Cisco ATA-186 Administration Guide - Page 195
SIP server passes ACK response to Cisco ATA B., Trying-SIP server to Cisco ATA
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Appendix D SIP Call Flows Call Flow Scenarios for Successful Calls Table D-7 Action Descriptions Step Action Description Step 1 INVITE-Cisco ATA A to SIP server Cisco ATA A sends a call session INVITE request to the SIP server to pass on to Cisco ATA B. Step 2 100 Trying-SIP server to Cisco ATA A SIP server returns a 100 Trying message, indicating that the INVITE request has been received. Step 3 407 Proxy Authentication Required- SIP server SIP server returns a request for authentication to Cisco ATA A. to Cisco ATA A Step 4 ACK-Cisco ATA A to SIP server Cisco ATA A acknowledges the request for authentication. Step 5 INVITE-Cisco ATA A to SIP server Cisco ATA A sends a call session INVITE request along with authentication credential to the SIP server to pass on to Cisco ATA B. Step 6 100 Trying-SIP server to Cisco ATA A SIP server returns a 100 Trying message, indicating that the INVITE request has been received. Step 7 INVITE-SIP server to Cisco ATA B SIP server sends the call session INVITE request to Cisco ATA B. Step 8 100 Trying-Cisco ATA B to SIP server Cisco ATA B returns a 100 trying message indicating that the INVITE request has been received. Step 9 180 Ringing-Cisco ATA B to SIP server Cisco ATA B sends a 180 ringing response to the SIP server to pass on to Cisco ATA A. Step 10 180 Ringing-SIP server to Cisco ATA A SIP server sends the 180 ringing response to Cisco ATA A. Step 11 200 OK-Cisco ATA B to SIP server Cisco ATA B sends a 200 OK message to the SIP server indicating that a connection has been established. Step 12 200 OK-SIP server to Cisco ATA A SIP server passes the 200 OK message to Cisco ATA A. Step 13 ACK-Cisco ATA A to SIP server Cisco ATA A sends acknowledgment of the 200 OK response to the SIP server to pass on to Cisco ATA B. Step 14 ACK-SIP server to Cisco ATA B SIP server passes ACK response to Cisco ATA B. A two-way voice path is established between Cisco ATA A and Cisco ATA B. Step 15 BYE-Cisco ATA A to SIP server Cisco ATA A terminates the call session and sends a BYE request to the SIP server indicating that Cisco ATA A wants to terminate the call. Step 16 100 Trying-SIP server to Cisco ATA A SIP server returns a 100 trying message indicating that the BYE request has been received. Step 17 BYE-SIP server to Cisco ATA B SIP server passes the BYE request to Cisco ATA B. Step 18 200 OK-Cisco ATA B to SIP server Cisco ATA 186 B sends a 200 OK message to the SIP server indicating that Cisco ATA 186 B has received the BYE request. Step 19 200 OK-SIP server to Cisco ATA A SIP server passes the BYE request to Cisco ATA A. OL-3410-01 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) D-13