For SIP-T27P/T23P/T23G/T21(P) E2:
The default value is 30.
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):
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.
To configure backlight via phone user interface (take SIP-T23G IP phones for example):
1. Press Menu->Settings->Basic Settings->Display->Backlight.
2. Press or , or the Switch soft key to select the desired type from the
Backlight Time field.
3. Press the Save soft key to accept the change.
To configure the backlight via web user interface (take SIP-T46G IP phones for example):
1. Click on Settings->Preference.
2. Select the desired value from the pull-down list of Backlight Inactive Level.
3. Select the desired value from the pull-down list of Backlight Active Level.
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