I had the same problem a while back, but it was only with certain people in my address book. Finally I realized that it was only the people that I had set up with an answer tone. (When they call me, and my phone is ringing, they hear a song chosen by me, instead of the normal, ring, ring that we all hear.)
Once I deleted the answer tones on my AT&T account, it worked fine. Hope this helps!
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