Panasonic KX-T336 System Reference Manual page 1038

The DN-01 through 03 buttons are assigned as the PDN buttons automatically.
The DN-01 button is fixed to a PDN button and cannot be changed to another
assignable feature button.
The PDN buttons assigned to the DN-02 and 03 buttons can be changed to an-
other assignable feature button and vice versa.
When two or three PDN buttons are used, they must be arranged consecutively.
For example, it is not possible to program as follows:
Type
To select this screen, press the NEXT key in the "Extension-Station (1/3)"
screen.
DN-03
PDN
DN-02
SDN
DN-01
PDN
ICM
(DN buttons on PITS type 20, 30 and 50)
If "PRV-CO" (Private CO) is selected, a physical number of the selected
CO line must be programmed in "Number."
The CO line of the physical number belongs to a "Trunk-CO Line", Trunk
Group.
The trunk group where the CO line belongs must have "Group-Trunk
Group", Type assigned to "PVL" (Private Line).
If "Single CO" is selected, a physical number of the selected CO line must
be programmed in "Number."
The CO line of the physical number belongs to a "Trunk-CO Line", Trunk
Group. The trunk group of the CO line must have "Group-Trunk Group",
Type assigned to "DDD" or "FEX" or "WATS", or "PBX."
If "Group CO" is selected, a trunk group number of the selected trunk
group must be programmed in "Number."
The programmed trunk group must have "Group-Trunk Group", Type
assigned to "DDD" or "FEX" or "WATS" or "PBX."
9-G-10
(30393)
PDN SDN
PDN
DN-3 DN-2 DN-1
(DN buttons on PITS 7000 series)