综合UDP打洞与Http代理的SIP穿越NAT方案  

Solution of NAT Traversal in SIP Integrated UDP Hole Punching and Http Proxy

作　　者：周敏[1] 余慕春 黄维丰 

机构地区：[1]南京航空航天大学计算机科学与技术学院,江苏南京210016 [2]南京航空航天大学航空宇航学院,江苏南京210016 [3]中兴通讯有限公司 [4]中兴网信科技有限公司,江苏南京210012

出　　处：《计算机技术与发展》2014年第8期147-151,156,共6页Computer Technology and Development

基　　金：江苏省研究生培养创新工程项目(CXLX13_134)

摘　　要：软交换是下一代网络中的核心技术,SIP协议作为下一代网络最重要的协议之一,已经被广泛应用于VoIP系统中。SIP协议无法支持SIP信令和媒体流的NAT穿越,从而限制了其在广域网上的应用和发展。虽然目前解决NAT穿越的方案已经很多,但都存在着一定的局限性。文中详细解释了NAT对SIP通信的影响,介绍了UDP打洞技术的基本原理,介绍了UDP打洞技术穿越锥形NAT的流程,以及Http代理网关方式穿越各种NAT的流程。文中通过比较各种NAT穿越方案的优缺点,提出一种综合UDP打洞与Http代理网关的NAT穿越方案。经过论证与实验,证明了该方案的可行性。Soft switch is the core technology of next generation network. SIP protocol as one of the most important protocols in the next generation network,has been widely used in VoIP systems. SIP protocol can’ t support SIP signaling and media stream through NAT, which limits its application and development in the WAN. Although there are many NAT traversal solutions,every solution has limitations. In this paper,explain the impact of NAT on the SIP communication in detail,introduce the basic principle of UDP hole punching technology,the process of using UDP hole punching through the cone NAT and using the Http proxy gateway through various NAT. Compared the advantages and disadvantages of various NAT traversal solutions,present a NAT traversal solution which integrates UDP hole punching and Http proxy gateway technology. After the argument and experiment,it proves the scheme is feasibile.

关 键 词：初始会话协议 NAT UDP打洞 STUN HTTP隧道 

分 类 号：TN915[电子电信—通信与信息系统]