No matter what volume my IPhone is when in the truck and connected to Bluetooth, the truck speakers will ring at whatever volume it is set at on the radio, the radio has 2 different volume settings, one for radio, one for phone and I'm pretty sure Navigation is another setting, when a call comes in you turn your volume knob on the radio and the ringer will get louder, it should stay at the last setting every time you get in the truck. I guess thats where my confusion was, I've always had the truck ring when I get a phone call, never paid attention the ringer on the phone itself.