Do Not Disturb is a form of termination restriction associated with an automatic deactivate time. When Do Not Disturb is active, the user receives only those calls associated with Automatic Callback, Automatic Wakeup, and Priority Calling, and those calls that are redirected to that extension via the Call Coverage and Call Forwarding All Calls. All other calls redirect to a recorded announcement, an attendant, or intercept tone. Communication Manager can be set to give a special dial tone whenever an analog set goes off-hook when Do Not Disturb is active.

Phone users with touch-tone dialing can activate this feature themselves or ask the front desk to do it for them. Users with rotary-dial phones must call the attendant or front-desk user to request Do Not Disturb.