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介绍了SIP(session initiation protocol)协议的特点、功能和结构等,从路由、网络结构和典型呼叫流程方面研究分析SIP在软交换网络和IMS中的应用,最后对SIP的未来做出了展望。
This paper introduces the features, functions and structures of Session Initiation Protocol (SIP) protocol. It studies the application of SIP in softswitch network and IMS from the aspects of routing, network structure and typical call flow. Finally, the future of SIP is prospected.