What are the different Enterprise solutions available in Teams?
Microsoft provides complete Private Branch Exchange (PBX) capabilities for your organization through a Phone System. However, to enable users to make calls outside your organization, you need to connect the Phone System to the Public Switched Telephone Network (PSTN).
This article focuses on PSTN connectivity options. For more information about Microsoft voice solutions, including details about Phone System features, see Plan your Teams voice solution.
To connect the Phone System to the PSTN, you can choose from the following options:
Calling Plan. An all-in-the-cloud solution with Microsoft as your PSTN carrier.
Operator Connect. With Operator Connect, if your existing carrier participates in the Microsoft Operator Connect program, they can manage PSTN calling and Session Border Controllers (SBCs).
Teams Phone Mobile. With Microsoft Teams Phone Mobile, a user’s SIM-enabled phone number is also their Teams phone number. If your existing carrier participates in the Microsoft Teams Phone Mobile program, they can manage the service for bringing PSTN calling to Teams.
Direct Routing, which enables you to use your own PSTN carrier by connecting your Session Border Controller(s) (SBC) to Phone System.

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