【摘要】 现在的网络会议是基于H.323协议族的,H.323沿袭传统电信网的运行和管理模式,本身较复杂,使它应用于网络会议存在着缺陷。会话初始化协议SIP是由互联网工程任务组IETF制订的用于在两个或多个用户之间建立、修改和终止多媒体会话的信令协议,现在的主要应用仅限于端对端的实时通信。为此,在SIP已有扩展的基础上,该文提出了用SIP实现多端网络会议的一种方法,给出了网络框架、信令过程及具体的消息实现。更多还原

【Abstract】 Nowadays,Inter ne t Conferencing is based on H.323protocol stack,which has shortcomings to so me extent owing to its following the philosophy of traditional voice systems and its complexity.The Session Initiation Protocol(SIP),developed by IETF,h as been defined as a signaling protocol for the establishment ,maintenance and termination of multimedia sessions between two or more users.It is now limited to signaling for point-to-point real-time communication.This paper pre sents a way for multiparty Internet Conferencing using SIP based on existing SIP extensions.The network architecture,signaling procedure and specific message implementation are given.更多还原