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Adjust you IP Phone 2004 display contrast
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3. Press the left-most bottom button to decrease the contrast of your
display. Press the next button to the right to increase the contrast of
your display. The percentage figure decrease/increases depending
on how long you press the corresponding button.
4. When you find the contrast you like, press the Ok button to save the
change. Otherwise, press the Cancel button to return the previously
saved contrast.