One acronym you’ll see a lot in the UM world is “class of service”, or CoS. A class of phone service is just a set of options– think of it like a group policy object. The Mitel 3300 lets you define multiple CoS objects, then assign them in various combinations. For example, you can define a day CoS that has one set of behaviors, then a night CoS that acts completely differently (perhaps it turns off inbound ringing, or disallows all outbound non-emergency calls). You can define multiple CoS objects and assign them to different extensions, and there are different types of CoS for handsets, trunks, and other various types of objects.
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