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C-5
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-2 Cisco IP Phone-to-SIP Server—Registration with Authentication
Table C-3 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
401 Unauthorized— SIP server to
Cisco IP Phone
SIP server returns a request for authentication.
Step 4
REGISTER—Cisco IP Phone to SIP server Cisco IP Phone attempts to register using its
authentication credential.
Step 5
100 Trying—SIP server to Cisco IP Phone SIP server returns a 100 trying message,
indicating that the new REGISTER request has
been received.
Step 6
200 OK—SIP server to Cisco IP Phone SIP server returns a final 200 OK response,
confirming that the authentication credential has
been verified and registration is complete.
1. REGISTER
IP network SIP server
2. 100 Trying
3. 401 Unauthorized
4. REGISTER
5. 100 Trying
6. 200 OK
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