摘要
P2PSIP系统整合了P2P技术和SIP协议的优势,是当今网络技术领域的热门应用之一。作为端到端的应用,NAT穿越是P2PSIP系统所必须解决的关键问题之一。首先概述了NAT的由来、工作原理及NAT的各种常见类型;然后阐述了系统中信令穿越NAT和媒体流穿越NAT所面临的问题;随后分析了当前各种NAT穿越方法的优缺点,在此基础下提出一种P2PSIP结点穿越NAT的方案:STUN+TURN方式,并在扩展会话描述协议SDP的基础上对该方案进行了详细设计。采用该方案的P2PSIP系统可以实现正常的VoIP通信。
P2PSIP system is one of the most popular network application which integrates the advantage of P2P techniq and SIP. As a Peer to Peer application,P2PSIP system must wive the problem of NAT traversal. Firstly outlines the origin, working mechanism and types of NAT; then analyzes the problem of NAT traversal in P2PSIP system; and proposes an STUN ＋ TURN scheme based on the research of several NAT traversal methods, while describes it in detail on the foundation of extension of SDP. Finally provides a brief summary of this scheme. In this scheme,P2PSIP system can realize normal communication of VoIP.
出处
《计算机技术与发展》
2009年第10期66-69,共4页
Computer Technology and Development
