Quality of Service (QoS) is a mechanism that lets you prioritize certain types of network traffic. Prioritizing the traffic for real-time communications services such as Teams is important in order to deliver a business-grade user experience. For QoS to be truly effective, a QoS-capable connection must be configured end-to-end (PC, network switches, and routers to the cloud), because any part in the path that fails to support QoS could degrade the quality of the entire call.
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