基于PDA的SIP穿越NAT的设计与实现

Design and Implementation of SIP Though NAT Based on PDA

SIP是IETF提出的IP电话信令协议,广泛应用于数据、语音、视频等多媒体通信业务中。但网络中大量NAT的存在,限制了其在广域网上的应用和发展。本文设计并实现了一种基于STUN协议的NAT穿越方案。该方案目前已成功应用于基于PDA的无线VOIP网络中,并可推广到其它基于SIP协议的终端上,为VOIP业务的推广应用扫清了障碍。

SIP is delivered by IETF for IP telephone signaling, SIP is widely used in multimedia communication transactions such as data,voice,video. But vast NAT is using in the network, which restricts the application and development of it on WAN. the paper proposes a solution based on Simple Traversal of UDP through NAT to solve this problem. This solution has been adopted successfully in the VOIP network based on PDA platform, and it can also be applied to other SIP protocol based terminals, which cleans out the obstacle for applying VOIP.