Design and Realization of SIP Through NAT Based on Port Detection
Xian Li-li · Jisuanji gongcheng · 2008
To solve the problem of Session Initiation Protocol(SIP) traversing Network Address Translator(NAT),this paper describes a new method based on port detection.The scheme combines SIP user agent and STUN client,and adopts a method named port detection to obtain next port allocated by symmetric NAT.It brings that STUN can traverse most symmetric NAT and all other types of NAT.Some tests are made in real situations and the results reaches the goal.