Turning Do Not Disturb On and Off

You can activate the do not disturb function if you do not want the receive any calls. When do not disturb is activated, internal callers hear a busy signal and external callers are rerouted to a telephone assigned for this purpose (System Support). 

Step by Step
	Lift the handset.
or	Enter the code for "on" or "off".    When you lift the handset, a special dial tone (continuous buzzing) reminds you that "do not disturb" is active.  Authorized internal callers can automatically override the "do not disturb" function after five seconds.