The Yealink T20 handset doesn't have a button for DND like most phones. To enable or disable DND you have to go through the menu options.

  1. Press the Menu button
  2. Select option 1 (Call Control)
  3. Select option 4 (Do Not Disturb)
  4. Use the Left & Right arrows to toggle between Enabled/Disabled
  5. Then press OK to save


Notes:

  • The DND will be highlighted at the top of the LED display when enabled
  • DND = Do Not Disturb