Cisco 7960 Administrator's Manual page 120

Call Flow Scenarios for Successful Calls
Figure B-3 Gateway-to-Cisco SIP IP Phone Call—Successful Call Setup and Call Transfer
PBX A
User A
1. Setup
3. Call Proceeding
6. Alerting
8. Connect
9. Connect ACK
2-way voice path
19. Alerting
22. Connect
23. Connect ACK
2-way voice path
Cisco SIP IP Phone 7960 Administrator Guide
B-12
GW1 IP Network
2. INVITE
4. 100 Trying
5. 180 Ringing
7. 200 OK
10. ACK
2-way RTP channel
11. BYE (Also: C)
12. 200 OK
13. INVITE (Requested-By: B)
15. 100 Trying
18. 180 Ringing
21. 200 OK
24. ACK
2-way RTP channel
Appendix B
SIP IP Phone
User B
IP
GW2
14. Setup
16. Call
Proceeding
17. Alerting
20. Connect
25. Connect
ACK
2-way voice
path
SIP Call Flows
PBX B
User C
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