Hello there I recently brought an used 2011 C5 Tourer. Its amazing car. Problem is when I pair my phone via bluetooth I am getting no sound from the radio speakers except the radio on air music. I mean music is not lowering and radio does not switching to the bluetooth device, call or anything. I can make calls via controls, list the numbers on the phone etc but no sound coming from the bluetooth. Radio just playing regular on air music. I have tried 3 different phones and same thing happens. Please advise. Thanks.