基于ICE方式H．323信令穿越Symmetric NAT技术研究

基于IP的数据、语音、视频等业务在NGN网络中所面临的一个实际困难就是如何有效地穿越各种NAT／FW的问题。对此，H．323协议以往的解决方法有ALGs，STUN，TURN等方式。本文探讨了一种新的H．323信令穿越NAT／F、V的解决方案一交互式连通建立方式（ICE）。它通过综合利用现有协议，以一种更有效的方式来组织会话建立过程。并设计一个实例针对H．323信令协议穿越Symmetric NAT流程进行了描述，最后总结了ICE的优势及应用前景。

Research of H.323 Signal Traverse Symmetric NAT Based-ICE

In NGN Network, date,voice,video stream of Based-IP confront a fact difficulty that how to traverse efficient all kinds of NAT or FW. Generally resolve method of H.323 protocol include ALGS,STUN,TURN etc. This paper discuss a new resolve method-Interactive Connectivity Establishment(ICE) that it establish session efficienter by synthetizing other protocols's strongpoint and Design an example to illustrate the flow of H.323 protocol's signal traverse symmetric NAT, at last summarize ICE'S advantage and foreground of application.