Yealink SIP-T48G Administrator's Manual page 80

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
120-120s
300-300s
600-600s
1800-1800s
For SIP-T22(P):
0-Always on
1-Always off
15-15s
30-30s
60-60s
120-120s
If it is set to 60 (60s), the intensity of the LCD screen will be changed when the IP
phone has been inactive for 60 seconds.
For SIP-T48G:
The default value is 0.
For T22(P):
The default value is 30.
Web User Interface:
Settings->Preference->Backlight Time(seconds)
Phone User Interface:
Menu->Settings->Basic Settings->Backlight->Backlight Time
To configure backlight via web user interface (take SIP-T22P IP phones for example):
1. Click on Settings->Preference.
2. Select the desired value from the pull-down list of Backlight Time(seconds).
3. Click Confirm to accept the change.
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