Skype for Business, formerly known as Lync, is a softphone technology, which is, in turn, a feature/component of IP telephony.This short tutorial explains how to use it on the Windows platform at CERN.
3:08 - How to call a regular phone number
3:59 - How to call a Skype for Business user at CERN
5:16 - How to create a Skype for Business meeting in Outlook
Existing MS material: