2N Helios IP Configuration Manual page 54

Backlight level – set the keypad and button backlight level.
Keyboard Mapping
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The 2N Helios IP Audio Kit and 2N Helios IP Video Kit models are equipped
with eight terminals for up to 16 external buttons or a keypad. The functions can be set
for each button separately.
The buttons and their settings are arranged in a matrix of 4 columns x 4 rows; see the
figure below.
The figure below shows the default button settings.
You can assign one function to each matrix position: numeric keypad keys 0 through 9,
*, # or one of the quick dial buttons 1–16.
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