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D-3
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
OL-3410-01
Appendix D SIP Call Flows
Call Flow Scenarios for Successful Calls
Cisco ATA-to-SIP Server—Registration with Authentication
Figure D-2 illustrates the Cisco ATA registering with the SIP server. Authentication is required for
registration.
The call flow is as follows:
1. Cisco ATA requests registration.
2. SIP server requests authentication credential.
3. Authentication is received and registration is completed.
Table D-2 Log Listings
1.
REGISTER sip:192.168.2.97 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.194
From: <sip:9301@192.168.2.97;user=phone>
To: <sip:9301@192.168.2.97;user=phone>
Call-ID: 88397253@192.168.2.194
CSeq: 1 REGISTER
Contact: <sip:9301@192.168.2.194;user=phone;transport=udp>;expires=3600
User-Agent; Cisco ATA v2.10 ata186 (0705a)
Content-Length: 0
2.
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.2.194
Call-ID: 88397253@192.168.2.194
From: <sip:9301@192.168.2.97;user=phone>
To: <sip:9301@192.168.2.97;user=phone>
CSeq: 1 REGISTER
Content-Length: 0
3.
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.2.194
Call-ID: 88397253@192.168.2.194
From: <sip:9301@192.168.2.97;user=phone>
To: <sip:9301@192.168.2.97;user=phone>
CSeq: 1 REGISTER
Contact: <sip:9301@192.168.2.194;user=phone;transport=udp>;expires=“tue, 23 Oct 2001 14:24:57 GMT”
Expires: 3600
Content-Length: 0