Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure B-11 Cisco SIP IP Phone-to-Cisco SIP IP Phone Network Call Forwarding (No Answer)
IP Network
IP
IP
IP
SIP IP | Proxy | Redirect | SIP IP | SIP IP |
Phone | Server | Server | Phone | Phone |
User A |
|
| User B | User C |
1. INVITE B
6. 180 Ringing
12.200 OK
13.ACK
2.INVITE B
3.300 Multiple Choices
4.INVITE B
5.180 Ringing
7.CANCEL
8.200 OK
9.INVITE C
10.180 Ringing
11.200 OK
14. ACK
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