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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
Call Flow Scenarios for Successful Calls
This section describes call flows for the following scenarios:
• Cisco ATA-to-SIP Server—Registration without Authentication, page D-2
• Cisco ATA-to-SIP Server—Registration with Authentication, page D-3
• Cisco ATA-to-Cisco ATA—Basic SIP to SIP Call without Authentication, page D-6
• Cisco ATA-to-Cisco ATA—Basic SIP to SIP Call with Authentication, page D-12
Each of the call flows includes a call diagram, action descriptions table, and a sample log file.
Cisco ATA-to-SIP Server—Registration without Authentication
Figure D-1 illustrates the Cisco ATA registering with the SIP server. Authentication is not required for
registration.
The call flow is as follows:
1. Cisco ATA requests registration.
2. Registration is completed.
Figure D-1 Cisco ATA-to-SIP Server—Registration without Authentication
Table D-1 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
200 OK—SIP server to Cisco ATA 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 ATA 186 IP network SIP server