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Media Server SIP multimedia conferencing system design and implementation of the control framework

Author: DengPengCheng
Tutor: ZhuQingXin
School: University of Electronic Science and Technology
Course: Applied Computer Technology
Keywords: Multimedia conferencing SIP Media Control Framework of the Conference Control framework
CLC: TP393.05
Type: Master's thesis
Year: 2011
Downloads: 44
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Abstract

SIP multimedia conferencing in the exchange of information has played a huge role, it provides users with a more direct and comprehensive communication. But in the previous SIP multimedia conferencing system, responsible for media handling media server often stationed in the same meeting, a host controller, making a conferencing system media processing capabilities subject to greater restrictions. To be managed media server has a separate conference system to improve overall media processing capabilities, reducing the burden of meeting the control system and bring conferencing system expansion capability as: increased media type support and media servers, and many other benefits. IETF is currently being developed related to this agreement, but more for the introduction of the draft. Thus a media server using SIP control framework study has some theoretical and practical significance. The purpose of this paper is to achieve the SIP-based media server control framework. The framework can be achieved after the SIP multimedia conference system with the other part of the integrated to form a complete multimedia conferencing system. For this purpose, this paper analyzes the SIP protocol, summarize and explain the characteristics of SIP protocol can be seen from the SIP protocol is ideal for multimedia session management. Next article introduces the SIP conferencing framework to centralized conferencing system made a note. In this framework, the conference control and media mixed together in part, is not suitable for people with multiple distributed media servers this situation. This is also the media server control framework put forward reasons. Rear portion of the article of the media server control framework of the basic principles, structure, composition and use some of the key technologies. Then in the pre-research needs of a company on its make some changes, such that the frame can either together with conference server implementations can also be achieved individually. In this paper, the process of implementation framework for how to find the media server's status change also raised the issue workaround. This point there is no explanation in the draft, the method takes advantage of the SIP subscription method so that a change of state occurs when the media server by the SIP server informed us. This eliminates the burden of control framework cyclic query, do not redefine the media server status query message, the agreement makes the whole system more single. In response to the changing needs of the actual, the article also defines a new message to the server for the same meeting to exchange information and extends the control packet to be used in place of the draft 3pcc establishment media stream process. In addition, the article also on the draft of the more obscure places as discussed, including: 1. The same media server is a long time to connect, or short-term connections, is a multi-line connection or line connection; 2. Keeping alive strategy: keep-alive timer or if necessary, keep alive. Finally, a framework for the realization of the main functions were tested, tested framework to meet the request of the Conference.

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