C-78

User Agent to User Agent: Call Waiting
Figure C-28. User Agent to User Agent: Call Waiting — Diagram 3

VOCAL User Agent UA Marshal Redirect Server VOCAL User Agent VOCAL User Agent

32. INVITE
33. 200
34. INVITE
35. 200
36. ACK
37. ACK
38. BYE
39. 200
40. BYE
41. BYE
42. 200
43. 200