Aastra Telecom SISIP 57I CT - Manual (Page 194)

Operational Features
5-66 41-001160-00, Rev 01 Release 2.0
IP Phone Administrator Guide
Operational IP Phone Features
Aastra Web UI
1 Click on Operation->Programmable Keys.
2 Select a hard key to configure.
3 In the "Type" field, select "do not disturb".
Note: You do not need to set the "Value" for DND. DND is applied to the hard key only.
4 Click to save your changes.
You must restart your IP phone for the changes to take affect.
5 Click on Operation->Reset.
6 In the "Restart Phone" field click to restart the IP phone and apply the changes.