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D-6
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
Cisco ATA-to-Cisco ATA—Basic SIP to SIP Call without Authentication
Figure D-3 illustrates a call from one Cisco ATA to another. Authentication by the SIP server is not
required.
The call flow is as follows:
1. Call is established between Cisco ATA A and Cisco ATA B.
2. Call is terminated.
Figure D-3 Cisco ATA-to-Cisco ATA—Basic SIP to SIP Call without Authentication
V V
1. INVITE
Cisco ATA 186 A Cisco ATA 186 BIP network IP networkSIP server
2. 100 Trying
3. INVITE
4. 100 Trying
5. 180 Ringing
6. 180 Ringing
7. 200 OK
8. 200 OK
9. ACK
10. ACK
11. BYE
12. 100 Trying
15. 200 OK
13. BYE
14. 200 OK
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2-way voice path