摘要
由于VoIP(Voice over Internet Protocol)技术采用的协议(SIP、H.323)无法顺利通过NAT或防火墙,因此,穿越NAT/FW问题是目前开展NGN业务最大的障碍,迫切需要解决。论文分析了基于SIP协议的在NAT/FW环境下存在的问题,提出了proxy的解决方案。本文的proxy是将代理服务器功能,注册服务器功能以及SIP消息和媒体流转发功能于一身的。不需要对企业网和用户驻地网现有的网络设备进行任何的改造,具有很强的适用性,而且组网灵活,可满足网络多样化用户的接入,为NGN的大规模应用提供了参考。
The protocols （such as SIPi cH.323 etc.） that VoIP（Voice over Internet Protocol） adopts is unable to traverse NAT and firewall, so the NAT/FW technology is the most essential factor in the application of NGN, and it should be solved as soon as possible. This paper deeply analyzes the SIP protocol and NAT/FW technology, discoveres the problem based on SIP protocol, under the environment of NAT/FW. On this foundations, this paper proposed a novel transversal model based on proxy. The proxy of this article has the function of proxy server, registrar Server and relaying SIP information and media stream. The proxy mode need not to change any network equipments and software, it is very applicable and effective and many connect different types users. The proposed model and realization provide the reference for the NGN application and has certain value to apply.
出处
《自动化技术与应用》
2011年第9期10-13,共4页
Techniques of Automation and Applications
