AASTRA 4422 IP Office for BusinessPhone User Guide - Manual (Page 112)

Installation
BusinessPhone – Dialog 4422 IP Office 112
Install card
Use the Designation Card Manager to make and print your own
designation cards. The Designation Card Manager is included on
the Enterprise Telephone Toolbox CD or it can be downloaded
from:
http://www.aastra.com/enterprise/library/manuals.shtml
For questions regarding the product, please contact your Aastra
Certified Sales Partner.
Install key panel (optional)
(Dialog 4422 v. 2 IP Office phone only).
1 Remove the small plastic plate, marked DSS, i.e. with a
screwdriver and connect the cable.
2 Attach key panel unit.