Rotary phones did not all rotate at the same speed. You could dial a number while making it spin faster, or slower, it would still dial correctly. There are a few other hacks as well for those old phones. You could also dial each number using any number, as long as you made it 'click' enough times (iirc).
With that said, if the sound is from a fairly standard rotary, than you probably could guess the number that was dialed, dial it and see what the answer is.
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