AASTRA 4425 IP Vision for BusinessPhone User Guide - Manual (Page 141)

141 BusinessPhone – Dialog 4425 IP Vision
Installation
3 Insert the pullout leaf.
Wall mounting handset hook
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.