfer destination is registered. Confirm.

  The call control unit 23 also has a function for exchanging call control messages with the call processing unit 24 via the internal bus B and a call system 10 via the RD client 22 as call control processing functions. The external telephone terminal 20 is connected to the telephone system 10 as a virtual extension terminal by mutually relaying the call control message exchanged between the function for exchanging call control messages and the call processing unit 24 and the telephone system 10. It has the function to do.

  Furthermore, the call control unit 23 has a function of exchanging voice packets with the call processing unit 24 via the internal bus B as a voice processing function, and a telephone system 10 via the RD client 22 from the internal bus B. A voice call between the external telephone terminal 20 and the telephone system 10 is realized by mutually relaying the voice packet exchanged between the voice packet exchange function and the voice processing part 24 and the telephone system 10. It has the function to do.

  The call processing unit 24 has a general telephone terminal function having an IP telephone function, and exchanges a call control message with the call control unit 23 via the internal bus B to perform a call control operation of the external telephone terminal 20. And a function of performing a VoIP voice call by exchanging voice packets such as RTP with the call control unit 23 via the internal bus B.

[Operation of First Embodiment]
Next, the operation of the telephone system 10 according to the present embodiment will be described with reference to FIG. FIG. 2 is a sequence diagram showing an incoming operation of the telephone system according to the first embodiment.
Here, an incoming call operation when the extension terminal 12 of the telephone system 10 is called from the external telephone terminal 20 will be described.

  In order to access the telephone system 10 as a virtual extension terminal, the external telephone terminal 20 accesses the RD server 14 of the telephone system 10 via the communication network 32 from the RD client 22 in advance according to a user operation. A remote connection is established (step 100).

Thereafter, in response to the extension call operation by the user (step 110), the call processing unit 24 notifies the call control unit 23 of a call request message including the called extension number indicating the extension terminal 12 of the telephone system 10 ( Step 111).
In response to the call request message from the call processing unit 24, the call control unit 23 notifies the RD client 22 of an incoming call notification message for the extension terminal 12 of the called extension number included in the message (step 112).
The RD client 22 transmits an incoming call notification message from the call control unit 23 to the telephone system 10 via a remote connection established with the RD server 14.

  When the RD server 14 of the telephone system 10 receives an arbitrary packet from the external telephone terminal 20 via a remote connection, the RD server 14 checks the protocol type of the packet (step 113). Here, since the received incoming notification message is call data, the message is notified to the extension hub 13 via the internal communication line L (step 113: YES).

  At this time, an individual IP session is established in advance between the RD server 14 and the extension hub 13 for each virtual extension terminal assigned to the extension hub 13. When the RD server 14 exchanges a call control message or voice packet with the extension hub 13, the RD server 14 confirms the address of the external telephone terminal 20 from the call control message or voice packet, and makes a virtual extension with the extension hub 13. A corresponding IP session is selected from the IP sessions connected to each terminal, and call control messages and voice packets are exchanged with the extension hub 13 via the IP session.

  When the extension hub 13 receives an incoming notification message from the external telephone terminal 20 via the RD server 14, the extension hub 13 confirms the extension number of the corresponding virtual extension terminal based on the address of the external telephone terminal 20 acquired from the message. Then, a call request message to the called extension number included in the message, with this extension number as the calling extension number, is notified to the telephone control device 11 via the internal communication line L (step 114).

In response to a call request message from the extension hub 13, the telephone control device 11 receives an incoming call from the virtual extension terminal corresponding to the external telephone terminal 20 to the extension terminal 12 corresponding to the called extension number included in the message. Is notified through the internal communication line L (step 115).
The extension terminal 12 displays an incoming call to notify the incoming call in response to the incoming call notification message from the telephone control device 11 (step 116).

When a response operation is performed at the extension terminal 12 according to the incoming call display (step 120), the extension terminal 12 notifies the telephone control device 11 of a response message to the incoming call notification message via the internal communication line L. (Step 121).
In response to the response message from the extension terminal 12, the telephone control device 11 notifies the response message to the virtual extension terminal corresponding to the calling extension number included in the message, that is, the extension hub 13 (step 122). .

In response to the response message from the telephone control device 11, the extension hub 13 identifies the external telephone terminal 20 corresponding to the calling extension number included in the message, and sends a response message to the external telephone terminal 20 as follows: The RD server 14 is notified via the IP session for the external telephone terminal 20 (step 123).
The RD server 14 transmits a response message from the extension hub 13 to the external telephone terminal 20 via a remote connection established with the RD client 22.

  When the RD client 22 of the external telephone terminal 20 receives an arbitrary packet from the telephone system 10 via the remote connection, it checks the protocol type of the packet (step 124). Here, since the received response message is call data, the message is notified to the call control unit 23 via the internal bus B (step 124: YES).

The call control unit 23 notifies the call processing unit 24 of the response message notified from the RD client 22 via the internal bus B (step 125).
As a result, voice packets are transmitted between the call processing unit 24 of the external telephone terminal 20 and the extension terminal 12 of the telephone system 10 via the remote connection established between the RD server 14 and the RD client 22. Exchange is started and VoIP notification is started (step 130).

Next, the operation of the telephone system 10 according to the present embodiment will be described with reference to FIG. FIG. 3 is a sequence diagram illustrating a transmission operation of the telephone system according to the first embodiment.
Here, a transmission operation when the external telephone terminal 20 is called from the extension terminal 12 of the telephone system 10 will be described.

  In order to access the telephone system 10 as a virtual extension terminal, the external telephone terminal 20 accesses the RD server 14 of the telephone system 10 via the communication network 32 from the RD client 22 in advance according to a user operation. A remote connection is established (step 100).

Thereafter, in response to the extension call operation by the user (step 150), the extension terminal 12 of the telephone system 10 sends a call request message including the called extension number indicating the virtual extension terminal corresponding to the external telephone terminal 20 to the internal call. The telephone control device 11 is notified via the communication line L (step 151).
In response to the call request message from the extension terminal 12, the telephone control device 11 notifies the corresponding virtual extension terminal, that is, the extension hub 13, of an incoming call notification message for the extension terminal of the called extension number included in the message ( Step 152).

In response to the incoming notification message from the telephone control device 11, the extension hub 13 identifies the external telephone terminal 20 corresponding to the called extension number included in the message, and sends a call request message to the external telephone terminal 20 To the RD server 14 via the IP session for the external telephone terminal 20 (step 153).
The RD server 14 transmits a call request message from the extension hub 13 to the external telephone terminal 20 via a remote connection established with the RD client 22.

  When the RD client 22 of the external telephone terminal 20 receives an arbitrary packet from the telephone system 10 via the remote connection, it confirms the protocol type of the packet (step 154). Here, since the received call request message is call data, the message is notified to the call control unit 23 via the internal bus B (step 154: YES).

The call control unit 23 notifies the incoming call notification message to the call processing unit 24 via the internal bus B in response to the call request message notified from the RD client 22 (step 155).
In response to the incoming notification message from the call control unit 23, the call processing unit 24 displays an incoming call to notify the extension incoming call (step 156).

When a response operation is performed on the external telephone terminal 20 in response to this incoming call display (step 160), the call processing unit 24 sends a response message to the incoming call notification message to the call control unit 23 via the internal bus B. Notification is made (step 161).
In response to the response message from the call processing unit 24, the call control unit 23 notifies the RD client 22 of a response message for the extension terminal 12 of the calling party extension number included in the message (step 162).
The RD client 22 transmits a response message from the call control unit 23 to the telephone system 10 via a remote connection established with the RD server 14.

  When the RD server 14 of the telephone system 10 receives an arbitrary packet from the external telephone terminal 20 via the remote connection, the protocol type of the packet is confirmed (step 163). Here, since the received response message is call data, the message is notified to the extension hub 13 via the IP session to the external telephone terminal 20 (step 163: YES).

  When the extension hub 13 receives the response message from the external telephone terminal 20 via the RD server 14, the extension hub 13 confirms the extension number of the corresponding virtual extension terminal based on the address of the external telephone terminal 20 acquired from the message. Then, a response message to the calling extension number included in the message, with the extension number as the called extension number, is notified to the telephone control device 11 via the internal communication line L (step 164).

In response to the response message from the extension hub 13, the telephone control device 11 sends a response from the virtual extension terminal corresponding to the external telephone terminal 20 to the extension terminal 12 corresponding to the calling extension number included in the message. A response message to be notified is notified through the internal communication line L (step 165).
As a result, voice packets are transmitted between the call processing unit 24 of the external telephone terminal 20 and the extension terminal 12 of the telephone system 10 via the remote connection established between the RD server 14 and the RD client 22. Exchange is started and VoIP notification is started (step 170).

[Effect of the first embodiment]
As described above, the present embodiment provides the RD server 14 that performs data communication with the external telephone terminal 20 by remote connection with the external telephone terminal 20 by the remote desktop function via the communication network 32. In addition, the extension hub 13 connected to the internal communication line L exchanges call control messages with the telephone control device 11, and between these call control messages and the external telephone terminal 20 via the RD server 14. By relaying the exchanged call control message, the external telephone terminal 20 is connected to the telephone control apparatus 11 as a virtual extension terminal.

  Accordingly, in the existing telephone system 10, the extension hub 13 is connected in the same manner as the extension terminal 12 of the telephone control device 11, and the RD server 14 is connected to the extension hub 13, thereby allowing the telephone system 10 to be connected. The external external telephone terminal 20 can be easily connected remotely as a virtual extension terminal.

Further, since the external telephone terminal 20 remotely connected in this way is controlled by an individual extension telephone number assigned in advance, the external telephone terminal 20 can be used as one independent extension terminal. . For this reason, the usability is improved and all the extension terminals in the telephone system 10 are actually used, and high operational efficiency is obtained.
Furthermore, since a unique message can be exchanged as a call control message exchanged between the telephone system 10 and the external telephone terminal 20, a control message specific to the telephone system 10 can be exchanged. The same function can be used on the external telephone terminal 20 as well.

  When the remote desktop function is used, since the telephone system 10 and the external telephone terminal 20 are connected via a tunneled link, voice packets can be exchanged securely without using other services such as VPN. can do. Therefore, the voice call is not easily eavesdropped, and high security can be obtained. Also, it is not necessary to disclose the router port, and unauthorized access by a third party using a security hole can be prevented.

  In the present embodiment, the extension hub 13 exchanges voice packets with the extension terminal 12 via the internal communication line L, and communicates these voice packets with the external telephone terminal 20 via the RD server 14. Since the voice packets exchanged between the extension terminals 12 and the RD server 14 in the telephone system 10 are not relayed, the telephone system 10 does not perform the procedure for directly exchanging voice packets. Voice packets can be easily exchanged with the external telephone terminal 20. Thereby, the voice call between the extension terminal 12 and the external telephone terminal 20 can be realized very easily.

  In the present embodiment, the case where the external telephone terminal 20 makes an extension call with the extension terminal 12 of the telephone system 10 has been described as an example. However, the present invention is not limited to this, and the external telephone terminal is not limited thereto. 20 can also make an outside line call with a partner telephone terminal (not shown) connected to the telephone network 31 via the telephone system 10.

In this case, a function for exchanging voice packets with the telephone control apparatus 11 via the internal communication line L as an external line voice processing function to the extension hub 13 and between the telephone control apparatus 11 and the external telephone terminal 20. It is only necessary to provide a function for realizing a voice call between the other telephone terminal and the external telephone terminal 20 connected from the telephone control device 11 via the telephone network 31 by mutually relaying the voice packets exchanged in the above. .
As a result, the telephone control device 11 performs call control for the virtual extension terminal corresponding to the external telephone terminal 20 in the same manner as the extension terminal 12, so that the external telephone terminal 20 is connected to the telephone network 31 via the telephone system 10. It is possible to make an outside line call with the other party telephone terminal (not shown).

  In the present embodiment, the RD client 22 of the external telephone terminal 20 can be mounted in advance on a small electronic device having a USB interface. Thereby, the external telephone terminal 20 can be added to the RD client 22 very easily by the operation of connecting the small electronic device to the USB interface of the existing external telephone terminal 20. Furthermore, in addition to the RD client 22, the call control unit 23 may be mounted on a small electronic device. Therefore, it is not necessary to install the software for realizing the RD client 22 and further the call control unit 23 in the external telephone terminal 20, and the work burden on the user can be greatly reduced.

Further, if the small electronic device is removed from the external telephone terminal 20, it becomes impossible to remotely connect to the telephone system 10, so that unauthorized use of the external telephone terminal 20 can be easily prevented.
Furthermore, since the remote desktop function is provided with a monitoring function, protocol monitoring can be performed. For this reason, the extension hub 13 of the telephone system 10 can perform user restriction and management, or call restriction and call management. When SSH is applied, maintenance work can be monitored using a remote maintenance function.

[Second Embodiment]
Next, the telephone system 10 according to the second exemplary embodiment of the present invention is described with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of a telephone system according to the second embodiment.

  In the first embodiment, the case where the external telephone terminal 20 makes an extension call with the extension terminal 12 of the telephone system 10 has been described as an example. In the present embodiment, a case where the external telephone terminal 20 performs data communication with the data communication terminal 16 of the telephone system 10 will be described.

In the present embodiment, one or more data communication terminals 16 are provided in the telephone system 10, and one or more data communication processing units 25 are provided in the external telephone terminal 20.
The data communication terminal 16 includes a general data communication terminal such as a server device or a PC terminal having a data communication function, is connected to the internal communication line L, and is connected to the external telephone terminal 20 via the RD server 14. Have a function of exchanging data packets.
The RD server 14 confirms the protocol type of the packet received from the RD client 22, transfers the packet to the extension hub 13 if the protocol type is SIP / RTP, and the protocol if the protocol type is not SIP / RTP. It has a function of transferring the packet to the data communication terminal 16 preset for the type.

The data communication processing unit 25 has a function of exchanging data packets with the telephone system 10 via the RD client 22 in response to a request from the upper application.
The RD client 22 confirms the protocol type of the packet received from the RD server 14, transfers the packet to the call processing unit 24 if the protocol type is SIP / RTP, and if the protocol type is other than SIP / RTP, It has a function of transferring the packet to the data communication processing unit 25 set in advance for the protocol type.

As described above, in the remote connection using the remote desktop function, since the link is tunneled, not only SIP / RTP but also packets of various protocols such as FTP, HTTP, SSH, DHCP, and SNMP are exchanged. be able to.
Accordingly, in the same manner as when packets related to SIP / RTP for VoIP voice calls are exchanged between the extension hub 13 of the telephone system 10 and the call processing unit 24 of the external telephone terminal 20, the telephone system 10 The data communication terminal 16 and the data communication processing unit 25 of the external telephone terminal 20 may be exchanged.

[Effect of the second embodiment]
Thus, in the present embodiment, based on the remote desktop function between the RD server 14 and the RD client 22 between the data communication terminal 16 of the telephone system 10 and the data communication processing unit 25 of the external telephone terminal 20. Various data packets other than SIP / RTP are exchanged via remote connection.

As a result, it becomes possible to access the telephone system 10 from the external telephone terminal 20 using many applications other than the IP telephone application. At this time, since the link of the remote connection is tunneled, it is difficult for a third party to eavesdrop, and since it is not necessary to open the router port, unauthorized entry from the outside can also be prevented. High security can be maintained in the exchange.
Accordingly, it is possible to access the data communication terminal 16 from an outside location and use services such as data browsing and input, transmission / reception of e-mails, IP video conferencing, etc., and extremely high convenience can be obtained for outing users.

[Third Embodiment]
Next, with reference to FIG. 5, the telephone system 10 concerning the 3rd Embodiment of this invention is demonstrated. FIG. 5 is a block diagram showing a configuration of a telephone system according to the third embodiment.

  In the first embodiment, the telephone system 10 is provided with the RD server 14 and the external telephone terminal 20 is provided with the RD client 22, and the remote connection based on the remote desktop function between the RD server 14 and the RD client 22 is provided. The case where SIP / RTP packets are exchanged between the extension hub 13 of the telephone system 10 and the call control unit 23 of the external telephone terminal 20 has been described as an example.

  In the present embodiment, the SIP / RTP packet is not transmitted between the extension hub 13 and the external telephone terminal 20 without using the remote connection based on the remote desktop function between the telephone system 10 and the external telephone terminal 20. The case of exchanging will be described.

  In the present embodiment, the extension hub 13 of the telephone system 10 comprises a gateway device that relays call control messages and voice packets based on a call control protocol such as SIP, and is assigned to the telephone control device 11 in advance. Operate as a virtual extension terminal having one or more extension numbers.

  In the present embodiment, the telephone system 10 is not provided with the RD server 14. Instead, the data communication I / F that performs data communication with the external telephone terminal 20 via the communication network 32 is made to the extension hub 13. Is provided. As a result, the extension hub 13 transmits data to the corresponding external telephone terminal 20 for each virtual extension terminal based on the correspondence relationship between the extension number and the address of the external telephone terminal 20 registered in advance. Individual IP sessions are established in advance via the communication I / F unit.

  The extension hub 13 has a function for exchanging call control messages with the telephone control device 11 via the internal communication line L as a call control processing function, and an external telephone terminal 20 via the data communication I / F unit. A function for exchanging call control messages with the external telephone terminal and a call control message exchanged between the telephone control device 11 and the external telephone terminal 20 are mutually relayed to make the external telephone terminal 20 a virtual extension terminal. And a function of connecting to the telephone control device 11.

  Further, the extension hub 13 has a function of exchanging voice packets with the extension terminal 12 via the internal communication line L as an extension voice processing function, and an external telephone terminal 20 via the data communication I / F unit. A voice call between the extension terminal 12 and the external telephone terminal 20 is realized by mutually relaying the voice packet exchanged between the function of exchanging voice packets between the extension terminal 12 and the external telephone terminal 20. It has the function to do.

  In the present embodiment, the external telephone terminal 20 is not provided with the RD client 22, and SIP / RTP or the like is provided between the call control unit 23 and the network I / F unit 21 via the internal bus B. Packets are exchanged.

  That is, the call control unit 23 includes a gateway function that relays a call control message and a voice packet based on a call control protocol such as SIP. As a call control processing function, the call control unit 23 communicates with the call processing unit 24 via the internal bus B. A function for exchanging call control messages in the network, a function for exchanging call control messages with the telephone system 10 via the network I / F unit 21, and an exchange between the call processing unit 24 and the telephone system 10. It has a function of connecting the external telephone terminal 20 to the telephone system 10 as a virtual extension terminal by mutually relaying call control messages.

  Further, the call control unit 23 has a function of exchanging voice packets with the call processing unit 24 via the internal bus B as a voice processing function, and a telephone system from the internal bus B via the network I / F unit 21. The voice packet between the external telephone terminal 20 and the telephone system 10 can be relayed between the function of exchanging voice packets with the telephone 10 and the voice packets exchanged between the call processing unit 24 and the telephone system 10. And a function for realizing a call.

[Operation of Third Embodiment]
Next, with reference to FIG. 6, operation | movement of the telephone system 10 concerning this Embodiment is demonstrated. FIG. 6 is a sequence diagram illustrating an incoming operation of the telephone system according to the third embodiment.
Here, an incoming call operation when the extension terminal 12 of the telephone system 10 is called from the external telephone terminal 20 will be described.

Thereafter, in response to the extension call operation by the user (step 300), the call processing unit 24 notifies the call control unit 23 of a call request message including the called extension number indicating the extension terminal 12 of the telephone system 10 ( Step 301).
In response to the call request message from the call processing unit 24, the call control unit 23 sends an incoming notification message to the extension terminal 12 of the called extension number included in the message via a link on the communication network 32 with the telephone system 10. Then, the data is transmitted from the network I / F unit 21 to the telephone system 10 (step 302).

  When the extension hub 13 of the telephone system 10 receives an incoming notification message from the external telephone terminal 20 via a link on the communication network 32, the extension hub 13 corresponds to the corresponding virtual extension based on the address of the external telephone terminal 20 acquired from the message. Confirm the extension number of the terminal and notify the telephone control device 11 via the internal communication line L of a call request message to the called extension number included in the message, with this extension number as the calling extension number. (Step 303).

In response to a call request message from the extension hub 13, the telephone control device 11 receives an incoming call from the virtual extension terminal corresponding to the external telephone terminal 20 to the extension terminal 12 corresponding to the called extension number included in the message. Is notified via the internal communication line L (step 304).
In response to the incoming call notification message from the telephone control device 11, the extension terminal 12 displays an incoming call to notify the incoming call (step 305).

When a response operation is performed at the extension terminal 12 according to the incoming call display (step 310), the extension terminal 12 notifies the telephone control device 11 of a response message to the incoming notification message via the internal communication line L. (Step 311).
In response to the response message from the extension terminal 12, the telephone control device 11 notifies the response message to the virtual extension terminal corresponding to the calling extension number included in the message, that is, the extension hub 13 (step 312). .

  In response to the response message from the telephone control device 11, the extension hub 13 identifies the external telephone terminal 20 corresponding to the calling extension number included in the message, and sends a response message to the external telephone terminal 20 as follows: The data is transmitted from the communication I / F unit to the external telephone terminal 20 via a link on the communication network 32 with the external telephone terminal 20 (step 313).

When the call control unit 23 of the external telephone terminal 20 receives a response message from the telephone system 10 via the network I / F unit 21, the call control unit 23 notifies the call processing unit 24 of the response message via the internal bus B ( Step 314).
Thus, the call processing unit 24 of the external telephone terminal 20 is connected via the link on the communication network 32 connected between the communication I / F unit of the extension hub 13 and the network I / F unit 21 of the external telephone terminal 20. Voice packet exchange is started with the extension terminal 12 of the telephone system 10, and VoIP notification is started (step 320).

Next, the operation of the telephone system 10 according to the present embodiment will be described with reference to FIG. FIG. 7 is a sequence diagram illustrating a transmission operation of the telephone system according to the third embodiment.
Here, a transmission operation when the external telephone terminal 20 is called from the extension terminal 12 of the telephone system 10 will be described.

In response to the extension call operation by the user (step 350), the extension terminal 12 of the telephone system 10 sends a call request message including the called extension number indicating the virtual extension terminal corresponding to the external telephone terminal 20 to the internal communication line L. Is notified to the telephone control device 11 (step 351).
In response to the call request message from the extension terminal 12, the telephone control device 11 notifies the corresponding virtual extension terminal, that is, the extension hub 13, of an incoming call notification message for the extension terminal of the called extension number included in the message ( Step 352).

  In response to the incoming notification message from the telephone control device 11, the extension hub 13 identifies the external telephone terminal 20 corresponding to the called extension number included in the message, and sends a call request message to the external telephone terminal 20 Is transmitted from the communication I / F unit to the external telephone terminal 20 via the link on the communication network 32 with the external telephone terminal 20 (step 353).

When the call control unit 23 of the external telephone terminal 20 receives the call request message from the telephone system 10 via the network I / F unit 21, the call control unit 23 sends an incoming call notification message corresponding to the call request message via the internal bus B. The call processor 24 is notified (step 354).
In response to the incoming notification message from the call control unit 23, the call processing unit 24 displays an incoming call to notify the extension incoming call (step 355).

When a response operation is performed on the external telephone terminal 20 in response to the incoming call display (step 360), the call processing unit 24 sends a response message to the incoming call notification message to the call control unit 23 via the internal bus B. Notification is made (step 361).
In response to the response message from the call processing unit 24, the call control unit 23 sends a response message to the extension terminal 12 of the calling party extension number included in the message via a link on the communication network 32 with the telephone system 10. Then, the data is transmitted from the network I / F unit 21 to the telephone system 10 (step 362).

  When the RD server 14 of the telephone system 10 receives the response message from the external telephone terminal 20 via the link on the communication network 32, the corresponding virtual extension terminal is based on the address of the external telephone terminal 20 acquired from the message. The telephone control device 11 is notified via the internal communication line L of a response message to the calling party extension number included in the message, with the extension number as the called extension number. Step 363).

In response to the response message from the extension hub 13, the telephone control device 11 sends a response from the virtual extension terminal corresponding to the external telephone terminal 20 to the extension terminal 12 corresponding to the calling extension number included in the message. A response message to be notified is notified through the internal communication line L (step 364).
Thus, the call processing unit 24 of the external telephone terminal 20 is connected via the link on the communication network 32 connected between the communication I / F unit of the extension hub 13 and the network I / F unit 21 of the external telephone terminal 20. Voice packet exchange is started with the extension terminal 12 of the telephone system 10 and VoIP notification is started (step 370).

[Effect of the third embodiment]
Thus, in the present embodiment, the external telephone terminal is connected to the extension hub 13 via the communication network 32 without using the remote connection based on the remote desktop function between the telephone system 10 and the external telephone terminal 20. 20 is provided with a data communication I / F unit for performing data communication with each of the virtual extension terminals, and is connected to each corresponding external telephone terminal 20 via the data communication I / F unit of the extension hub 13. Call control messages and voice packets are exchanged via a link.

  As a result, the extension hub 13 is provided in the telephone system 10 without requiring the RD server 14 or the RD client 22, and the external telephone terminal 20 is provided in the telephone system 10 only by providing the call control unit 23 in the external telephone terminal 20. Can be connected remotely. Thereby, the structure of the telephone system 10 and the external telephone terminal 20 can be simplified.

  In this embodiment, since the remote connection of the remote desktop function is not used, the security by the tunneling of the link cannot be used for the voice call, but general encryption is performed for the link formed in the communication network 32. By applying, high security can be obtained in a voice call and wiretapping can be prevented. Further, since a remote desktop function or the like is not applied as a link, services such as VPN can be easily applied.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 10 ... Telephone system, 11 ... Telephone control apparatus, 12 ... Extension terminal, 13 ... Extension hub, 14 ... RD server, 15 ... Router, 16 ... Data communication terminal, 20 ... External telephone terminal, 21 ... Network I / F part, 22 ... RD client, 23 ... call control unit, 24 ... call processing unit, 25 ... data communication processing unit, 31 ... telephone network, 32 ... communication network.

Claims (3)

A plurality of extension terminals having an IP telephone function;
A telephone control device for exchanging and connecting these extension terminals to the telephone network by exchanging call control messages with these extension terminals via an internal communication line, and interconnecting these extension terminals;
An RD server that performs data communication with the external telephone terminal by remotely connecting to the external telephone terminal having the IP telephone function based on the remote desktop function via the communication network;
A call control message connected to the internal communication line and exchanging the call control message with the telephone control device, and exchanging between the call control message and the external telephone terminal via the RD server. by relaying the door, and a extension hub connecting the external telephone terminal to a virtual internal terminals as the telephone controller,
The extension hub establishes in advance an individual IP session for each virtual extension terminal with the RD server via the internal communication line, and with the external telephone terminal via the RD server. When exchanging the call control message, the telephone system exchanges the call control message through an IP session corresponding to the virtual extension terminal of the external telephone terminal among the IP sessions . The telephone system according to claim 1, wherein
The extension hub exchanges voice packets with the extension terminals via the internal communication line, and also exchanges these voice packets and voice packets exchanged with the external telephone terminal via the RD server. By performing the relay processing, the voice call between the extension terminal and the external telephone terminal is realized , and the voice packet is exchanged with the external telephone terminal via the RD server. A telephone system, wherein the voice packet is exchanged through the IP session corresponding to a virtual extension terminal of an external telephone terminal . The telephone system according to claim 1 or 2,
The external telephone terminal is
An RD client that performs data communication with the extension hub by remotely connecting to the RD server of the telephone system via the communication network based on a remote desktop function;
A call processing unit having an IP telephone function, performing call control operation of the external telephone terminal based on a call control message, and performing a VoIP voice call based on a voice packet;
A telephone system comprising: a call control unit that relays a call control message from the call processing unit to the extension hub and relays a call control message from the extension hub to the call processing unit .

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