CN100455009C - A Method for Voice Channel Backup of Video Conference System - Google Patents

Abstract

A method for voice channel backup of a video conference system of the present invention comprises the following steps: adding a PSTN telephone interface device to a video conference terminal for connecting the voice of the video conference terminal to the PSTN network; in the video conference system One or more PSTN interface devices are added to the multi-point control unit for accessing the PSTN voice of the multi-channel video conference terminal; if the communication network fails to connect, the video conference terminal actively calls the multi-point control unit to initiate a connection; Or the multi-point control unit automatically initiates a PSTN call to the video conference terminal, and adds PSTN voice into the conference for voice channel backup. The method of the invention realizes the backup of voice channels in one or more video conference terminals, and can ensure the normal progress of the voice conference.

Description

A Method for Voice Channel Backup of Video Conference System

technical field

The invention relates to the field of video conference in communication technology, in particular to a method for backing up a voice channel by using a PSTN interface device in a video conference system.

Background technique

In the current communication field, video conference systems are more and more widely used, and people can conduct video and voice communication through the communication network. However, the communication network may fail, especially the IP communication network does not guarantee the communication quality. When the network is congested and the packet loss rate is high, there will be problems in the video and voice communication of the conference TV system, which will lead to communication interruption in severe cases. Unable to connect to the meeting normally.

The PSTN phone in the public telephone switching network is still a reliable voice communication tool that is commonly used at present. Therefore, when the communication network fails, it is very meaningful if the PSTN phone can be quickly added to the meeting as a backup of the voice channel to ensure the normal progress of the meeting. major.

The current conference TV mainly has the following two solutions:

1. Conference TV terminal with built-in PSTN telephone device.

2. The PSTN telephone terminal is connected to the IP conference TV system through the voice gateway.

In the existing technology, no matter which of the above-mentioned implementation schemes, there are some defects:

For video conferencing terminals with built-in PSTN telephone devices, it is not possible to actively connect PSTN telephones when the communication network fails, and when the network fails, only point-to-point video conference terminals can be connected to PSTN telephones.

For the PSTN telephone terminal to access the IP video conference system through the voice gateway, the PSTN telephone terminal and the IP video conference terminal are two independent systems, and the PSTN telephone voice needs to be converted into IP data packets before it can communicate with the IP video conference terminal. When the IP communication network fails, the PSTN telephone terminal may not be able to intercommunicate with the IP conference video terminal, so the access of the PSTN telephone cannot be realized.

Contents of the invention

The purpose of the present invention is to provide a method for voice channel backup of a video conference system. The video conference system uses a PSTN interface device for voice channel backup. The terminal initiates a PSTN telephone call, so as to solve the above-mentioned problems in the prior art. When the network fails, one or more conference TV terminals can access the conference through the PSTN network in time to ensure the normal progress of the voice conference.

Technical scheme of the present invention comprises:

A method for voice channel backup of a video conferencing system, comprising the following steps:

a: Add a PSTN telephone interface device in the video conference terminal to connect the voice of the video conference terminal to the PSTN network;

b: Add one or more PSTN interface devices to the multi-point control unit in the video conference system to access the PSTN voice of the multi-channel video conference terminal;

c: The videoconferencing terminal actively calls the multipoint control unit to initiate a connection. If the communication network fails and the connection fails, the videoconferencing terminal automatically initiates a PSTN call to the multipoint control unit, and adds PSTN voice to the conference for voice Channel backup.

The method described above, wherein, the method further includes: in the step c, if the communication network is normal and the videoconferencing terminal and the multi-point control unit can be connected, then during the connection process, perform PSTN connection Incoming capability and PSTN access number capability exchange.

The method, wherein, the PSTN voice channel backup in the conference process in the step c also includes the following steps:

A) the multipoint control unit monitors the packet loss rate of each video conference terminal communication network in real time;

B) When monitoring that the network packet loss rate of a certain video conference terminal rises to a set value, the multipoint control unit initiates a PSTN telephone call to the video conference terminal;

C) After receiving the PSTN telephone call, the video conference terminal automatically answers and accesses;

D) The multipoint control unit mixes the PSTN voice of the video conference terminal, and transmits the conference voice to the video conference terminal through the PSTN, so as to ensure its normal voice conference.

The method, wherein, the PSTN voice channel backup in the conference process in the step c also includes the following steps:

E) The multi-point control unit monitors the packet loss rate of each video conference terminal communication network in real time;

F) When detecting that the network packet loss rate of the video conference terminal drops to a preset value, the multipoint control unit automatically hangs up the PSTN connection of the video conference terminal.

The method described above, wherein the set value is 50%, and the preset value is 10%.

A method for voice channel backup of a video conference system provided by the present invention, since a PSTN telephone interface device is used in the video conference terminal and the MCU multipoint control unit, the network communication status is automatically monitored during the conference, and when packet loss in the network is detected When the rate rises to the situation that affects the video and voice communication, the video conference system will automatically initiate a call connection through the PSTN telephone interface device, and connect the PSTN voice to the conference. Specifically, the terminal can directly initiate a PSTN telephone call to the MCU; The IP video conferencing terminal initiates a PSTN telephone call, thereby realizing the backup of voice channels in one or more video conferencing terminals, so as to ensure the normal progress of the voice conference.

Description of drawings

Fig. 1 is the system networking schematic diagram that the inventive method adopts;

Fig. 2 is a schematic diagram of the PSTN telephone access process of the multi-point conference IP video conferencing terminal according to the method of the present invention.

Detailed ways

Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The method for voice channel backup of the video conferencing system of the present invention mainly includes:

A PSTN telephone interface device is added to the video conference terminal, through which the voice of the video conference terminal can be connected to the PSTN network. A multi-channel PSTN interface device is added to the multi-point control unit MCU in the video conference system to access the PSTN voice of the multi-channel video conference terminal.

In the method of the present invention, the video conference terminal actively calls the MCU to initiate a connection. If the connection fails due to a communication network failure, the video conference terminal will automatically initiate a PSTN call to the MCU to add PSTN voice to the conference for voice channel backup. The method of the present invention can also automatically initiate a PSTN call to the MCU by the video conference terminal when the communication network fails, without pre-judging whether the communication network has a failure.

If the communication network is normal and the videoconferencing terminal and MCU can be connected, then during the connection process, a capability exchange including PSTN access capability and PSTN access number is performed. The PSTN voice channel backup in the conference process comprises the steps:

A) the MCU monitors the packet loss rate of each terminal communication network in real time;

B) when the network packet loss rate of a certain terminal is monitored to rise to a set value, the MCU initiates a PSTN telephone call to the terminal;

C) After the terminal receives the PSTN telephone call, it automatically answers and accesses;

D) The MCU performs mixing processing on the PSTN voice of the terminal, and transmits the voice of the conference to the terminal through the PSTN, so as to ensure the normal voice conference of the terminal;

E) the MCU monitors the packet loss rate of each terminal communication network in real time;

F) When detecting that the network packet loss rate of the terminal drops to a certain set value, the MCU automatically hangs up the PSTN connection of the terminal.

As shown in Figure 1, it is a schematic diagram of the system networking adopted by the method of the present invention, wherein both the videoconferencing terminal and the MCU support the PSTN telephone interface, and during a normal meeting, the videoconferencing terminal carries out video and voice communication through the video voice communication network, When some conference TV terminals cannot communicate normally due to network quality problems, the PSTN phone of the terminal can be connected to the conference to back up the voice channel to ensure the normal progress of the voice conference.

The specific processing flow of PSTN telephone access for voice backup in the method of the present invention will be described in detail below for the multipoint IP conference system.

As shown in Figure 2, when an IP video conferencing terminal joins a multi-point video conference system for a normal meeting, it first initiates a call to the MCU, and can directly call the IP address or access number of the MCU. If the response indicates that the IP network may be faulty and cannot be used for communication, then the terminal may directly initiate a PSTN telephone call to the MCU, or the MCU may automatically initiate a PSTN telephone call to the IP conference television terminal. If the MCU can receive the call, it will analyze the received IP address or access number to determine whether the IP video conference terminal is allowed to join the conference, and if it is allowed to join the conference, send an access token to the IP conference TV terminal , otherwise hang up the call.

The IP video conferencing terminal initiates a PSTN telephone call to the MCU. After the MCU receives the call, it checks the caller number and the PSTN interface resources of the MCU. If the number is allowed to intervene and the PSTN interface of the MCU has free resources, the MCU automatically transfers the IP The PSTN voice of the videoconferencing terminal is connected to the conference, otherwise the PSTN call is hung up.

After receiving the access token from the MCU, the IP conference TV terminal processes the H.225 and Q.931 messages and prepares to open the media channel. Open and start the H.245 logical channel, open the logical control channel, and carry the control channel on the logical channel 0. From the establishment of digital communication at the terminal, the control channel is always open until the end of the communication. When the reliable H. After the 245 control channel is established, audio, video and data transmission channels can be established accordingly. Capability exchange is to exchange their respective processing capabilities for media streams and determine the capabilities shared by both parties, so as to ensure that multimedia signals are accepted by both parties. Capability exchange follows the H.245 protocol. All capabilities of the terminal are described in a set of capability description structures. With this structure, the precise information of each terminal capability is expressed in the relevant compact structure. The above procedures can be used to describe the capabilities possessed in various mode combinations.

The capability exchange involved in the method of the present invention should include the PSTN access capability and PSTN access number in the capability concentration of the video conference terminal and the MCU. Master-slave determination means that a conflict occurs when two endpoints in a call simultaneously initiate the same event. For example, a resource can only be used by one event. In order to solve this problem, the terminal must judge who is the master terminal and who is the slave terminal. The master-slave discrimination process is used to judge which terminal is the master terminal and which is the slave terminal. After the master-slave determination is completed, the calling party opens the local logical channel, and the called party receives the OLC sent by the calling party to open the local logical channel. Both parties receive and process H.245 messages, and send and receive media data on media channels.

During the normal communication process, the MCU checks the PSTN access capability of the terminal. If the terminal has the PSTN access capability, the MCU monitors the packet loss rate of the IP communication network in real time during the communication process. When the packet loss rate of a certain terminal is detected When the set value is reached, such as 50%, the MCU first checks whether there is any remaining PSTN interface resources. If so, the MCU automatically initiates a PSTN phone call to the IP conference TV terminal, and the IP conference TV terminal automatically answers the PSTN call call; after the connection is established, the voice of the IP video conferencing terminal can be connected to the MCU to join the meeting, and the voice of the entire conference is also sent to the IP video conference terminal, realizing the backup of the voice channel of the IP video conference terminal. The videoconferencing terminal can continue to carry out the voice conference normally to ensure the normal progress of the conference.

If the normal IP conference connection is maintained between the videoconferencing terminal and the MCU, the MCU can continue to monitor the packet loss rate of the network. When the packet loss rate drops to a set value, such as 10%, the MCU can automatically hang up the terminal PSTN connection, and release the corresponding PSTN interface resources, and use the IP conference connection.

Thus, the method of the present invention realizes the backup of the voice channels of one or more conference TV terminals, ensures that the voice conference can be connected through the PSTN network when the IP conference connection fails, and keeps the normal progress of the voice conference.

However, the above is only a specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (5)

1, a kind of method of backing up speech channel in conference TV system, it may further comprise the steps:

A: in video conference terminal, increase the pstn telephone interface arrangement, be used for the voice of meeting television terminal are linked into the PSTN network;

B: increase one or more PSTN interface arrangement in the multipoint control unit in TV conference system, be used to insert the PSTN voice of multichannel video conference terminal;

C: described video conference terminal active call multipoint control unit initiates to connect, if communication network failure connects unsuccessful, described video conference terminal is initiated PSTN from the described multipoint control unit of trend and is called out, and the PSTN voice is joined carry out backing up speech channel in the meeting.

2, method according to claim 1, it is characterized in that, described method also comprises: among the described step c, if communication network is normal, described video conference terminal can be connected with described multipoint control unit, then in connection procedure, comprise the capabilities exchange of PSTN access capability and PSTN access code.

3, method according to claim 1 is characterized in that, the PSTN backing up speech channel in the conference process among the described step c also comprises the steps:

A) described multipoint control unit is monitored the packet loss of each road videoconference terminal communication network in real time;

B) when the network packet loss rate that monitors a certain video conference terminal rises to set point, described multipoint control unit is initiated pstn telephone to this video conference terminal and is called out;

C) after described video conference terminal received that this pstn telephone is called out, automatic-answering back device inserted;

D) described multipoint control unit carries out audio mixing with the PSTN voice of this video conference terminal and handles, and the voice of meeting is passed through PSTN pass to described video conference terminal, to guarantee its normal voice conferencing.

4, method according to claim 3 is characterized in that, the PSTN backing up speech channel in the conference process among the described step c also comprises the steps:

E) described multipoint control unit is monitored the packet loss of each road videoconference terminal communication network in real time;

F) when the network packet loss rate that monitors this video conference terminal drops to preset value, the PSTN that described multipoint control unit is hung up this video conference terminal automatically connects.

5, method according to claim 4 is characterized in that, described set point is 50%, and described preset value is 10%.

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