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Appendix C SIP Call Flows
Call Flow Scenarios for Successful Calls
C-16
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Figure C-4 Cisco IP Phone-to-Cisco IP Phone—Basic SIP to SIP Call with Authentication
1. INVITE
IP network IP networkSIP server
2. 100 Trying
3. 407 Proxy Authentication Required
4. ACK
5. INVITE
6. 100 Trying
7. INVITE
8.100 Trying
9. 180 Ringing
10. 180 Ringing
2-way voice path
11. 200 OK
12. 200 OK
15. BYE
13. ACK
14. ACK
17. BYE
18. 200 OK
19. 200 OK
94055
Cisco IP Phone A
IP
Cisco IP Phone B
IP