when entering the car and when a call has been initiated press the talk key on cars steering wheel, issue the command "TRANSFER" . That should do it, unfortunately its not automatic.
Thanks for the reply. I was aware of the transfer option, but I'd much prefer it to happen automatically. Half the time the transfer option doesn't seem to work. The car replies with "There is no call in progress".
I also own a 2007 BMW 328i Sedan and I have to say that the bluetooth features are dramatically better and easier to use on the BMW.