Microsoft Teams Phone is the telephony capability of Microsoft Teams: a cloud private branch exchange (PBX) within the Microsoft 365 environment. Calls between Teams users in an organisation are handled within Teams by default; with Teams Phone, users can also make and receive domestic and international telephone calls. It includes features such as auto attendants and call queues, and works in all Teams clients and on certified third-party desk phones. A licence grants access to the telephone network, but the PSTN connection and phone numbers come from a separate operator or Microsoft solution.
Microsoft Corporation is headquartered in Redmond, Washington, and is subject to US jurisdiction, including the CLOUD Act. For Microsoft 365 customers with a sign-up location in the EU or EFTA, the EU Data Boundary applies, within which Microsoft stores and processes customer data and personal data in the EU or EFTA, with limited exceptions; Multi-Geo customers are outside it. That overview does not list Teams Phone separately. The PSTN provider is a separate processing domain.