Microsoft Teams does not include telephony by default, requiring businesses to add solutions like Microsoft's Calling Plans or Direct Routing. Direct Routing, which allows connection to third-party carriers, is the most popular method, offering greater flexibility, cheaper call rates, and better support than Microsoft's plans. However, it requires technical expertise and equipment like session border controllers (SBCs). Managed services such as Direct Routing-as-a-service help SMBs overcome these challenges by handling infrastructure and offering enhanced PBX features, security, and 99.999% uptime​.

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