Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure B-10 Cisco SIP IP Phone-to-Cisco SIP IP Phone Network Call Forwarding (Busy)
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
10.200 OK
11.ACK
2-way RTP channel
2.INVITE B
3.300 Multiple Choices
4.INVITE B
5.486 Busy Here
6.ACK
7.INVITE C
8.180 Ringing
9.200 OK
12.ACK
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