Cisco Systems 1.3.0 manual Ack

SIP Phone	UA Marshal		Redirect Server	Feature Server:	SIP Phone	SIP
						IP
				Call Return
	32.	INVITE				Phone
	33.	302
						to
	34.	ACK				SIP IP
	35.	INVITE
	36.	100				Phone:
	37.	302				Call
	38.	ACK				Return
	39.	302
	40.	ACK
	41.	INVITE
	42.	100
	43.	INVITE
	44.	302
	45.	ACK
46. INVITE
47. 100

Figure C-23. SIP IP Phone to SIP IP Phone: Call Return — Diagram 3

C-59