Aastra Dialog 4425 IP Vision User Manual page 11

Installing Your Extension
Next, drill two holes that will hold your extension's wall mounting
screws. These screws should be in compliance with the diagrams
below, with a vertical distance of 100 mm between them.
9,5 mm
9—10 mm
max 5,5 mm
Now, simply insert the two wall mount screws into the holes on the
underside of your extension.
MD Evolution – Dialog 4425 IP Vision 11