摘要
随着多媒体技术与网络技术的发展,H.323与SIP协议作为下一代网络NGN中的核心软交换技术的主要协议,必然在一段时间内长期并存。首先介绍了NGN的分层体系,接着对IP协议中的H.323协议、SIP协议做了精要的介绍,并对这两种关键IP协议的属性进行了深入比较。提出了实现H.323-SIP互通信令网关IWF的基本要求,建立了IP语音的封装结构,逻辑信道信令互通的常规机制以及Fast Start机制实现模式,着重对IWF实现的一些关键技术,最终实现了在IWF的H.323与SIP互通信令消息的转换交互过程。
With the development of multimedia and network technology, there are currently two major IP standards for signaling and control of internet protocols, namely ITU-TH. 323 and IETF SIP （ session initiation protocol）. First introduce the architecture of NGN , follow with the certain characters of H. 323 and SIP, then make a deep comparison for both H. 323 and SIP. Propose some specifications of IWF ,which is the inter-working function in the GW. Some key techniques for IWF are interpreted , the signaling interactive procedure is designed to realize the active IWF between H. 323 endpoints and SIP user agents, including the encapsulation structure of voice over IP, normal process and Fast Start process of the signaling definition for logic channel connections ,
出处
《计算机技术与发展》
2011年第3期154-157,160,共5页
Computer Technology and Development
基金
中兴科研基金资助项目(NY08外52)
国家自然科学基金资助项目(60872018
60902015)
江苏省自然科学基金科技创新人才启动资助项目(BK2007604)
高校博士学科点专项科研基金资助项目(20070293001)
