Cisco 7905G Administrator's Manual page 190

Call Flow Scenarios for Successful Calls
Figure C-3 Cisco IP Phone-to-Cisco IP Phone—Basic SIP to SIP Call without Authentication
Cisco IP Phone A
IP
1. INVITE
2. 100 Trying
6. 180 Ringing
8. 200 OK
9. ACK
11. BYE
15. 200 OK
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
C-8
IP network SIP server
2-way voice path
IP network
3. INVITE
4. 100 Trying
5. 180 Ringing
7. 200 OK
10. ACK
13. BYE
14. 200 OK
Appendix C SIP Call Flows
Cisco IP Phone B
IP
OL-4277-01