Signals that available audio outputs have changed. The applications has to call CTelephonyAudioRouting::AvailableOutputs to get the updated list.

Signals that current output has changed. The applications has to call CTelephonyAudioRouting::Output to get the current active output.

The application will get this callback only when the change in output is due some other application's CTelephonyAudioRouting::SetOutputL call OR because of user has deleted audio link through long key press on the BT device OR when adaptation routes audio from device to BT accessory automatically when user initiated long key press event occurs.

Signals that CTelephonyAudioRouting::SetOutputL request issued by this application (on CTelephonyAudioRouting instance) was serviced by the Adaptation. Only when the observer receives this callback, the application should consider CTelephonyAudioRouting::SetOutputL message to be completed.