The call flow on the left highlights the changes when PRACK is enabled, as compared to the call flow on the right without PRACK enabled.
This call flow shows the call flow when UAS and UAC are set to PRACK Supported option.
This call flow shows when UAS and UAC are set to PRACK Require option.
This call flow shows the call flow when UAS is PRACK Supported and UAC is PRACK Disable.
This call flow shows the call flow when UAS is PRACK Require and UAC is PRACK Disable.
This call flow shows the call flow when UAS is PRACK Disable and UAC is PRACK Require.
This call flow shows when UAS is configured with PRACK Require option.
Note: The IMG must include an SDP answer in the 200 OK to PRACK when an SDP offer is received in the PRACK request