1.3 Call Forwarding (FWD)/Do Not Disturb (DND) Features34 Feature Guide1.3.1.3 Do Not Disturb (DND)DescriptionExtension users can use this feature to prevent calls from ringing at their extension. The calling extensionwill hear a Do Not Disturb (DND) tone.Conditions• DND OverrideAn extension in DND mode can be called by extensions that are allowed to override DND throughsystem programming ( DND Override [609]).• This feature does not apply to calls from Hold Recall, Camp-on Recall, and Timed Reminder.• Calls from outside (CO) lines programmed as "Normal" or "DIL" ( CO Line Mode—Day/Night/Lunch[414-416]) can be received at a user's extension, but the telephone will not ring. The corresponding CObutton will flash when an outside (CO) line call is received, and the user can answer the call by pressingthis button.User Manual References1.2.4 When the Dialled Party is Busy or There is No Answer1.7.2 Refusing Incoming Calls (Do Not Disturb [DND])