D-12

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 with Authentication

Figure D-4 illustrates a call from one CiscoATA to another. Authentication by the SIP server is required.

The call flow is as follows:

1. Authentication is requested for call initiated by CiscoATA A.
2. Call is established between CiscoATA A and Cisco ATA B.
3. Call is terminated.
FigureD-4 CiscoATA-to-CiscoATA—Basic SIP to SIP Call with Authentication
V V
1. INVITE
Cisco ATA 186 A Cisco ATA 186 BIP network IP networkSIP server
2. 100 Trying
3. 407 Proxy Authentication Required
4. ACK
5. INVITE
6. 100 Trying
7. INVITE
8.100 Trying
9. 180 Ringing
10. 180 Ringing
2-way voice path
11. 200 OK
12. 200 OK
15. BYE
13. ACK
14. ACK
16. 100 Trying
17. BYE
18. 200 OK
19. 200 OK
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