Panasonic KX-NS500 Features Manual page 250

2.21.1 Fixed Buttons
Flexible DSS (Direct Station Selection)
PF (Programmable Feature)
Conditions
•
Certain buttons are equipped with a light to show line or feature status.
250 Feature Guide
Button
Used to access an extension with one touch. Every
button is programmed to correspond to an extension.
DSS buttons can also be reassigned to other features.
Used to access a preprogrammed feature with one
touch. (no default)
Usage