Yealink SIP-T31G Administrator's Guide

Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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Inactive Level: The brightness of the LCD screen when the phone is inactive. You can select a low brightness or
turn off the backlight.
Backlight Time: The delay time to change the brightness of the LCD screen when the phone is inactive. Backlight
time includes the following settings you can choose from:
l
Always On: Backlight is on permanently.
l
Always Off: Backlight is off permanently. It is not available for the
T57W/T54W/T48U/T48S/T48G/T46U/T46S/T46G/T29G/T33P/T33G IP phone.
l
15s, 30s, 1min, 2min, 5min, 10min or 30min: Backlight is changed when the phone is inactive after the des-
ignated time (in seconds).
Topics
Supported Backlight Options
Backlight and Time Configuration
Supported Backlight Options
The following table lists available configuration options to configure the backlight of phone models/expansion mod-
ules:
Phone Model (and the connected
expansion module)
Configuration Options
T57W(EXP50)
T54W(EXP50)
T48U(EXP43)
T48S/G(EXP40)
T46U(EXP43)
T46S/G(EXP40)
T33P/T33G
T29G(EXP20)
Inactive Level (not applicable to EXP50/EXP43)
Active Level
Backlight Time (not applicable to EXP50/EXP43)
T53W/T53(EXP50)
T43U(EXP43)
T31P/T31G/T31
T27G(EXP20)
T42U
Active Level
Backlight Time (not applicable to EXP50/EXP43)
T42S/G
T41P/S
T40P/G
T23P/G
T21(P) E2
CP920
Backlight Time
Backlight and Time Configuration
The following table lists the parameters you can use to configure screen backlight and time.

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm