SIP中NAT穿透技术的研究及实现

摘要

With the rapid development of data service, packet -based multimedia communication system standards are widely used in vidco conference and IP phone. VolP developed from new generation network which is one of the most representative and perspective application technologies. SIP as one of signal control protocols of VoIP has great growth potentialities. So in order to extend the development of VoIP service, solving the problem of SIP traversal well will be an important research topic. In this paper, propose a solution for SIP traversal NAT through NATs based on UDP protocol. Finally realize the program in the VC environment and give the test results.%随着IP数据业务的蓬勃发展,基于分组的多媒体通信系统标准被广泛运用于视频会议和IP电话中,VOIP是新一代网络时代发展起来的最具代表性和发展前途的应用技术之一,SIP作为VOIP中的一种信令控制协议,具有很大的增长潜力,但SIP协议在设计时没有考虑到实际网络中会部署很多的NAT,为了更好的推广VOIP业务的发展,解决好SIP穿越NAT的问题将是一个重大的研究课题.文中主要在基于UDP穿透技术的基础上为SIP中NAT穿透提出了一种解决方案.最终在VC环境下实现该方案并给出测试结果.