AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 111)

111 BusinessPhone — Dialog 4223 Professional / Dialog 3213
Accessories
Accessories
This chapter describes optional features that can be used together
with your BusinessPhone telephone.
Expansion key panel
Dialog 4223 Professional
Each key panel offers 17 additional keys for storing of your most
frequently used telephone numbers and functions, and for
supervising extensions. Your telephone can be expanded with up
to four key panels.
Note: For the Dialog 4223 Professional, you need the
optional key panel DBY 419 01.
Dialog 3213 Executive
Each key panel offers 17 additional keys for storing of your most
frequently used telephone numbers and functions, and for
supervising extensions. Your telephone can be expanded with up
to four key panels.
Note: If one or two key panels are used, the optional key
panel DBY 409 01 may be used. However, if three or four
key panels are used, all optional key panels must be of type
DBY 409 02.