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D-4
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
OL-3410-01
AppendixD SIP Call Flows
Call Flow Scenarios for Successful Calls
Figure D-2 Cisco ATA-to-SIP Server—Registration with Authentication
Table D-3 Action Descriptions
Step Action Description
Step 1
REGISTER—Cisco ATA to SIP server Cisco ATA 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 ATA SIP server returns a 100 trying message, indicating that the
REGISTER request has been received.
Step 3
407 Proxy authentication required— SIP server to
Cisco ATA
SIP server returns a request for authentication.
Step 4
REGISTER—Cisco ATA to SIP server Cisco ATA attempts to register using its authentication
credential.
Step 5
100 Trying—SIP server to Cisco ATA SIP server returns a 100 trying message, indicating that the
new REGISTER request has been received.
Step 6
200 OK—SIP server to Cisco ATA SIP server returns a final 200 OK response, confirming that
the authentication credential has been verified and
registration is complete.
V
1. REGISTER
Cisco ATA 186 IP network SIP server
2. 100 Trying
3. 407 Proxy Authentication Required
4. REGISTER
5. 100 Trying
6. 200 OK
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