48 Model 53i IP Phone User Guide
Line Keys and Programmable Keys

Do Not Disturb (DND) Key

The IP phones have a feature you can enable called "Do not Disturb (DND). The
DND function allows you to turn "do not disturb" ON and OFF.
If DND is ON, callers calling into the phone hear a busy signal or a message,
depending on how your System Administrator set up the configuration server. The
second line on the screen of the IP phone shows when DND is set.
If the phone shares a line with other phones, only the phone that has DND configured
is affected.
You can set DND on the programmable keys using the Aastra Web UI only. DND is
not configurable from the IP phone UI.
Configuring a DND Key
1. Click on Operation->Programmable Keys.
or
Click on Operation->Expansion Module <N>.
2. Select a "Key 3" through "Key 6".
3. In the "Hard Key" field, select do not disturb to apply to the programmable key.
4. Click to save your changes.
Note: You can configure DND using the Aastra Web UI only.
Aastra Web UI