Yealink SIP-T31G Administrator's Guide

Phone Customization
198
X starts from 14, “name” is replaced with the language name
Default
Blank
Parameter
wui_lang.delete <y0000000000xx>.cfg
Description
It deletes the specified or all custom web language packs and note language packs of the web user
interface.
Permitted
Values
http://localhost/all or http://localhost/Y.name.js
Y starts from 014, “name” is replaced with the language name
Default
Blank
Contrast
Contrast determines the readability of the texts displayed on the LCD screen. Adjusting the contrast to a com-
fortable level can optimize the screen viewing experience.
You can adjust the contrast for T53W/T53/T43U/T40P/T40G/T31P/T31G/T31/T30P/T30/T27G/T23P/T23G/T21(P)
E2/T19(P) E2/CP920 phones, or for expansion module EXP20 (connected to T29G/T27G phones), EXP40 (con-
nected to T48S/T48G/T46S/T46G phones).
Topic
Contrast Configuration
Contrast Configuration
The following table lists the parameters you can use to adjust contrast for the phone.
Parameter
phone_setting.contrast <y0000000000xx>.cfg
Description
It configures the contrast of the LCD screen.
For T53W/T53/T43U/T31P/T31G/T31/T30P/T30/T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2 phones,
it configures the LCD's contrast of the IP phone.
For T48S/T48G/T46S/T46G phones, it configures the LCD’s contrast of the connected EXP40 only.
For T29G phones, it configures the LCD’s contrast of the connected EXP20 only.
For T27G phones, it configures the LCD’s contrast of the IP phone and the connected EXP20.
Note: We recommend that you set the contrast of the LCD screen to 6 as a more comfortable level.
Permitted
Values
Integer from 1 to 10
Default
6
Supported
Devices
All phones except T57W, T54W, T48U, T46U, T42G, T42S, T42U, T41P, T41S, T33P and T33G
Web UI
Black-and-white Screen Phones:
Settings > Preference > Contrast
Phone UI
Color Screen Phones:
Menu > Basic > Display > Contrast
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Contrast

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