Call duration is not exactly the difference between Stop time and Start time

Problem

When examining the Call Statistics table, the value of Duration is not the same as one would obtain by calculating the difference between Stop time and Start time.

For example:

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Solution

The value of Duration is obtained with the difference between Stop time and Start time. using six decimals, that is, more than those you see in the table (three for both Start time and Stop time). After that, the value is rounded to the milliseconds. This is the reason why you see a discrepancy between Duration and the value expected from Start time and Stop time in the table. The result is, however, very accurate.