3 guides
Understand Teams Phone licensing: what Teams Phone covers, when you need a Calling Plan, the free resource account license, and how PSTN options change what to buy.
Assign phone numbers to Teams users: the Teams Phone license you need, getting or porting numbers, Set-CsPhoneNumberAssignment, number types, and emergency address.
Pillar Guide
Compare Microsoft Calling Plan, Operator Connect, and Direct Routing for Teams Phone: cost, control, SBC needs, number porting, and which fits your organization.