Panasonic KX-TDA150 User Manual page 26

1.1.1 Before Operating the Telephones
Button
Cleaned-up
Primary Directory Number
(PDN)
Secondary Directory Number
(SDN)
26 User Manual
Used to switch the room status of extensions between Ready and Not
Ready.
Used to make and receive both outside and intercom calls.
Used to show the current status of another extension, call the extension,
and pick up or transfer calls to it.
Feature