The Gigaset range of Desk phones can be put on Do Not Disturb by pressing the 'DND' button on the phone as shown below: 




By pressing the DND button the key will be lit up you will not receive any calls and the phone will not ring. 


You can still make outgoing calls when the DND button is activated. 


How to take off DND?


Just press the DND button again to de-activate the DND function - the key will no longer be lit up.