Yealink SIP-T48U Administrator's Guide

Table of Contents
7
Contrast
197
Contrast Configuration
197
Wallpaper
198
Wallpaper Configuration
198
Wallpaper Customization
199
Custom Wallpaper Picture Limit
200
Custom Wallpaper Configuration
200
Deleting a Custom Picture
200
Adding a Wallpaper from a USB Flash Drive
200
Example: Setting a Custom Picture as Wallpaper
201
Transparency
201
Transparency Configuration
201
Screen Saver
202
Screensaver Display Customization
202
Screensaver File Elements and Attributes
203
Customizing the Screen Saver File
203
Custom Screensaver Picture Limit
204
Screensaver Configuration
204
Adding a Screensaver Picture from a USB Flash Drive
207
Deleting a Screensaver Picture
207
Backlight
207
Supported Backlight Options
208
Backlight and Time Configuration
208
Label Length for Line Key Display
209
Label Length Display Configuration
210
Label Alignment for Line/Ext Key Display
211
Label Alignment Display Configuration
211
Page Switch Key
212
Page Switch Key Configuration
212
Page Tips
212
Phone Page Tips
212
Phone Page Tips Indicator
212
Phone Page Tips Configuration
213
Expansion Module Page Tips
213
Expansion Module Page Tips Indicator
214
Expansion Module Page Tips Configuration
214
Time and Date
214
Time Zone
215
NTP Settings
218
NTP Configuration
218
DST Settings
220
Auto DST File Attributes
220
Customizing Auto DST File
221
DST Configuration
222
Time and Date Manually Configuration
223

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