C-18
SIP IP Phone to Analog Phone via Gateway
Figure C-9. Call Flow Diagram: SIP IP Phone to SIP IP Phone via SIP Gateway — Diagram 2
16. ACK
17. ACK
18. ACK
19. BYE
20. BYE
21. BYE
22. 200
23. 200
24. 200
SIP Phone UA Marshal Redirect Server 5300 Marshal Cisco 5300