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Cisco SIP IP Phone 7960 Administrator Guide
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Appendix B SIP Call Flows
Call Flow Scenarios for Successful Calls
6
180 Ringing—SIP proxy server
to Cisco SIP IP phone A
SIP proxy server sends a SIP 180 Ringing response to
Cisco SIP IP phone A.
The timeout expires before the phone is answered.
7
CANCEL (Ring Timeout)—SIP
proxy server to Cisco SIP IP
phone B
SIP proxy server sends a CANCEL request to Cisco SIP IP
phone B to cancel the invitation.
8
200 OK—Cisco SIP IP phone B
to SIP proxy server
Cisco SIP IP phone B sends a SIP 200 OK response to the
SIP proxy server. The response confirms receipt of the
cancellation request.
9
INVITE—SIP proxy server to
Cisco SIP IP phone C
SIP proxy server sends a SIP INVITE request to Cisco SIP
IP phone C. The INVITE request is an invitation to User C
to participate in a call session.
10
180 Ringing—Cisco SIP IP
phone C to SIP proxy server
Cisco SIP IP phone C sends a SIP 180 Ringing response to
the SIP proxy server
11
200 OK—Cisco SIP IP phone C
to SIP proxy server
Cisco SIP IP phone C sends a SIP 200 OK response to the
SIP proxy server.
12
200 OK—SIP proxy server to
Cisco SIP IP phone A
SIP proxy server forwards the SIP 200 OK response to
Cisco SIP IP phone A.
13
ACK—Cisco SIP IP phone A to
SIP proxy server
Cisco SIP IP phone A sends a SIP ACK to the SIP proxy
server. The ACK confirms that Cisco SIP IP phone A has
received the 200 OK response from Cisco SIP IP phone C.
14
ACK—SIP proxy server to Cisco
SIP IP phone C
SIP proxy server forwards the SIP ACK to the Cisco SIP IP
phone C. The ACK confirms that Cisco SIP IP phone A has
received the 200 OK response from Cisco SIP IP phone C.
Step Action Description