I fitted a kit to my last A4, with the telephone mute working and also the speaker output through the car speakers.
Didn't need any special leads, just connected the speaker output from the Nokia kit to the Tel Line + - connections and the mute wire to Mute.
Worked with no problems at all...
I looked into this, and in the end just changed the car..... You can only fit a Nav+ unit from a A4, the others will not fit directly.
Have a look at this site
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