viseeo tune2air has will switch between music and your cars Bluetooth Phone. So you can have a phone call in your car through your car. I have the WMA3000B with AUX/USB Y cable. I can also stream music via bluetooth and works great on mine.

 

I have the WMA3000B. I believe that music from my phone is on a different Bluetooth "Channel" than the Phone. When I first paired my phone with the car, it connected to channel MIM27855. When I later bought and paired the WMA3000B, it connected to channel Tune2Air. This works in my car. Music stops when I make or get a call.