I just picked up an '03 A4 3.0 with the Bose Symphony II stereo last week; haven't received my owners manual from dealership yet (long story). The stereo seems to be muting randomly when I start the vehicle and I can't figure out how to "un-mute".

From what I've read there's a telephone mute option for this stereo which I believe is the culprit here, but I don't have a telephone installed in the car...just the cell phone in my pocket. I'm trying to figure out what exactly is triggering the stereo to mute the volume and how I turn this function off? Any help is greatly appreciated.