In Dial Action verb, there is Play/Say verb. If callee in Dial Verb return back 480 Unavailable. RC send RQNT for stop ringing tone and RQNT for play verb really fast at the same time. When Media server return back NTFY for stoping ringing tone RQNT, RC understand this is NTFY for Playing verb that make RC move to next verb and finish Play/Say verb at this point
In Dial Action verb, there is Play/Say verb. If callee in Dial Verb return back 480 Unavailable. RC send RQNT for stop ringing tone and RQNT for play verb really fast at the same time. When Media server return back NTFY for stoping ringing tone RQNT, RC understand this is NTFY for Playing verb that make RC move to next verb and finish Play/Say verb at this point