AASTRA 4422 IP Office for BusinessPhone User Guide - Manual (Page 116)

Installation
BusinessPhone – Dialog 4422 IP Office 116
5 Mount spacer(s) according to measures.
Option 1 is recommended. Spacer(s) are not supplied.
6 Mount screws according to measures and attach the
phone.
Spacer, option 1 Spacers, option 2
Two upper screws
and spacer
One lower screw
and spacer