Default [Q] moto g pairing with older BMW

Got the Moto G recently - overall very happy very good phone for the price.

I'm having a bit of trouble using it with the hands free setup in my car. This is the older BMW i-drive from 2007. I can pair the phone OK but when I make try to make a call from the i-drive it does not get registered on the phone - everything just goes quiet.

Just wondering if anyone has seen the same problem or managed to get the moto g working with older BMW i-drive.