AASTRA 4422 IP Office for BusinessPhone User Guide - Manual (Page 115)

115 BusinessPhone – Dialog 4422 IP Office
Installation
Wall Mounting
The phone can be wall mounted, useful for instance in conference
rooms or public areas.
1 Use a screwdriver to remove the handset hook.
2 Turn the hook upside down and insert.
3 Use a screwdriver to remove the three plastic covers.
4 Drill wall holes according to measure.