SIP (Session Initiation Protocol) session auxiliary flow control method based on INFO message

A control method and conference technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as difficult to process BFCP messages, complex BFCP, failures, etc., to facilitate expansion and analysis, reduce network impact, and facilitate forwarding. Effect

Inactive Publication Date: 2011-11-09
AVONACO COMM SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem with this method is that an additional message mechanism is required to achieve the purpose of token control. In a complex network environment, there may be multiple SIP agents forwarding messages between the terminal and the conference server, and it is difficult to ensure that each The agents all process BFCP messages, so it may be caused by network reasons that TCP cannot establish a connection and fail
In addition, when connecting with the H.323 network, compared with H.239, the flow control protocol of the H.323 network, BFCP is too complicated and not easy to convert

Method used

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  • SIP (Session Initiation Protocol) session auxiliary flow control method based on INFO message
  • SIP (Session Initiation Protocol) session auxiliary flow control method based on INFO message
  • SIP (Session Initiation Protocol) session auxiliary flow control method based on INFO message

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Embodiment 1

[0028] See attached figure 1 , which is a schematic diagram of a SIP conference system in this embodiment, including a conference server and a SIP conference terminal respectively A, B, and C; by figure 1 It can be seen that the SIP terminal is connected to the conference server through the SIP proxy; the media between the three conference terminals A / B / C and the conference server can communicate with each other; for the sake of simplicity, the streaming media attached to the three terminals described in this example are all H. 263, and the mutual media can be encoded and decoded, and the conference server is only responsible for receiving and distributing the attached stream. This embodiment only includes one supplementary stream, which is commonly referred to as a dual stream, so it is also called a dual stream conference.

[0029] This embodiment adopts the extended MIME type "application / tokencontrol+xml", and the content of the message format is as follows:

[0030] 1. ...

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Abstract

The invention discloses a method for transmitting auxiliary flow control information through an INFO message in a centralized management mode session based on an SIP (Session Initiation Protocol). A session auxiliary flow token is controlled by a carried and extended MIME (Multipurpose Internet Mail Extensions) media type through the INFO message, so that the aim of dynamically managing the SIP session auxiliary flow is fulfilled. A token management message comprises token requesting, token request responding, token releasing and token withdrawing. A message is transmitted in the message format of XML (Extensive Makeup Language). The message contents are easy and flexible, and are easy to process and extend.

Description

technical field [0001] The invention relates to a method for transmitting attached stream control information through INFO messages in a centralized management mode conference based on RFC3261 standard SIP protocol. Background technique [0002] At present, conference technology based on SIP protocol has become one of the mainstream video conference technology standards, and streaming technology has also become an important application with the development of video conference technology. For an attached stream, only one user in the conference can send the attached stream media, while other users can only receive it. Therefore, it is necessary to control the transmission authority of the streaming media to complete the switching of the media source, which is the so-called token control. Applications with only a single attached stream can also be called dual streams. At present, most of the attached stream conferences are still limited to the application of dual stream techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L12/417
Inventor 薛建永
Owner AVONACO COMM SYST SUZHOU
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