Calling Plan Overview

Calling Plan provides Microsoft-hosted public switched telephone network (PSTN) connectivity for Teams in conjunction with the Phone System service. This illustration shows that the Teams Service, Phone System private branch exchange (PBX) functionality, and Calling plan PSTN service are hosted by Microsoft when Calling Plan is utilized. Microsoft acts as the PSTN service provider, offering connectivity to place and receive conventional phone calls. Phone System, in turn, provides PBX services such as call management, routing, and voice mail for users of the Teams service.

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