Just to check what others are seeing...

Blutooth audio in call is working beautifully.

Neither of my headsets allows me to answer or hangup a call. (I haven't yet tried it in the car.) I just get a low beep tone when I press the button.

Just me, or is this a general issue?

Honestly, I don't much care - having my hands free in-call is a huge win for me. (Callers can witter on as long as they like without stopping me from getting on with 'stuff'.) Will be more tricky in the car of course.