On incoming call, do not start the ring tone if the call's state has been modified by listeners. Add onStartRingtone to decide when to start ring
Cherry-pick MR : liblinphone!1272 (merged)
On incoming call, do not start the ring tone if the call's state has been modified by listeners. Add onStartRingtone to decide when to start ring
Cherry-pick MR : liblinphone!1272 (merged)