C-58

SIP IP Phone to SIP IP Phone: Call Return
Figure C-22. SIP IP Phone to SIP IP Phone: Call Return — Diagram 2
SIP Phone UA Marshal Redirect Server Feature Server:
Call Return SIP Phone
16. INVITE
17. 100
18. 180
19. 180
20. 180
21. 180
22. CANCEL
23. 200
24. CANCEL
25. 200
26. CANCEL
27. 200
28. CANCEL
29. 200
30. INVITE
31. 100