If CDR/CAR was enabled at the time those calls were made, you should be able to find them there, assuming the call went thru CUCM.
If not, then you would need to parse the CCM logs to find that.
Both are overwritten and/or are only stored for a certain period of time, so no idea if you can find those calls or not, as it would depend on your call volume.
HTH
java
if this helps, please rate