Motorola RAZR V3xx

I have the Moto V3XX (from ATT) and use it connected to the built-in bluetooth hands free system in my car. I am happy with it except for one thing - incoming calls do not ring. The nav screen shows the incoming call but unless I see it, I am not aware of the call until the caller speaks (I have it on auto answer).

Anyone know how I can hack or otherwise modify the V3XX to ring on incoming calls?