Panasonic KX-TD500 System Reference Manual page 699

<Type 2>
This function field is available for Inter Office-Calling.
Type 2
F1
(LOOP & TRG)
F2 F3
(
( )
F7
(Call)
F8
(Function Select)
<Type 3>
This function field is available for concluding the Busy Lamp Type screen and
moving to the screen corresponding to the selected function key.
Type 3
F1
(LOOP & TRG)
F3
(Speed Dial)
F4
(Extension Directory)
F5
(Call Park)
F7
(Help)
F8
(Function Select)
F4 F5
) ( ) ( )
LOOP & TRG
screen
Speed Dial
screen
Extension Directory
screen
Call Park
screen
Help
screen
Type 1
LOOP & TRG
screen
Move the cursor onto the desired extension for
Inter Office Calling.
Calling the extension selected by the cursor.
Type 3
6-C-11