The "Nortel Contact Center Manager Historical Reporting and Data Dictionary" says;
The amount of data generated for call-by-call statistics is very large; therefore, the time required to generate a report using call-by-call statistics is much greater than the time required to generate a report using summarized statistics.
Have not found any reason (in the books or in practice) to turn call by call records off.
So it's just an capacity issue.
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