Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
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3.
Press the Save soft key to accept the change.
Backlight determines the brightness of the LCD screen display, allowing users to read
easily in dark environments. Backlight time specifies the delay time to change the
intensity of the LCD screen when the IP phone is inactive.
Backlight turns off quickly if a
short backlight time is configured, this may not give users enough time to read
messages. Backlight time is applicable to
SIP-T48G/T46G/T42G/T41P/T29G/T27P/T23P/T23G/T21(P) E2 IP phones and EXP40
connected to SIP-T48G/T46G IP phones and EXP39 conneted to SIP-T29G/T27P IP phones.
You can configure the backlight time as one of the following types:
Always Off: Backlight is turned off permanently (not applicable to
SIP-T48G/T46G/T29G IP phones).
Always On: Backlight is turned on permanently.
15s, 30s, 60s, 120s, 300s, 600s or 1800s: Backlight is turned off when the IP phone is
inactive after a preset period of time (in seconds), but it is automatically turned on
if the status of the IP phone changes or any key is pressed.
Backlight Active Level is used to adjust the backlight intensity of the LCD screen when
the phone is active. Backlight Inactive Level is used to adjust the backlight intensity of
the LCD screen when the phone is inactive. Backlight Active Level is applicable to
SIP-T48G/T46G IP phones and the connected EXP40, SIP-T29G/T27P IP phones and the
conneted EXP39. Backlight Inactive Level is only applicable to SIP-T48G, SIP-T46G and
SIP-T29G IP phones.
Note
The following table lists available methods and configuration options to configure the
backlight of phone models.
Phone Model
Configuration Methods
Configuration Options
SIP-T48G/T46G/T2
9G
Configuration Files
Web User Interface
Phone User Interface
Backlight InActive Level
Backlight Active Level
Backlight Time
SIP-T27P
Configuration Files
Phone User Interface
Web User Interface
Backlight Active Level
Backlight Time
SIP-T42G/T41P/T23
P/T23G/T21(P) E2
Configuration Files
Web User Interface
Backlight Time
Before you adjust the LCD’s backlight of expansion module, make sure the expansion
module has been connected to the IP phone.
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