Location of DN buttons is specific to each model as follows.
KX-T123220
KX-T30820
MESSAGE
(Message
Waiting) Button
and Indicator
DN (Directory
Number) Buttons
and Indicators
ICM (Intercom)
Button and
Indicator
KX-T61620
Number) Buttons
and lndlcators
DN3
DN2
DNl
DN (Directory
Number) Buttons
and Indicators
ICM (Intercom)
Button and
Indicator
ICM (lnterwm)
Buttonand
indicator
4-A-3