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The Do Not Disturb or (DND) function prevents calls from ringing an extension for which DND is activated. Some of the Do Not Disturb (DND) attributes include directing the call to a pre-assigned extension (like a secretary or assistant), busy signal, DND signal, or recorded message generated by the telephone switch. Some switches allow the call to go through to the extension but restrict the response to a visual indication.

DND can be operated through the Cooler Master PBX web portal or by pressing the DND button on your Cool Telecom telephone.