SIP呼叫典型流程图解及详细解释(DOC 41页)

1. Sip协议的相关术语：.....2
2......注册流程.....4
3......注销流程：.....6
4......基本呼叫建立过程：.....7
5......会话更改流程：.....8
6......正常呼叫释放过程：.....10
7......被叫忙呼叫释放：.....11
8......被叫无应答流程一：.....12
9......被叫无应答流程二：.....13
10......遇忙呼叫前转：.....14
11......无应答呼叫前转流程：.....16
12......呼叫保持：.....18
13......呼叫等待：.....21
14......盲转流程.....25
15......询问转的流程.....27
16......彩铃的流程.....28
17......三方通话.....31
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