AASTRA 4425 IP Vision (SIP) for MX-ONE User Guide - Manual (Page 124)

125 Dialog 4425 IP Vision
Installation
Install key panels
1 Fasten the connector in the bottom of the hole using a
finger or a blunt tool. Make sure the connector fits before
pressing it down.
2 Press where the arrows are pointing, until you hear a
“Click” sound.
3 Install the stands as shown in the picture in section
“Stand positioning”.
Notes:
All key panels must be of type DBY 419 01.