The video below from Microsoft demonstrates how you can create connected teams that work better together with Office 365 and Skype for Business. Adding telephony means you can reduce reliance on costly PBX systems and transition to the cloud, but this is only directly available from Microsoft in the US.
If you are based in Europe and are interested in adding telephony in the same way there is good news. The Benemen Cloud based PBX provides you with the ability to make and receive traditional phone calls in Office 365 from your Skype for Business client or Benemen Softphone and manage these calls with traditional phone system features. The service is built on the proven enterprise voice technology available in Lync Server and Skype for Business Server.
If you would like an informal chat about adding telephony to your Office 365 then contact me, Dave Clarke, via this link and I'll be in touch.