JP2008017518A - Signaling relay system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow communications between IP networks with different signaling methods by accommodating IP networks with different signaling methods and generating signaling messages appropriate for each IP network. <P>SOLUTION: The signaling relay system is connected between the IP network (one communication network) 2 and IP network (the other communication network) 3 with different signaling methods to terminate signaling messages of IP telephones (one communication terminals) a1-ak-an and IP telephones (the other communication terminals) b1-bk-bn and ensure their consistencies as well as actualizing communications between IP telephones connected to the IP networks with different signaling methods. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a signaling relay device that connects between communication networks having different signaling schemes or IP address systems and enables communication between communication terminals connected to each of the communication networks. The present invention relates to a signaling relay device that enables additional functions of hold / transfer, shaping, call waiting, and broadcast.

  As disclosed in “Patent Document 1” (signaling relay system and signaling relay method), a conventional signaling relay device is “a signaling relay system between communication terminal devices in a communication network to which a plurality of communication terminal devices are connected”. The signaling relay device and the data conversion device, the signaling relay device responding to the case where the capability mismatch between the calling terminal device and the receiving terminal device is detected during the session establishment request message relay, The capability information of each terminal device is notified to the data conversion device, and a session establishment request message in which the capability information of the transmission terminal device is converted into the capability information of the data conversion device is generated and transmitted to the reception terminal device. Information is changed to data converter capability information. Send to the originating communication terminal device generates a message, so as to establish a two-step sessions via the data conversion device. "Is intended.

  In addition, the conventional signaling relay device disclosed in “Patent Document 1” is “a data conversion device is an address conversion device, a signaling relay device is a SIP proxy server, and a data conversion device is a code of media data. It is a transcoder that converts the conversion method. "

According to this, by establishing a two-stage session, communication between communication terminal apparatuses having different IP address systems and the like can be enabled, and communication terminal apparatuses having different voice (media data) encoding methods can be used. Communication can be enabled.
JP 2003-152820 A

  The conventional signaling relay device disclosed in "Patent Document 1" can establish a session and perform communication between terminals having different capabilities without performing a signaling process in which the terminal is aware of the data conversion device, It achieves the task of "reducing the load on the terminal". In addition to relaying between communication terminals connected to communication networks (IP networks) with different signaling methods, hold / transfer, shaping, call waiting, broadcast It was not possible to provide additional functions such as.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a signaling relay device excellent in convenience capable of providing additional functions such as hold / transfer, shaping, call waiting, and broadcast. It is to provide.

  In order to solve the above problems, a signaling relay apparatus according to the present invention comprises a plurality of interface means for accommodating IP networks having different signaling methods, and a session establishment request message receiving means for receiving a session establishment request message from the first IP network. Extraction means for extracting information required for establishing a session to the second IP network from the session establishment request message, and a session establishment request for the second IP network based on the information extracted by the extraction means A session establishment request message generating means for generating a message; and a session establishment request message transmitting means for transmitting the session establishment request message generated by the session establishment request message generating means to a second IP network. And wherein the door.

  According to the present invention, a signaling relay apparatus for connecting between IP networks of different signaling systems includes a plurality of interface means for accommodating IP networks of different signaling systems, and a first terminal apparatus connected to the first IP network. Session establishment message receiving means for receiving a session establishment request message from the terminal, and extraction for extracting information necessary for session establishment to the second terminal device connected to the second IP network from the session establishment request message Means for generating a session establishment request message recognizable by a second terminal device connected to the second IP network based on the information extracted by the extraction means, and the session establishment request Generated by message generator The session establishment request message transmitting means for transmitting the session establishment request message to the second terminal device, and the session establishment request when the encoding methods of the first terminal device and the second terminal device are different. A media data processing unit configured to mutually convert an encoding method of data transmitted on the session between the first terminal device and the second terminal device, established by a message, .

  The signaling relay device according to the present invention includes additional function means for enabling the functions of holding / transferring between communication terminals, shaping of packets to be transmitted, call waiting, and broadcast broadcasting in addition to relaying signaling messages and media data Therefore, it is possible to realize additional functions such as hold / transfer, shaping, call waiting, and simultaneous broadcasting with only the relay device, and it is possible to improve convenience and usability.

  Further, the additional function means according to the present invention includes an interface connected to each of different communication networks, a signaling control unit that controls a signaling message, a media data control unit that controls media data, and a temporary storage of media data Media data buffer unit for editing, media data editing unit for editing media data, reserved sound source data unit for storing reserved sound source data, catch phone sound source data unit for storing call waiting sound source data, and destinations for simultaneous broadcasting A broadcast destination setting unit that stores data and a data transmission timing control unit that determines the transmission interval of media data, so that additional functions for hold / transfer, shaping, call waiting, and broadcast can be realized. The convenience of the signaling relay device. It can be Lumpur.

  Further, the additional function means according to the present invention is such that one communication terminal connected to one communication network and one communication network does not support the hold function, and is connected to the other communication network and the other communication network. The other communication terminal supports the hold function, and a hold request message is generated from the other communication terminal while a session is established between the other communication terminal and a call is established between the two communication terminals. Then, it can be configured to send a hold response message to the other communication terminal, discard the media data from one communication terminal, and send the hold sound source data from the hold sound source data section to one communication terminal. Can be realized even if one communication terminal connected to the other network and one communication terminal does not support the hold function. It is possible to realize the function.

  Further, the additional function means according to the present invention is such that one communication terminal connected to one communication network and one communication network does not support the transfer function, and is connected to the other communication network and the other communication network. The other communication terminal supports the transfer function, and when one of the communication terminals and the other communication terminal is on hold and a transfer request message is generated from the other communication terminal, a transfer response message is sent to the other communication terminal. In addition to transmitting, the suspended sound source data from the suspended sound source data section transmitted to one communication terminal is stopped to cancel the suspension, and the media data transmitted from one communication terminal to the other communication terminal is transferred to Can be configured to change the destination to the communication terminal specified in (1) and transmit the media data transmitted from the communication terminal specified as the transfer destination to one communication terminal. Transfer function can be realized even if one communication terminal connected to the other communication network and one communication network does not support the transfer function, and the transfer function can be easily realized with a simple configuration. .

  Furthermore, the additional function means according to the present invention provides a communication from another communication terminal connected to one communication network during a call between the two communication terminals after a session between the one communication terminal and the other communication terminal is established. When a session establishment request is generated in the other communication terminal, media data obtained by superimposing the sound source data from the call waiting sound source data unit in the media data editing unit on the media data from one communication terminal temporarily stored in the media data buffer unit. When a hold request message is generated from the other communication terminal after being transmitted to the other communication terminal, the hold sound source data from the hold sound source data section is transmitted to the one communication terminal and held, and the media from the other communication terminal is also received. The data destination is changed from one communication terminal to another communication terminal and transmitted, and media data from another communication terminal is transferred to the other communication terminal. Can be constructed to transmit to the terminal, can respond to the calling of the interrupt during a call, it is possible to easily realize a call waiting with a simple configuration.

  Further, the additional function means according to the present invention, when a session establishment request indicating simultaneous broadcasting is generated from one communication terminal by a special number or the like, a session establishment request is sent to a destination communication terminal preset in the broadcast destination setting unit. A message is transmitted to establish a session with each partner communication terminal, and media data from one communication terminal is temporarily stored in the media data buffer unit, and the media data editing unit stores the media data for the number of partner communication terminals. Since it can be configured to duplicate and transmit to the destination communication terminal, it is possible to broadcast to a plurality of preset communication terminals, realizing broadcast to any communication terminal without the need for a broadcasting device can do.

  Further, the additional function means according to the present invention temporarily stores media data transmitted from one communication terminal in a media data buffer unit when a session between one communication terminal and the other communication terminal is established. Since the data transmission timing control unit can be configured to adjust the transmission interval of the media data stored and transmit it, the media data transmission interval can be shaped within the guaranteed speed of the communication network to prevent packet loss. High-quality data without packet loss can be transmitted.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a system configuration diagram of an IP telephone system to which a signaling relay device according to the present invention is applied. In FIG. 1, an IP telephone system 1 is an IP telephone system based on VoIP (Voice over Internet Protocol), and includes an IP communication network (one communication network) 2, an IP communication network (the other communication network) 3, and an IP communication system. , An, and IP telephones (the other communication terminals) b1,..., Bk,..., An connected to the IP network 3. It is constructed from bn and a signaling relay device 4 connected between the IP communication network 2 and the IP communication network 3.

  , An, an IP communication network (one communication network) 2 and an IP telephone (one communication terminal) b1, an IP communication network (the other communication network) 3 and an IP telephone (the other communication terminal) b1. ,..., Bk,..., Bn are different in signaling method, IP address system, and the like.

  The signaling relay device 4 establishes a session between the IP telephones (one communication terminal) a1, ..., ak, ..., an and the IP telephones (the other communication terminal) b1, ..., bk, ..., bn. Thus, IP telephones (one communication terminal) a1,..., Ak,... Connected to an IP communication network (one communication network) 2 and an IP communication network (the other communication network) 3 having different signaling methods and IP address systems. , An and the IP telephone (the other communication terminal) b1,..., Bk,.

  The signaling relay device 4 holds / transfers and transmits IP telephones (one communication terminal) a1,..., Ak,..., And IP telephones (the other communication terminal) b1,. Additional function means 5 that enables packet shaping, call waiting, and broadcast broadcasting additional functions are provided, and holding / transfer, shaping, call waiting, and broadcast broadcasting can be added only by the signaling relay device 4 without the need for other devices. Realize the function.

  FIG. 2 is a block diagram showing the principal part of one embodiment of the additional function means according to the present invention. In FIG. 2, the additional function means 5 includes an interface (I / F) 6a, an interface (I / F) 6b, a signaling control unit 7a, a signaling control unit 7b, a media data control unit 8a, a media data control unit 8b, media data A buffer unit 9, a media data editing unit 10, a reserved sound source data unit 11, a call waiting sound source data unit 12, a simultaneous broadcast destination setting unit 13, a data transmission timing control unit 14a, and a data transmission timing control unit 14b are provided.

  The interface (I / F) 6a is connected to the IP communication network (one communication network) 2 and transmits / receives signaling messages and media data to / from IP telephones (one communication terminal) a1,..., Ak,. .

  The interface (I / F) 6b is connected to the IP communication network (the other communication network) 3 and transmits / receives signaling messages and media data to / from the IP telephones (the other communication terminals) b1, ..., bk, ..., bn. .

  The signaling controller 7a terminates the signaling message received via the interface (I / F) 6a, and performs control to transmit only information necessary for signaling relay such as a telephone number to the signaling controller 7b.

  The signaling controller 7b terminates a signaling message received via the interface (I / F) 6b, and performs control to transmit only information necessary for signaling relay such as a telephone number to the signaling controller 7a.

  The media data control unit 8a terminates the media data received via the interface (I / F) 6a, extracts only the encoded data portion of the audio and stores it in the media data buffer unit 9, The voice data stored in the data buffer unit 9 and the reserved sound source data unit 11 and the encoded data portion of the holding tone are read out and transmitted as media data via the interface (I / F) 6a.

  The media data control unit 8b terminates the media data received via the interface (I / F) 6b, extracts only the encoded data portion of the audio and stores it in the media data buffer unit 9, Control is performed to read the encoded data portion of the voice and the hold sound stored in the data buffer unit 9 and the reserved sound source data unit 11 and transmit it as media data via the interface (I / F) 6b.

  The media data buffer unit 9 temporarily stores a coded data portion of audio supplied from the media data control unit 8a and the media data control unit 8b.

  The media data editing unit 10 edits the encoded data portion of the audio stored in the media data buffer unit 9, edits the audio data having a different encoding method, and stores it in the call waiting sound source data unit 12. Control to add the sound source and audio data.

  The on-hold sound source data unit 11 stores sound source data for transmitting a sound indicating that the session is on hold to the IP telephone (communication terminal) on which the session is on hold when the hold function is realized.

  The call waiting sound source data unit 12 generates sound source data for sending a sound indicating that there is an IP telephone (communication terminal) requesting establishment of a new session to an IP telephone (communication terminal) for which a session has already been established. Store.

  The broadcast destination setting unit 13 presets and stores the destination telephone number of the broadcast when performing the broadcast.

  The data transmission timing control unit 14a determines the transmission interval of the signaling message and the media data so that the interface (I / F) 6a can shape and send the traffic to the IP communication network (one communication network) 2. Then, the timing of sending out is controlled.

  The data transmission timing control unit 14b determines the transmission interval of signaling messages and media data so that the interface (I / F) 6b can shape and send traffic to the IP communication network (the other communication network) 3. Then, the timing of sending out is controlled.

  As described above, the additional function means 5 according to the present invention includes the interface (interface (I / F) 6a, interface (I / F)) connected to each of different communication networks (IP communication network 2 and IP communication network 3). 6b), a signaling control unit (signaling control unit 7a, signaling control unit 7b) for controlling signaling messages, a media data control unit (media data control unit 8a, media data control unit 8b) for controlling media data, media A media data buffer unit 9 for temporarily storing data, a media data editing unit 10 for editing media data, a reserved sound source data unit 11 for storing reserved sound source data, a catch phone sound source data unit 12 for storing call waiting sound source data, Set up a broadcast destination to store and set the destination for the broadcast Unit 13 and a data transmission timing control unit (data transmission timing control unit 14a, data transmission timing control unit 14b) for determining the transmission interval of media data, so that holding / transfer, shaping, call waiting, and simultaneous broadcasting are added. The function can be realized and the convenience of the signaling relay device 4 can be appealed.

  Next, a description will be given of a control sequence of call, hold / transfer, call waiting, simultaneous broadcasting, and shaping of the additional function means 5. FIG. 3 is a call control sequence diagram of the additional function means according to the present invention. A call can be made between the IP telephone (one communication terminal) a1 of the IP communication network (one communication network) 2 and the IP telephone (the other communication terminal) b1 of the IP communication network (the other communication network) 3. The control sequence will be described. In this case, an IP telephone (one communication terminal) a1 and an IP telephone connected to an IP communication network (one communication network) 2 and an IP communication network (the other communication network) 3 having different signaling methods and IP address systems, etc. Since the call is between the other communication terminal b1, a direct session cannot be established, and a session is established via the signaling relay device 4.

  In FIG. 3, since the interface (I / F) 6a is visible to the IP telephone (one communication terminal) b1 when viewed from the IP telephone (one communication terminal) a1, the IP telephone (one communication terminal) a1 (I / F) A session establishment request message is transmitted to 6a.

  When the interface (I / F) 6a receives the session establishment request message from the IP telephone (one communication terminal) a1, the interface (I / F) 6a extracts the other party telephone number in the session establishment request message, and the IP communication network (the other communication network) A session establishment request message is transmitted from the interface (I / F) 6b to the IP telephone (the other communication terminal) b1 using a recognizable signaling protocol of the IP telephone (the other communication terminal) b1 connected to 3.

  When the interface (I / F) 6b receives a session establishment response message from the IP telephone (the other communication terminal) b1, the interface (I / F) 6b establishes a session with the IP telephone (the other communication terminal) b1, (One communication terminal) A session establishment response message is transmitted from the interface (I / F) 6a to the IP telephone (one communication terminal) a1 using the recognizable signaling protocol of a1.

  When the interface (I / F) 6a receives a session response confirmation message from the IP telephone (one communication terminal) a1, the interface (I / F) 6a establishes a session with the IP telephone (one communication terminal) a1.

  In the session establishment process, the interface (I / F) 6a and the interface (I / F) 6b extract only the other party telephone number and the like required for session establishment, newly generate a signaling message and relay it. For example, SIP (Session Initiation Protocol) and H.264. It is possible to establish a session between IP telephones (communication terminals) connected between communication networks having different signaling schemes such as H.323 or between communication networks having different IP address systems such as IP version 4 and IP version 6.

  The interface (I / F) 6a terminates media data transmitted over a session established by signaling with the IP telephone (one communication terminal) a1, and only the encoded data portion of the voice. And is transmitted to the IP telephone (the other communication terminal) b1 as media data that can be reproduced by the IP telephone (the other communication terminal) b1.

  The interface (I / F) 6b terminates the media data transmitted over the session established by signaling with the IP telephone (the other communication terminal) b1, and extracts only the encoded data portion of the voice. The IP telephone (one communication terminal) a1 transmits the media data that can be reproduced to the IP telephone (one communication terminal) a1.

  In the media data processing, the interface (I / F) 6a and the interface (I / F) 6b extract only the encoded data portion of the audio included in the media data, and generate and relay new media data. Therefore, for example, the audio encoding method is H.264. 729 and G.G. Calls (communications) between different IP telephones (communication terminals) such as 711 are possible.

  FIG. 4 is a control sequence diagram showing one embodiment of hold / transfer of the additional function means according to the present invention. The interface (I / F) 6a and the IP telephone (one communication terminal) a1 do not support the hold / transfer function, and the interface (I / F) 6b and the IP telephone (the other communication terminal) b1 are on hold. The transfer function is supported, and the IP telephone (one communication terminal) a1 and the IP telephone (the other communication terminal) b1 are put on hold from the IP telephone (the other communication terminal) b1 side and the IP telephone ( A case where data is transferred to one communication terminal ak will be described.

  4, until the IP telephone (one communication terminal) a1 and the IP telephone (the other communication terminal) b1 establish a session and make a call (communication), the control sequence is the same as in FIG. When the IP telephone (the other communication terminal) b1 transmits a hold request message to the interface (I / F) 6b, the interface (I / F) 6b terminates the hold request message, and the IP telephone (the other communication terminal) A hold response message is transmitted to b1.

  At this point, since the media data from the IP telephone (one communication terminal) a1 received by the interface (I / F) 6a is recognized as being unnecessary due to the hold, the media data is discarded. Is done. Thereby, unnecessary traffic can be reduced.

  In the hold state, the IP phone (the other communication terminal) b1 stops the media data to the IP phone (the one communication terminal) a1, and the IP phone (the one communication terminal) a1 enters the silent state, so the hold By transmitting the reserved sound source data stored in the sound source data unit 11 from the interface (I / F) 6a as media data to the IP telephone (one communication terminal) a1, an IP communication network that does not support the hold function ( Hold between one communication network) 2 and the IP telephone (one communication terminal) a1 and the IP communication network (the other communication network) 3 and the IP telephone (the other communication terminal) b1 that support the hold function. Functions can be realized.

  Note that voice and music-on-hold media data is usually transmitted by RTP (Real-time Transport Protocol) protocol. In the protocol header used in this RTP protocol, a sequence number that is incremented by 1 every time a packet is generated and a time stamp that is incremented by 1 at a constant period are given.

  When switching between voice media data and music on hold media data, if the media data is not generated while taking over these orders, the order of the media data is greatly impaired at the communication terminal, and a large fluctuation occurs. In other words, when the voice is restored, it causes noise and voice interruption.

  In the present invention, only the audio data portion included in the media data is extracted, and new media data is generated and relayed. Therefore, even when switching between the audio media data and the music on hold media data, the sequence number and time The stamp is continued, and noise and voice breaks can be easily prevented when the voice is restored.

  Subsequently, the IP telephone (one communication terminal) a1 and the IP telephone (the other communication terminal) b1 are put on hold, and the IP telephone (the other communication terminal) b1 is transferred to the IP telephone (the other communication terminal) bk. A case where the media data of (one communication terminal) a1 is transferred will be described. The IP telephone (the other communication terminal) bk supports the transfer function.

  In FIG. 4, when a session establishment request message of the IP telephone (the other communication terminal) bk designated as the transfer destination is transmitted from the IP telephone (the other communication terminal) b1 to the interface (I / F) 6b, the interface (I / F) F) 6b terminates the received session establishment request message, extracts a destination telephone number (in this case, IP telephone bk) from the session establishment request message, and sends a session establishment request message from the extracted destination telephone number. Transmit to the IP telephone (the other communication terminal) bk.

  When the interface (I / F) 6b receives the session establishment response message from the IP telephone (the other communication terminal) bk, the interface (I / F) 6b transmits the session establishment response message to the IP telephone (the other communication terminal) b1, and the IP telephone (the other communication terminal) bk A session is established between the communication terminal b1 and the IP telephone (the other communication terminal) bk.

  Media data transmitted and received after the session is established is extracted and relayed only by the encoded portion of the voice, and the IP telephone (the other communication terminal) b1 and the IP telephone (the other communication terminal) bk Realize communication (communication) between.

  From the telephone (communication) state between the IP telephone (the other communication terminal) b1 and the IP telephone (the other communication terminal) bk, a transfer request message is sent from the IP telephone (the other communication terminal) bk to the interface (I / F) 6b. When transmitted, the interface (I / F) 6b terminates the transfer request message, transmits the transfer response message to the IP telephone (the other communication terminal) b1, and also sends the IP telephone (one of the telephones) from the reserved sound source data unit 11. The suspension is canceled by stopping the suspended sound source data transmitted to the communication terminal a1.

  Further, the interface (I / F) 6b is configured to send the destination of the media data transmitted from the IP telephone (one communication terminal) a1 via the interface (I / F) 6a after the hold is released to the IP telephone (the other telephone). The communication terminal is changed from b1 to the IP telephone (the other communication terminal) bk, and the media data whose destination is changed is transmitted to the IP telephone (the other communication terminal) bk.

  Further, the interface (I / F) 6b transmits the media data transmitted from the IP telephone (other communication terminal) bk to the IP telephone (one communication terminal) a1 via the interface (I / F) 6a. .

  A transfer function can be realized by such processing. Note that the transfer process is simply a process in which a normal session is established in the IP telephone (the other communication terminal) bk, so that the transfer destination is connected to the interface (I / F) 6a that does not support the transfer function. The IP telephone (one communication terminal) a2,..., Ak,.

  As described above, the additional function means 5 according to the present invention includes one communication network (IP communication network 2) and one communication terminal (IP telephones a1, ..., ak, ..., an) connected to the one communication network. Does not support the hold function, and the other communication network (IP communication network 3) and the other communication terminal (IP telephones b1,..., Bk,..., Bn) connected to the other communication network have the hold function. The other communication terminal (IP telephone b1) and the other communication terminal (IP telephone b1) establish a session and the other communication terminal (IP telephone a1-IP telephone b1) is talking on the other side. When a hold request message is generated from one communication terminal (IP telephone b1), a hold response message is transmitted to the other communication terminal (IP telephone b1), and media data from one communication terminal (IP telephone a1) is transmitted. And the reserved sound source data section 11 transmits the reserved sound source data to one communication terminal (IP telephone a1), so that one communication terminal connected to one communication network and one communication network supports the hold function. Even if it is not, the hold function can be realized, and the hold function can be easily realized with a simple configuration.

  Further, the additional function means 5 according to the present invention transfers one communication network (IP communication network 2) and one communication terminal (IP telephones a1, ..., ak, ..., an) connected to the one communication network. The function is not supported, and the other communication network (IP communication network 3) and the other communication terminal (IP telephones b1, ..., bk, ..., bn) connected to the other communication network support the transfer function. When a transfer request message is generated from the other communication terminal (IP telephone b1) while one communication terminal (IP telephone a1) and the other communication terminal (IP telephone b1) are on hold, the other communication terminal (IP telephone a1) The transfer response message is transmitted to the telephone set b1), and the on-hold sound source data from the on-hold sound source data section 11 transmitted to one communication terminal (IP telephone a1) is stopped to release the hold, and the one communication terminal ( The media data transmitted from the P telephone a1) to the other communication terminal (IP telephone b1) is transmitted to the communication terminal (IP telephone bk) designated as the transfer destination with the destination changed and designated as the transfer destination. Since the media data transmitted from the communication terminal (IP telephone bk) is transmitted to one communication terminal (IP telephone a1), one communication network (IP communication network 2) and one communication connected to one communication network are transmitted. Even if the terminals (IP telephones a1,..., Ak,..., An) do not support the transfer function, the transfer function can be realized, and the transfer function can be easily realized with a simple configuration.

  FIG. 5 is a control sequence diagram of an embodiment of the catch phone of the additional function means according to the present invention. An IP telephone (one communication terminal) a1 connected to the IP communication network (one communication network) 2 and an IP telephone (the other communication terminal) b1 connected to the IP communication network (the other communication network) 3 The IP telephone (one communication terminal) ak is connected to the IP communication network (one communication network) 2 during a call (during communication) between the IP telephone a1 and the IP telephone b1. A case where a new session establishment request is generated in the telephone set (the other communication terminal) b1 will be described.

  In FIG. 5, when the interface (I / F) 6a receives a session establishment request message from the IP telephone (one communication terminal) ak, the interface (I / F) 6a transmits a session request confirmation message to the IP telephone (one communication terminal) ak. The media data in which the IP telephone (one communication terminal) a1 transmits to the IP telephone (the other communication terminal) b1 is superimposed with a sound indicating that there is an IP telephone ak requesting establishment of a new session. The data is transmitted from the communication network (the other communication network) 3 to the IP telephone (the other communication terminal) b1. The media data on which the call waiting sound is superimposed extracts only the encoded data portion of the voice from the media data transmitted from the IP telephone (one communication terminal) a1 and temporarily stores it in the media data buffer unit 9. Then, the temporarily stored data portion and the call waiting sound source data stored in the call waiting sound source data unit 12 are added and edited by the media data editing unit 10 and then generated as new media data.

  The IP telephone (the other communication terminal) b1 that has listened to the media data on which the call waiting sound source is superimposed responds to the IP telephone (one communication terminal) ak requesting the establishment of a new session with an interface (I / F) Send to 6b.

  When the interface (I / F) 6b receives the hold request message from the IP phone b1, the interface (I / F) 6b transmits a hold response message to the IP phone b1, and reads the hold sound data from the hold sound source data unit 11 to interface (I / F) It transmits to IP telephone a1 via 6a.

  Subsequently, the interface (I / F) 6a transmits a session establishment response message to the IP telephone ak to establish a session between the IP telephone ak and the interface (I / F) 6a.

  From this point, the interface (I / F) 6a changes the destination of the media data transmitted from the IP telephone (the other communication terminal) b1 to the IP telephone (the one communication terminal) a1, and changes the IP telephone (one of the communication terminals) a1. By transmitting the media data transmitted from the IP telephone (one communication terminal) ak to the IP telephone (the other communication terminal) b1 via the interface (I / F) 6b. The telephone call state between the IP telephone b1 and the IP telephone a1 can be switched to the telephone conversation state between the IP telephone b1 and the IP telephone ak, and a call waiting function can be realized.

  As described above, the additional function means 5 according to the present invention establishes a session between one communication terminal (IP telephone a1) and the other communication terminal (IP telephone b1) and establishes a communication between the two communication terminals (IP telephone a1-IP). When a session establishment request occurs from another communication terminal (IP telephone ak) connected to one communication network (IP communication network 2) to the other communication terminal (IP telephone b1) during a call between the telephones b1) The media data obtained by superimposing the sound source data from the call waiting sound source data unit 12 in the media data editing unit 10 on the media data from another communication terminal (IP telephone ak) temporarily stored in the media data buffer unit 9 is used as the other communication terminal. After transmission to (IP telephone b1), when a hold request message is generated from the other communication terminal (IP telephone b1), one communication terminal (IP telephone) a1) transmits the on-hold sound source data from the on-hold sound source data unit 11 and holds the same, and the destination of the media data from the other communication terminal (IP telephone b1) is sent from one communication terminal (IP telephone a1) to another communication. Since the data is changed to the terminal (IP telephone ak) and transmitted, and the media data from another communication terminal (IP telephone ak) is transmitted to the other communication terminal (IP telephone b1), It is possible to respond, and the call waiting function can be easily realized with a simple configuration.

  FIG. 6 is a control sequence diagram of an embodiment of simultaneous broadcasting of additional function means according to the present invention. An IP telephone (the other communication terminal) b1 connected from the IP telephone (the one communication terminal) a1 connected to the IP communication network (the one communication network) 2 to the IP communication network (the other communication network) 3; A case of broadcasting to IP phone (the other communication terminal) bk will be described.

  In FIG. 6, when a session establishment request message indicating simultaneous broadcasting is generated from the IP telephone (one communication terminal) a 1 using a special number or the like, the interface (I / F) 6 a is preset in the simultaneous broadcast destination setting unit 13. A broadcast destination telephone number (in this case, IP telephones b1 and bk) is detected and a session establishment request message is transmitted to the IP telephone (one communication terminal) a1, and the interface (I / F) 6b is an IP telephone. A session establishment request message is transmitted to (the other communication terminal) b1 and the IP telephone (the other communication terminal) bk.

  The interface (I / F) 6b receives a session establishment response message from the IP telephone (the other communication terminal) b1, and establishes a session with the IP telephone (the other communication terminal) b1.

  Subsequently, the interface (I / F) 6b receives a session establishment response message from the IP telephone (the other communication terminal) bk and establishes a session with the IP telephone (the other communication terminal) bk. Similarly, when there are a plurality of broadcast broadcast partners, a session is established with the broadcast broadcast partner.

  When the establishment of the session between the interface (I / F) 6b and the IP telephone b1 and the IP telephone bk is completed, a session establishment response message is sent from the interface (I / F) 6a to the IP telephone (one communication terminal) a1. To establish a session between the interface (I / F) 6a and the IP telephone a1.

  When the session is established and the media data for simultaneous broadcasting is transmitted from the IP telephone (one communication terminal) a1 to the interface (I / F) 6a, the interface (I / F) 6a terminates the media data and receives the voice. Are extracted and temporarily stored in the media data buffer unit 9, and then the media data editing unit 10 duplicates the broadcast broadcast audio for the IP telephone set b1 and the IP telephone set bk, and the interface ( I / F) The voice media data copied from 6b is transmitted to IP telephone set b1 and IP telephone set bk.

  In the case of broadcast, it is assumed that IP telephone b1 and IP telephone bk that receive broadcast media data normally do not transmit media data, but there is media data transmission from IP telephone b1 and IP telephone bk. Also, unnecessary traffic is reduced by discarding media data received from the IP telephone set b1 and the IP telephone set bk at the interface (I / F) 6b.

  The broadcasting terminals may be any IP telephones such as IP telephones a1, ..., ak, ..., an and IP telephones b1, ..., bk, ..., bn. .., An and IP telephones b1,..., Bk,.

  In this way, the additional function means 5 according to the present invention, when a session establishment request indicating simultaneous broadcast is generated from one communication terminal (IP telephone a1) by a special number or the like, the other party preset in the simultaneous broadcast destination setting unit A session establishment request message is transmitted to the other communication terminals (IP telephone b1 and IP telephone bk) to establish a session with each other communication terminal, and media data from one communication terminal (IP telephone a1) is stored in the media data buffer. The data is temporarily stored in the unit 9, and the media data editing unit 10 copies the media data by the number of the partner communication terminals (IP telephone b1, IP telephone bk) and transmits them to the partner communication terminals (IP telephone b1 and IP telephone bk). Therefore, it is possible to broadcast to a plurality of preset communication terminals, and a broadcasting device is required. Without it is possible to realize a simultaneous broadcast to any communication terminal.

  Next, the shaping function according to the present invention will be described. , An, an IP communication network (one communication network) 2, an IP communication network (one communication network) 2, and an IP telephone system (one communication terminal) a1,. Signaling relay device 4, signaling relay device 4 and IP communication network (the other communication network) 3, IP communication network (the other communication network) 3 and IP telephones (the other communication terminals) b1,..., Bk,. For the mutual connection, it is assumed that an Ethernet (registered trademark) dedicated line is used as an access line.

  The Ethernet (registered trademark) leased line service is provided by a user interface such as 10BASE-T or 100BASE-TX, and is, for example, a speed such as 1 Mbit / s with respect to a physical maximum speed such as 10 Mbit / s or 100 Mbit / s. If it is up to, the guaranteed speed at which the transmitted packet can be transmitted without being discarded within the line is specified and the service is provided.

  The guaranteed rate specified here cannot necessarily absorb burst traffic. For example, even if the average packet traffic transmitted in one second is transmitted within the guaranteed speed, the guaranteed speed of the line is defined as the average traffic transmitted in 100 milliseconds. In some cases, the guaranteed speed is exceeded and packets are discarded. For this reason, it is necessary to control the shaping so as not to exceed the guaranteed rate by adjusting the transmission interval for each packet.

  The additional function means 5 includes an IP telephone (one communication terminal) a1, ..., ak, ..., an connected to an IP communication network (one communication network) 2, and an IP communication network (the other communication network) 3. , Bk,..., Bn are connected to the IP telephone (the other communication terminal) b1,. , Ak,..., An and IP telephones (the other communication terminal) b1,..., Bk,. Packet discard cannot be prevented.

  The shaping of the present invention is transmitted from the IP telephones (one communication terminal) a1, ..., ak, ..., an connected to the IP communication network (one communication network) 2 in the additional function means 5 shown in FIG. The interface (I / F) 6a receives incoming media data, temporarily stores the media data in the media data buffer unit 9, and stores the stored media data from the interface (I / F) 6b to the IP communication network (the other communication network). ) 3, the data transmission timing control unit 14 b calculates the transmission interval from the guaranteed speed of the line of the IP communication network (the other communication network) 3, and the media data is transferred to the IP communication network (the other Communication network 3). Note that the calculation is performed by transmission interval (s) ≧ bit number of transmission data (bit) / guaranteed line speed (bit / s)

  Similarly, the media data transmitted from the IP telephones (the other communication terminals) b1,..., Bk,..., Bn connected to the IP communication network (the other communication network) 3 is received by the interface (I / F) 6b. A data transmission timing control unit for receiving and temporarily storing media data in the media data buffer unit 9 and transmitting the stored media data from the interface (I / F) 6a to the IP communication network (one communication network) 2. 14 a calculates the transmission interval from the guaranteed speed of the line of the IP communication network (one communication network) 2, and transmits the media data to the IP communication network (one communication network) 2 at the calculated transmission interval.

  As described above, the additional function means 5 according to the present invention includes the communication terminals (IP telephones a1, ..., ak, ..., an) and the other communication terminals (IP telephones b1, ..., bk, ..., bn). When the session is established, media data transmitted from one communication terminal is temporarily stored in the media data buffer unit 9, and the transmission interval of the media data stored in the data transmission timing control unit 14b is adjusted and transmitted. Therefore, the transmission interval of media data can be shaped within the guaranteed speed of the communication network (IP communication network 3) to prevent packet loss, and high-quality data without packet loss can be transmitted.

  As described above, the signaling relay device 4 according to the present invention enables holding / transfer between communication terminals, shaping of packets to be transmitted, call waiting, and additional functions of broadcast broadcasting in addition to the relay of signaling messages and media data. Since the additional function means 5 is provided, it is possible to realize the additional functions of hold / transfer, shaping, call waiting, and simultaneous broadcasting only by the relay device, and it is possible to improve convenience and usability.

  The signaling relay device according to the present invention enables not only the relay of signaling messages and media data, but also a holding / transfer between communication terminals, shaping of a packet to be transmitted, call waiting, and a convenient function for high convenience broadcasting. In addition, the present invention can be applied to any signaling relay device that enables communication by relaying media data between communication terminals connected between communication networks having different signaling methods and IP address systems.

System configuration diagram of an IP telephone system to which a signaling relay device according to the present invention is applied Block diagram of main part of one embodiment of additional function means according to the present invention Communication sequence diagram of additional function means according to the present invention Control sequence diagram of one embodiment of hold / transfer of additional function means according to the present invention Control sequence diagram of one embodiment of call waiting of additional function means according to the present invention Control sequence diagram of one embodiment of simultaneous broadcasting of additional function means according to the present invention

Explanation of symbols

1 IP telephone system 2 IP communication network (one communication network)
3 IP communication network (the other communication network)
4 Signaling relay device 5 Additional function means 6a, 6b Interface (I / F)
7a, 7b Signaling control unit 8a, 8b Media data control unit 9 Media data buffer unit 10 Media data editing unit 11 On-hold sound source data unit 12 Call waiting sound source data unit 13 Broadcast destination setting unit 14a, 14b Data transmission timing control unit a1, ..., ak, ..., an IP telephone (one communication terminal)
b1, ..., bk, ..., bn IP telephone (the other communication terminal)

Claims (2)

A plurality of interface means for accommodating IP networks of different signaling methods;
Session establishment request message receiving means for receiving a session establishment request message from the first IP network;
Extraction means for extracting information required for establishing a session to the second IP network from the session establishment request message;
Session establishment request message generation means for generating a session establishment request message for the second IP network based on the information extracted by the extraction means;
Session establishment request message transmission means for transmitting the session establishment request message generated by the session establishment request message generation means to the second IP network;
A signaling relay device for connecting between IP networks having different signaling schemes. A plurality of interface means for accommodating IP networks of different signaling methods;
Session establishment message receiving means for receiving a session establishment request message from a first terminal device connected to the first IP network;
Extraction means for extracting information required for establishing a session to the second terminal device connected to the second IP network from the session establishment request message;
Session establishment request message generating means for generating a session establishment request message recognizable by the second terminal device connected to the second IP network based on the information extracted by the extracting means;
Session establishment request message transmission means for transmitting the session establishment request message generated by the session establishment request message generation means to the second terminal device;
When the encoding methods of the first terminal device and the second terminal device are different, the session established between the first terminal device and the second terminal device is established by the session establishment request message. A media data processing unit for mutually converting the encoding method of transmitted data;
A signaling relay device for connecting between IP networks having different signaling schemes.

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