Do Not Disturb allows you to send your calls directly to your voicemail without ringing your phone; although, you can allow important calls to get through. If you wish, you can also prompt callers: "The party you have reached has currently requested not to be disturbed. Press 1 if you would still like to connect to your party's line or press 2 to leave a message." 

How it works:

Do Not Disturb is disabled by default. To turn Do Not Disturb on/off:

• Pick up your phone
• After you hear the dial tone, dial *3 and hang up the phone