Microsoft 365 Fundamentals MS-900 Practice Question

The correct answer is Direct Routing. This option allows an organization to connect its own on-premises telephony infrastructure, such as a Session Border Controller (SBC), and its existing telecommunications carrier to Microsoft Teams Phone. Microsoft Calling Plan is an all-cloud solution where Microsoft provides the phone numbers and acts as the carrier. Operator Connect is a model where certified third-party operators provide PSTN connectivity directly in the cloud, without using customer-owned on-premises hardware. Audio Conferencing allows users to dial in to meetings from a phone but does not provide individual users with general PSTN calling capabilities.