Yealink SIP-T40G Administrator's Guide

Phone Customization
209
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Backlight > Active Level
Parameter
phone_setting.inactive_backlight_level <y0000000000xx>.cfg
Description
It configures the intensity of the LCD screen when the phone is inactive.
Note: If expansion module EXP20 or EXP40 is connected, the backlight on the expansion module
automatically changes to match this setting.
Permitted
Values
0-Off, it works only if “phone_setting.backlight_time” is not set to 1 (Always On).
1-Low
Default
1
Supported
Devices
All color screen phones
Web UI
Settings > Preference > Inactive Level
Phone UI
Menu > Basic > Display > Backlight > Inactive Level
Parameter
phone_setting.backlight_time <y0000000000xx>.cfg
Description
It configures the delay time (in seconds) to change the intensity of the LCD screen when the phone is
inactive.
Permitted
Values
0-Always On
1-Always Off (not applicable to color screen phones)
15-15s
30-30s
60-1min
120-2min
300-5min
600-10min
1800-30min
Default
T57W/T54W/T53W/T53/T48U/T48S/T48G/T46U/T46S/T46G/T43U/T29G: 0
T42G/T42S/T42U/T41P/T41S/T40P/T40G/T27G/T23P/T23G/T21(P) E2/CP920: 30
Supported
Devices
All phones except T19(P) E2
Web UI
Settings > Preference > Backlight Time(seconds)
Phone UI
Color Screen Phones:
Menu > Basic > Display > Backlight > Backlight Time
Black-and-white Screen Phones:
Menu > Settings > Basic Settings > Display > Backlight > Backlight Time
Label Length for Line Key Display
By default, the line key label only displays the first few characters when the length of the label exceeds the max-
imum length. You can specify the line key label length as needed. It is only applicable to color screen phones.
When label length feature is set to Default:

Yealink SIP-T40G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Wall mountable	Yes
Wi-Fi	No
Security algorithms	AES, HTTPS, SSL/TLS
Networking standards	IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	FTP, TFTP, HTTP, HTTPS
Voice codecs	G.711, G.711a, G.711u, G.722, G.726, G.729ab
RJ-11 ports quantity	1
Ethernet LAN (RJ-45) ports	2
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	1.6 W
Certification	CE, FCC, ISO 9001
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 90 %
Volume control	Digital
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Lines quantity	3 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	3
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	175 mm
Width	212 mm
Height	54 mm