Yealink SIP-T48U Administrator's Guide

Using Handsets with T57W/T54W/T53W/T53 Phones
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Handset Wallpaper
Wallpaper is an image used as the background for the handset idle screen. Users can select an image from hand-
set’s built-in background.
Topic
Handset Wallpaper Configuration
Handset Wallpaper Configuration
The following table lists the parameter you can use to configure the handset wallpaper.
Parameter
custom.handset.wallpaper <y0000000000xx>.cfg
Description
It configures the wallpaper displayed on the handset LCD screen.
Note: It will take effect on all handsets that are registered on the same phone. It works only if “stat-
ic.auto_provision.handset_configured.enable” is set to 1 (Enabled).
Permitted
Values
1-Wallpaper1
2-Wallpaper2
3-Wallpaper3
4-Wallpaper4
5-Wallpaper5
Default
-1, do not change the wallpaper set on each handset.
Supported
Devices
W53H, W56H
Handset UI
OK > Settings > Display > Wallpaper
Handset Screen Saver
The screen saver of the handset is designed to protect your LCD screen. You can enable the screen saver to pro-
tect the LCD screen, an analog clock will be activated and appear on the LCD screen after the handset is idle for
approximately 10 seconds.
It is only applicable to W56H/W53H handsets.
Topic
Handset Screen Saver Configuration
Handset Screen Saver Configuration
The following table lists the parameter you can use to configure the handset screen saver.
Parameter
custom.handset.screen_saver.enable
[1]
<y0000000000xx>.cfg
Description
It enables or disables screen saver feature.
Note: It will take effect on all handsets that are registered on the same phone. It works only if “stat-
ic.auto_provision.handset_configured.enable” is set to 1 (Enabled).
Permitted
Values
-1-Do not modify the configuration.
0-Disabled
1-Enabled, an analog clock will be activated and appear on the LCD screen if no user activity is
sensed for approximately 10 seconds.

Yealink SIP-T48U Specifications

General

Handset type	Wired handset
Product type	IP Phone
Product color	Gray
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Security algorithms	AES, HTTPS, SRTP, TLS
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Front camera	-
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Keypad number of keys	29
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Width	226 mm
Height	185 mm