Iphone 6 doesn't work with Uconnect

My iPhone 6 won't work with Uconnect. I can connect the phone, but as soon as I make a call it doesn't come through the speakers. I have tried a number of things suggested including deleting the blue-tooth connection both on the phone and the car. I have reset the network on the phone. I have done a hard restart on the phone. My Uconnect has the latest software upgrade. Please, please help!