Yealink SIP-T4X Administrator's Manual page 54

Administrator's Guide for SIP-T4X IP Phones
7. Select the desired value from the pull-down list of Talk/Dial Power Light On.
8. Click Confirm to accept the change.
Contrast determines the readability of the texts displayed on the LCD screen. Adjusting
the contrast to a comfortable level can optimize the screen viewing experience. When
configured properly, contrast allows users to read the LCD's display with minimal
eyestrain. For SIP-T48G and T46G IP phones, you can only configure the LCD's contrast of
the connected EXP40. Make sure the expansion module has been connected to the IP
phone before adjustment.
Procedure
Contrast can be configured using the configuration files or locally.
Configuration File
Local
38
<y0000000000xx>.cfg
Phone User Interface
Configure the contrast of the LCD
screen.
For more information, refer to
Contrast on page 267.
Configure the contrast of the LCD
screen.