I just bought a new iPhone 5s with ios7.1.1 installed. The phone pairs with bluetooth to my Volvo system without any trouble. It downloads my contacts. I can play my music from the iPhone through the Volvo system. The problem is when I try to place or receive a call, I have no audio from the phone through the system. I do not hear the ringing or the call being picked up. When I end the call the system returns to whatever I was listening to (radio or bluetooth music). Using another iPhone with iOS 7.0 all works as it should. It seems the trouble is with iOS 7.1.1. I have tried unpairing the device, restarting and repairing, but nothing changes. What to do?