Yealink T40G Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
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Backlight time includes the following settings you can choose from:
 Always On: Backlight is on permanently.
 Always Off: Backlight is off permanently. It is not available for the
T54S/T52S/T48S/T48G/T46S/T46G/T29G IP phone.
 15s, 30s, 1min, 2min, 5min, 10min or 30min: Backlight is changed when the phone is inactive after
the designated time (in seconds).
Topics
Supported Backlight Options
Backlight Brightness and Time Configuration
Supported Backlight Options
The following table lists available configuration options to configure the backlight of phone
models/expansion modules:
Phone Model (and
the connected
expansion module)
Configuration Options
T54S/T52S(EXP50)
T48S/G(EXP40)
T46S/G(EXP40)
T29G(EXP20)
Inactive Level (not applicable to EXP50)
Active Level
Backlight Time (not applicable to EXP50)
T27P/G(EXP20)
Active Level
Backlight Time
T42S/G
T41P/S
T40P/G
T23P/G
T21(P) E2
Backlight Time
Backlight Brightness and Time Configuration
The following table lists the parameters you can use to configure screen backlight brightness and time.
Parameter
phone_setting.active_backlight_level
<y0000000000xx>.cfg
Description
It configures the intensity of the LCD screen when the phone is active.
Note: It is applicable to the T54S/T52S/T48S/T48G/T46S/T46G/T29G/T27P/T27G IP
phone. If expansion module is connected, the backlight on expansion module

Yealink T40G Specifications

General

SIP Accounts	3
Wall Mountable	Yes
Opus Codec	No
Display	2.3 inch 132x64-pixel graphical LCD
Network	Dual-port Gigabit Ethernet
PoE	Yes
Headset Support	Yes, RJ9 port
Power Adapter	Optional
Voice Codecs	G.722, G.711(A/μ), G.729AB, G.726
Local Phonebook	1000 entries