SIP穿越双对称型NAT的研究与应用  

作　　者：曹龄兮[1] 

机构地区：[1]广深铁路股份有限公司广州电务段

出　　处：《铁道通信信号》2008年第9期34-36,共3页Railway Signalling & Communication

摘　　要：NAT技术较好地解决了IP地址紧缺的问题并提高了网络的安全性,但是却阻碍了SIP消息的穿越,给以SIP为信令控制协议的专用网络带来了难题。详细分析了SIP穿越NAT的过程;根据对称型NAT的特点,对SIP消息进行了扩展,提出了一种新的穿越方式,使得双方均位于对称型NAT之内的SIP终端可以建立通信。NAT technology has solved the problem of IP address shortage and enhanced the security of network, but it baffles traverse of SIP message and makes the special network difficult, which takes SIP as signal control protocol. This paper detailedly analyzes the process of SIP through NAT; and extends SIP message accord with the character of the symmetrical NAT, then presents a new method with traverse of NAT, and the communication can be established when both sides within each symmetrical NAT.

关 键 词：会话初始化协议 网络地址转换 对称型 

分 类 号：U285[交通运输工程—交通信息工程及控制]