The below steps will show you how to enable and disable Do-Not disturb on the avaya J100 Series Phone

1. From the Home-Screen select Features>>Call Settings>>.

2. Select the Do Not Disturb option then press the left or right keypad button on your phone to switch the option on or Off.

3. Then click on Save to keep the changes.

4. Exit the menu and you will notice black stop icon on your home screen