Microsoft Teams utilizes SIP for Direct Rouging. Different communication apps like Chat, Meetings, and Calling are all exposed through UX App Window. However, Teams require IP-based voice connections, so SIP would serve the purpose. Direct Routing requires SIP Trunks. One of the prerequisites for Teams Direct Routing is that the company must be equipped with a SIP Trunk through a Communications Service Provider. It acts as a telephony network provider for Direct Routing setup. If a new Provider is needed, the existing phone numbers can be ported to the new provider.
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