Appendix D SIP Call Flows
Call Flow Scenarios for Successful Calls
Table D-7 Action Descriptions
Step | Action | Description | |
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Step 1 | Cisco ATA A sends a call session INVITE request to the SIP | ||
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| server to pass on to Cisco ATA B. |
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Step 2 | 100 | SIP server returns a 100 Trying message, indicating that the | |
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| INVITE request has been received. |
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Step 3 | 407 Proxy Authentication Required— SIP server | SIP server returns a request for authentication to Cisco ATA A. | |
| to Cisco ATA A |
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Step 4 | Cisco ATA A acknowledges the request for authentication. | ||
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Step 5 | Cisco ATA A sends a call session INVITE request along with | ||
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| authentication credential to the SIP server to pass on to |
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| Cisco ATA B. |
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Step 6 | 100 | SIP server returns a 100 Trying message, indicating that the | |
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| INVITE request has been received. |
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Step 7 | SIP server sends the call session INVITE request to Cisco ATA | ||
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| B. |
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Step 8 | 100 | Cisco ATA B returns a 100 trying message indicating that the | |
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| INVITE request has been received. |
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Step 9 | 180 | Cisco ATA B sends a 180 ringing response to the SIP server to | |
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| pass on to Cisco ATA A. |
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Step 10 | 180 | SIP server sends the 180 ringing response to Cisco ATA A. | |
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Step 11 | 200 | Cisco ATA B sends a 200 OK message to the SIP server | |
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| indicating that a connection has been established. |
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Step 12 | 200 | SIP server passes the 200 OK message to Cisco ATA A. | |
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Step 13 | Cisco ATA A sends acknowledgment of the 200 OK response to | ||
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| the SIP server to pass on to Cisco ATA B. |
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Step 14 | SIP server passes ACK response to Cisco ATA B. | ||
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A | |||
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Step 15 | Cisco ATA A terminates the call session and sends a BYE | ||
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| request to the SIP server indicating that Cisco ATA A wants to |
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| terminate the call. |
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Step 16 | 100 | SIP server returns a 100 trying message indicating that the BYE | |
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| request has been received. |
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Step 17 | SIP server passes the BYE request to Cisco ATA B. | ||
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Step 18 | 200 | Cisco ATA 186 B sends a 200 OK message to the SIP server | |
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| indicating that Cisco ATA 186 B has received the BYE request. |
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Step 19 | 200 | SIP server passes the BYE request to Cisco ATA A. | |
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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)
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