You can use the CDR reporting tool built into CUCM.  But first, it has to be turned on in the Service Parameters to start gathering calls.  If the calls have already been made and its not on, no reports.

Once you have it turned on, you can log into the CDR and download the raw data.  Open Excel up and import the TXT file into excel.  From there, you can sort data, etc.

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/service/7_0_1/car/carcdru.html