Have you checked to see if you have Call Detail Records enabled on all call processing servers in the cluster? Check the Call Manager service parameters. You have to modify the parameter individually on each cluster node. If you find that this has not been done then you have no way to retrieve past records. If you find that it is turned on, then you will want to check CDR Analysis and Reporting (CAR) tool to see if you have it configured to process and report on CDRs.
You may want to read through this document:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/6_1_1/car/cmcarbk.html
It should give you a clear picture of the pre-requisite tasks.
HTH.
Regards,
Bill
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