You didn't state if this was a consistent problem or happened occasionally.
I've have had this happen as well, or so it would appear, but what actually happened was that the caller made the call, after 3 or 4 rings on their end, they hung-up and immediately redialed. By the time I answered the first call, it had ended showing a missed call and the second call actually came in on the call waiting side and showed a logged unknown answered call. It's a problem with connection lag. This is an occasional occurrence and the caller is using speed dial.
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