One thing you can do is to check out the SMDR logs.

Almost certainly it is too late now, but there is an option to set SMDR to log out to a file on the VMU. Grab that file from the VMU into Excel, and sort and manipulate it.

Unfortunately, it isn't very user friendly, but it is raw data that could be helpful in the future if you set SMDR to log on the VMU in the programming.

You can also obtain SMDR via a serial port (or if at version 11, over TCP/IP but that
requires software, some diagnostic program on the Axxess Installer disc can connect and display SMDR data in real time (ie. after the call is complete is when SMDR is logged).