Appendix D SIP Call Flows
Call Flow Scenarios for Successful Calls
Table D-5 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 | SIP server sends the call session INVITE request to Cisco ATA B. | ||
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Step 4 | 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 5 | 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 6 | 180 | SIP server sends the 180 ringing response to Cisco ATA A. | |
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Step 7 | 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 8 | 200 | SIP server passes the 200 OK message to Cisco ATA A. | |
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Step 9 | Cisco ATA A sends acknowledgement 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 10 | SIP server passes ACK response to Cisco ATA B. | ||
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A | |||
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Step 11 | Cisco ATA A terminates the call session and sends a BYE request | ||
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| to the SIP server indicating that Cisco ATA A wants to terminate |
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| the call. |
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Step 12 | 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 13 | SIP server passes the BYE request to Cisco ATA B. | ||
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Step 14 | 200 | Cisco ATA B sends a 200 OK message to the SIP server | |
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| indicating that Cisco ATA B has received the BYE request. |
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Step 15 | 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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