Request to change current output. When the request is serviced by the Adaptation, this will result in CTelephonyAudioRoutingManager::OutputChangeRequestCompleted call by the adaptation.

For each request made by the client, there will be one function call, CTelephonyAudioRoutingManager::OutputChangeRequestCompleted from Adaptation.

If there are two requests back to back, Adaptation will service first request, call CTelephonyAudioRoutingManager::OutputChangeRequestCompleted and then consider the second request. This will be true for multiple back to back requests. (Back to back = pending requests in request queue).