Yealink SIP-T2 SERIES Administrator's Manual page 159

Description:
Configures the delay time (in seconds) to change the intensity of the LCD screen when the IP
phone is inactive.
0-Always On
1-Always Off (not applicable to SIP VP-T49G/SIP-T48G/T46G/T29G IP phones)
15-15s
30-30s
60-60s
120-120s
300-300s
600-600s
1800-1800s
If it is set to 60 (60s), the intensity of the LCD screen will be changed when the IP phone has
been inactivated for 60 seconds.
For SIP VP-T49G/SIP-T48G/T46G/T42G/T41P/T29G/CP860:
The default value is 0.
For SIP-T40P/T27P/T23P/T23G/T21(P) E2:
The default value is 30.
Note: It is not applicable to SIP-T19(P) E2 IP phones.
Web User Interface:
Settings->Preference->Backlight Time(seconds)
Phone User Interface:
Menu->Settings->Basic Settings->Display->Backlight->Backlight Time
To configure backlight via web user interface (take SIP-T23G IP phones for example):
Click on Settings->Preference.
1.
Select the desired value from the pull-down list of Backlight Time(seconds).
2.
Configuring Basic Features
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