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计算机工程 ›› 2007, Vol. 33 ›› Issue (22): 148-150,. doi: 10.3969/j.issn.1000-3428.2007.22.051

• 网络与通信 • 上一篇    下一篇

基于代理的SIP穿越NAT和防火墙方案

蔡闻怡,陈一民   

  1. (上海大学计算机工程与科学学院,上海 200072)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-11-20 发布日期:2007-11-20

Proxy-based Solution About SIP Traversing NAT and Firewall

CAI Wen-yi, CHEN Yi-min   

  1. (School of Computer Engineering and Science, Shanghai University, Shanghai 200072)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-20 Published:2007-11-20

摘要: SIP协议作为NGN重要协议之一,广泛应用于VoIP等多媒体通信业务中。但由于SIP本身不支持SIP信令和媒体流穿越NAT和防火墙,限制了其在广域网上的应用和发展。该文分析了SIP穿越NAT的具体问题,提出了一种采用SIP和RTP代理服务器协同工作穿越NAT和防火墙解决方案,介绍了该方案的实现原理、拓扑结构,并叙述了具体实现过程及涉及的相关技术,最终实现了SIP信令流和媒体流的NAT和防火墙穿越。

关键词: 会话初始化协议, NAT, SIP代理服务器, RTP代理服务器, 媒体网关控制协议

Abstract: As one of the important protocol of NGN, SIP is widely used in multimedia communication transactions such as VoIP. But SIP can not traverse NAT/Firewall, which blocks the development of it on WAN. With the analysis of problems about SIP/NAT traversal, a scheme is proposed to support SIP signal and media stream traversing NAT/FW with the cooperation of SIP proxy and RTP proxy. The principle and topology of the schema is presented and the implementation how to traverse NAT/FW is described.

Key words: SIP, NAT, SIP proxy, RTP proxy, media gateway control protocol(MGCP)

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