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B-45
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
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 IP
10. 200 OK
4. INVITE B
8. 180 Ringing
9. 200 OK
12. ACK
7. INVITE C
5. 486 Busy Here
6. ACK
1. INVITE B
11. 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
41472
2-way RTP channel