摘要
随着技术的成熟,VoIP技术以更加迅猛的势头得到发展和普及,但是在这个过程中也不可避免的碰到一些困难和问题,VoIP应用如何穿越NAT的问题就是其中之一。本文研究了NAT技术给VoIP服务带来的问题,并且就当前最佳的NAT穿透方案SBC进行探讨,然后在此基础上选择一个无须对现有设备进行任何改动SBC穿越NAT方案--Pinhole。研究SBC-Pinhole在典型的网络VoIP构架系统中的设计。SBC方案,是迄今为止,对FW/NAT问题解决最完善的方案,实施SBC针孔解决方案,可以协助VoIP信令与媒体流穿越穿越远端防火墙/NAT设备,所有经过SBC的信令和媒体流可以在系统侧和用户侧正确传输,而不需要对现有的FW/NAT设备做任何改变。。
With the accomplishment of its technical maturation, VolP has been more rapidly developed and spread. However, some difficulties and problems also arise unavoidably and the problem, how VoIP applications traverse NAT or Firewall is one of them. This thesis analyzes the issues brought by NAT in VoIP services and discusses the best solution named SBC for traversing NAT. And then a solution called Pinhole is brought forward, which can do without changing any the present device. A SBC is located at the border of VolP system. SBCs manipulate SIP messages and transmit media packets so as to provide traversal of NAT/Firewalls. The design of SBC-Pinhole has been done in this thesis.
出处
《信息通信》
2008年第6期57-60,共4页
Information & Communications
