Well, nothing happens. I usually log “call.playback.started” and “call.playback.ended” in my event callbacks, and they will only show up in my log if I’m playing the audio to the channel. If I play the audio to the bridge, I will hear it on the call, but my callbacks don’t print anything.
I can say, though, that we have test coverage for those events from playback on a bridge[1] which is passing, and I just ran and confirmed the events work - which likely points to something in your environment/ARI application so you’d need to investigate from that perspective.