AASTRA 4225 Vision for MX-ONE (TSE) User Guide EN - Manual (Page 123)

123 Dialog 4223 Professional/Dialog 4225 Vision
Installation
Wall mounting
The phone can be wall mounted without using a special console. 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 two plastic covers.
4 Drill wall holes according to measurements given here.
5 Place screws according to measurements and mount the phone.