Ha! I'd be interested in the answer to this too. I have a Mk5 Golf that's not behaving correctly.
I have a Pioneer head unit and the Phone button allows me to hang up a call but not answer one (so some code is coming out of the button) and the star button mutes the radio.
I am about to encounter this on my brand new Tiguan too. I put the RNS-510 in over the weekend and the star button is not responding to anything (it's in the headlining) and the mouth/microphone button only mutes the radio.
MY08 Mk5 GT Sport - sold
MY14 Tiguan 118TSI - sold (Mazda3 SP25GT in its place)
MY16 Golf 7R: sold (Caterham Super 7 and Hyundai i30N in its place)
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