Tristo
first up - welcome aboard
can't answer your post directly I'm afraid - need to ask a couple of questions back first!
To set the scene - is this the full
HFT system (mic up by the interior lights), or the add on version (mic up on the A pillar)?
If the radio is playing, and you get an incoming call, when you click the 'talk' button on the steering wheel - what happens?
Does the radio mute?