Once you want to use Teams also as your cloud PBX you can come into very interesting decision point while talking about the need of the license for your users. In old times almost all people had telephone by default. Nowadays this need can be already diminished by scheduled calls and using meeting platforms or by adhoc native Teams calls even between federated users.
So do all my people need to be enabled for Enterprise Voice? Do they need to be licensed with Phone System? What about receptionist transferring PSTN calls to users? Will that work? How does the Teams phone device is licensed? What about Auto-attendant and Call Queues? When do I need to assign license to resource account and to users? Do I even need to have Direct Routing or Calling Plan for my use case? What about dialing out from meeting?
Beside answering those quite common questions I will also present real use cases and personas which we have identified during our deployments of Teams Telephony in HeidelbergCement.