While assisting with some issues on the Microsoft Technet Forums I stumbled across the Lync Voice Call Analyzer created by Desmond Lee, MVP.
So i decided to download it and give it a try.
Entered in all my information, dates and Search Target, which exports all call detail information into a .csv file.
Shows all information including transfers, PSTN, outbound, conferences, number of participants... Looks great. Would be a great piece of software for clients looking to see how much a user is on the phone and how long. Remember you will need user credentials or will use your domain joined credentials. Great work Desmond.
You can downloaded it from his website.