Playback on 183 Session Progress
This scenario is triggered by setting the SPL options parameter to either playback-on-183-to-originator or playback-on-183-from-terminator in realms, session agents, or SIP interfaces. When both options trigger, playback-on-183-to-originator takes precedence. This scenario triggers only for 183 Session Progress responses to initial INVITEs, not for re-INVITEs.
- playback-on-183-to-originator—Starts playback upon the receipt of a 183 Session Progress destined for the originator and stops when a either a (200-299 or 400-699) final response is sent. When you configure this option, every call sent from the originator triggers this playback.
- playback-on-183-from-terminator—Starts playback upon the receipt of a 183 Session Progress response is received from the terminator and stops when a (200-299 or 400-699) final response is received. When you configure this option, every call sent to the terminator triggers this playback.
![](img/GUID-314A1CA2-7B54-46EA-8925-CB544F3D525E-default.jpg)
A call flow for the playback-on-183-from-terminator scenario looks like this:
![](img/GUID-CC3093E3-60B5-4231-8683-3265A988B8C4-default.png)