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Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
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 IP
12. 200 OK
6. 180 Ringing
4. INVITE B
8. 200 OK
11. 200 OK
10. 180 Ringing
14. ACK
9. INVITE C
7. CANCEL
5. 180 Ringing
1. INVITE B
13. ACK
3. 300 Multiple Choices
2. INVITE B
IP Network
SIP IP
Phone
User A
SIP IP
Phone
User B
SIP IP
Phone
User C
Proxy
Server
Redirect
Server
IP
7
3
2-way RTP channel