For info: it was the voice control module that was in one of the expansion slots on the replacement analogue radio - Probably because it had component protection.
After removing the module I now how simple (useless) voice commands again and the microphone works with hands free phone.
Hope it helps someone else.
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![](image.php?s=574d6b00e4b47b3bc1faaca48068e7ea&u=4099&type=sigpic&dateline=1644850948) 2003 A8 D3 V8 3.7l petrol - retro fit audi handsfree bluetooth, DAB Radio, Digital TV, fully populated aerial amp, metal capped window and handbrake switches, brushed metal dash trim and switches, graphic parking sensor display
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