How do I add DND to a Line Key? You are here: KB Home Portal - Administrator Line Key Features How do I add DND to a Line Key? < Back 1. From the side menu click Extensions2. Edit the extension you want to add DND3. Click Device tab then from the Line Keys select the appropriate key you want to configure From line key drop down select DND4. Once you are done configuring line keys then click Update Previous How do I add Call Park to a Line Key? Next How do I add Speed Dial to a Line Key?