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1f7e9bfad5
Make it possible to start a playback and the calling party
to receive audio on a bridge before the call is connected.
Model the implementation after play_on_channel and deliver a
AST_CONTROL_PROGRESS before starting the playback.
For a PJSIP channel this will result in sending a SIP 183
Session Progress.
(cherry picked from commit 1171dcee02)