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)
中图分类号:
蔡闻怡;陈一民. 基于代理的SIP穿越NAT和防火墙方案[J]. 计算机工程, 2007, 33(22): 148-150,.
CAI Wen-yi; CHEN Yi-min. Proxy-based Solution About SIP Traversing NAT and Firewall[J]. Computer Engineering, 2007, 33(22): 148-150,.