摘要： 针对监视系统部署难以灵活扩展、实现成本高的问题，提出一种基于会话启动协议(SIP)的监视系统设计与实现方法。设计基于SIP协议的支持视频会议、视频监控和VoIP等多媒体业务的开放式通信系统，实现网络视音频连接、视音频采集编解码、回声抵消、回放和紧急呼叫等功能。结果证明该系统能够方便地与其他互联网协议结合并在各种网络环境下部署，提供较为丰富的IP多媒体业务。

关键词: 会话启动协议, 实时传输协议, 用户代理, 监视会议, 监视系统

Abstract: Aiming at the problem of low expansibility and high cost in the deployment of the monitoring system, this paper proposes a kind of method about the design and implementation of monitoring system based on Session Initiation Protocol(SIP), designs an open communication system which supports the multimedia services such as the video conference, the video monitoring and the VoIP based on SIP, and achieves the function such as the network establishment, the collection, coding and decoding of the video and audio, the cancellation and payback of the echo, emergency calls and so on. The result proves that the system can be deployed conveniently with other Internet protocols in all kinds of network environment, and supplies IP multimedia service abundantly.

Key words: Session Initiation Protocol(SIP), Real-time Transport Protocol(RTP), User Agent(UA), monitoring conference, monitoring system

中图分类号: 

• TP393