Setting Do Not Disturb
Use the Do Not Disturb feature to prevent incoming calls from ringing your phone. If you have voice mail configured, incoming callers can be immediately routed to voice mail.
If voice mail is not configured, callers will hear a busy signal or a message.
To activate press the button 'dnd'
After you activate the dnd the display show Do Not Disturb
To deactivate press the '-dnd' button