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。
As one of the important protocol of NGN, SIP is widely used in multimedia communication transactions such as VolE 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.
出处
《计算机工程》
CAS
CSCD
北大核心
2007年第22期148-150,180,共4页
Computer Engineering
