Cisco ATA-186 Administration Guide - Page 194
CiscoATA-to-CiscoATA—Basic SIP to SIP Call with Authentication
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Call Flow Scenarios for Successful Calls Appendix D SIP Call Flows Cisco ATA-to-Cisco ATA-Basic SIP to SIP Call with Authentication Figure D-4 illustrates a call from one Cisco ATA to another. Authentication by the SIP server is required. The call flow is as follows: 1. Authentication is requested for call initiated by Cisco ATA A. 2. Call is established between Cisco ATA A and Cisco ATA B. 3. Call is terminated. Figure D-4 Cisco ATA-to-Cisco ATA-Basic SIP to SIP Call with Authentication Cisco ATA 186 A IP network SIP server IP network Cisco ATA 186 B V V 1. INVITE 2. 100 Trying 3. 407 Proxy Authentication Required 4. ACK 5. INVITE 6. 100 Trying 10. 180 Ringing 12. 200 OK 13. ACK 2-way voice path 15. BYE 16. 100 Trying 19. 200 OK 7. INVITE 8.100 Trying 9. 180 Ringing 11. 200 OK 14. ACK 17. BYE 18. 200 OK 72120 D-12 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) OL-3410-01