SIP用户代理软件的设计第五章程序介绍目录摘要.......................................................................................................................IVABSTRACT..................................................................................................................6第一章绪论.........................................................................................................71.1选题的背景............................................................................................................71.2基于SIP协议用户代理软件的国内外研究现状................................................91.3论文内容和结构安排..........................................................................................10第二章SIP协议及H.323协议簇的简介.............................................................122.1SIP系统的组成...................................................................................................16图2．1SIP系统的组成..................................................................................162.2SIP功能概要.......................................................................................................172.2.1用户定位...................................................................................................182.2.2会话能力的协商.......................................................................................182.2.3呼叫参与者管理.......................................................................................182.2.4呼叫建立...................................................................................................192.2.5呼叫处理...................................................................................................192.2.6SIP注册服务............................................................................................192.3SIP的呼叫过程...........................................................................................202.4协议的优点..........................................................................................................232.4.1基本呼叫的建立和拆除...........................................................................232.4.2呼叫控制业务...........................................................................................242.4.3SIP的第三方控制....................................................................................242.4.4服务质量...................................................................................................252.4.5实现的难易性...........................................................................................252.5SIP协议和H.323协议的比较............................................................................262.6本章小结..............................................................................................................28SIP用户代理软件的设计第五章程序介绍第三章SIP实现中VC的应用.............................................................................293.1对话框控件访问的七种方式...............................................................................293.2窗口.......................................................................................................................293.3网络编程Socket...................................................................................................303.3.1计...
