Cortelco CP4400 - Manual (Page 9)

9
Set the Display Contrast
1 With the phone on hook, press the MUTE button. The screen will display 1.
SET DATE
2 Press the VOL+ button twice. The screen will display 3 LCD BRIGHT.
3 Press the MUTE button. The screen will display BRIGHT and a series of “1”
representing the display contrast.
4 Use VOL+ and VOL- to adjust the display contrast.
5 Press the MUTE button. The screen will display 3 LCD BRIGHT.
6 Wait a few seconds and the screen will go to idle and display the date and
time
Set the Interface
1 With the phone on hook, press the MUTE button. The screen will display 1.
SET DATE
2 Press the VOL+ button three times. The screen will display 4 INTERFACE.
3 Press the MUTE button. The screen will display USB PSTN. Insure that
PSTN is blinking.
4 Press the MUTE button. The screen will display 4 INTERFACE.
5 Wait a few seconds and the screen will go to idle and display the date and
time.