SIP从登陆到呼叫过程
1.REGISTER
2.REGISTER PROXY REQ
3.REG PRO RESPONSE
4.REG OK
5.INVITE REQ
6 INVITE AUTH REQ
7 INVITE AUTH ACK
8 INVITE AUTH RESPONSE
9 TRYING
10 G711 SEND
1.REGISTER
2.REGISTER PROXY REQ
3.REG PRO RESPONSE
4.REG OK
5.INVITE REQ
6 INVITE AUTH REQ
7 INVITE AUTH ACK
8 INVITE AUTH RESPONSE
9 TRYING
10 G711 SEND