Use call blocking to select which other users can get through to your badge. You can choose to accept or block calls from any user or group. For example, you might choose to accept only calls from certain individuals if you are in a meeting.
Like DND mode, Call Blocking prevents other users from reaching you. It gives you more flexibility than DND, however, because you can select exactly the users or groups of users you want to block or accept. Also, whereas DND mode automatically ends the next time you press the Call button, your Call Blocking settings remain effective until you explicitly change them.
The Call Blocking page has two lists: one for people whose calls you want to accept, and one for people whose calls you want to block. The Call Blocking Default setting list applies to people who does not appear in either list.