It could be a receiver issue, the cord, it might be a faulty receiver or alternatively it could be plugged with wax or badly affected by moisture. Receiver issues are relatively common with Siemens, if you have cleaned out the tip and are confident it is not a moisture issue, the receiver has failed. it is an easy fix and your audi should be able to change it out on the spot.
SOURCE: it's exactly like the guy says on the left:
The receiver, the piece you call the cord is either blocked with wax or dead. Check the very tip of the receiver for wax detrius, if there is some remove it and see if you can hear. If not you may need to get a new receiver.
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