I had this exact same problem and it turned out to simply be a recoding in the correct order.
Had your Q7 had anything done too it by the dealer just before this started happening ?
Mine had just been in to have the Nav Drive unlocked so I could remove the disc....when it returned I had all the problems your describing....they first though it was a faulty phone module ( hence the other person not being able to hear you ) then a faulty mic then I took it to another dealer who recoded it and all was fine.
Si
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