I was just about to purchase a line out car charger such as the Griffin AutoPilot or the XtremeMac InCharge Auto AUX and started thinking about how this works when the phone rings. Right now, I'm using a tape adaptor and a standard cigarette lighter charger. When the phone rings and I'm listening to music, the ringer plays through the car's speakers. With this though, I'm wondering if it will do the same. My concern is if I just have it plugged in and listening to the radio, the phone will ring, the ringer pushed through the dock connector, but it will not come through the car speakers.