Is there a setting which will cause the phone to be silent when a bluetooth device is handling the communication? For example, I am using a Motorola Roadster 2 for hands free phone use in my car. When a call or text arrives, the Roadster announces the call, etc. but at the same time that the Roadster is announcing the call, the phone is ringing. I would have thought that silencing would be automatic when another device is handling the communication, but apparently it is not.