since the ringtone is sync here device is connected here automatically the volume and calling option will go through the bluetooth device try connection and then change volume of a playing track or simply calling volume the sync shown is to help you hear the ringtone you choose in your sound settings on the bluetooth device volume and all media controls will either happen from the headset controls or else if company is good like bose or Sennheiser it'll give you an app to control headset volume by in app features
