Aastra Dialog 4223 Professional User Manual page 147

Installing Your Extension
148
Installing Your Extension's Support Feet,
and Adjusting the Angle
Your extension is equipped with two support feet that have two
possible installation angles, depending on the angle you prefer for
your extension.
To install the support feet, push them into the underside of your
extension to the desired angle, then push in the tab to hold their
position.
If you wish to remove the support feet, pull on the tab to release
them before removing the feet from the extension.
MD Evolution – Dialog 4223 Professional