Cortelco 2757 - Manual (Page 49)

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3. Press ‘Up’ or ‘Down’ until ‘2. Ring Type’ is selected, then press ‘Select’.
4. All available ring tones will be listed here. Use ‘Up’, ‘Down’, and ‘Select’ key to choose a
ring tone. Press ‘Exit’ to return to the previous menu after making a selection. A ‘V’ will
appear on the currently selected ring tone.
3.9 Adjust the Contrast of LCD Screen
1. Press ‘Menu’