Snom 200 Administrator's Manual page 39

The selected ring tone is played back and you can decide on the
desired setting.
Key mapping:
Moves the cursor to the next ring tone.
Moves the cursor to the previous ring
tone.
Activates the selection and returns.
Returns without changing the ring tone.
Contrast
Select the submenu "Contrast" in the "General Settings" menu.
Here, the display contrast can be adjusted.
The selected contrast is displayed and you can decide on the
desired setting.
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