Exchange Reporter Plus gives granular details about the following:
Conferences: View details about conference sessions, users, settings, and more.
Instant Messaging: Get reports on IM users, activities, and filter configuration.
Audio/video: List details on calls (failed and otherwise), voice policies, unassigned numbers, and more.
File transfer: Get comprehensive information about file transfer activity, users who transfer files, filters, and more.
Organization: View information about Skype users, archive policies, environment, and more.
Accessing Skype for Business reports
To access these reports:
Go to the Skype for Business tab.
Click the category of report you're looking for and select the appropriate report.