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H.323协议简介和呼叫流程编者：审核：修改记录文档编号版本号拟制人/修改人审核人拟制/修改日期更改理由主要更改内容（写要点即可）无目录第1章协议概念..............................................................................................................................11.1协议概述..................................................................................................................................11.2名词解释..................................................................................................................................21.3协议模型..................................................................................................................................31.3.1RAS...........................................................................................................................41.3.2Q.931...........................................................................................................................41.3.3H.245...........................................................................................................................41.3.4三者的区别和联系.................................................................................................41.4组件的特征..............................................................................................................................51.4.1GK..............................................................................................................................51.4.2GW..............................................................................................................................61.4.3MCU...........................................................................................................................71.4.4信息流...................................................................................................................81.4.5终端.......................................................................................................................8第2章协议命令..............................................................................................................................92.1RAS命令..................................................................................................................................92.2寻找网守消息..........................................................................................................................112.3注册登记消息..........................................................................................................................112.4注销消息..................................................................................................................................112.5修改消息..................................................................................................................................122.6接入认证授权和地址解析消息...............................................................................................122.7地址解析请求消息..................................................................................................................122.8呼叫脱离消息..........................................................................................................................132.9状态消息...................................................................