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Appendix C SIP Call Flows
Call Flow Scenarios for Successful Calls
C-18
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Step 13
ACK—Cisco IP Phone A to SIP server Cisco IP Phone A sends acknowledgment of
the 200 OK response to the SIP server to pass
on to Cisco IP Phone B.
Step 14
ACK—SIP server to Cisco IP Phone B SIP server passes ACK response to
Cisco IP Phone B.
A two-way voice path is established between Cisco IP Phone A and Cisco IP Phone B.
Step 15
BYE—Cisco IP Phone A to SIP server Cisco IP Phone A terminates the call session
and sends a BYE request to the SIP server
indicating that Cisco IP Phone A wants to
terminate the call.
Step 16
BYE—SIP server to Cisco IP Phone B SIP server passes the BYE request to
Cisco IP Phone B.
Step 17
200 OK—Cisco IP Phone B to SIP server Cisco IP Phone 186 B sends a 200 OK
message to the SIP server indicating that
Cisco IP Phone 186 B has received the BYE
request.
Step 18
200 OK—SIP server to Cisco IP Phone A SIP server passes the BYE request to
Cisco IP Phone A.
Table C-7 Action Descriptions (continued)
Step Action Description