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C-3
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Appendix C SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure C-1 Cisco IP Phone-to-SIP Server—Registration without
Authentication
Table C-1 Action Descriptions
Step Action Description
Step 1
REGISTER—Cisco IP Phone to SIP server Cisco IP Phone sends a REGISTER message to
the SIP server to register the address in the To
header field.
Step 2
100 Trying—SIP Server to Cisco IP Phone SIP server returns a 100 Trying message,
indicating that the REGISTER request has been
received.
Step 3
200 OK—SIP server to Cisco IP Phone SIP server returns a final 200 OK response,
confirming that registration is complete.
1. REGISTER
2. 100 Trying
3. 200 OK
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Cisco IP Phone IP network SIP server
IP