Yealink SIP-T48U Administrator's Guide

Using Handsets with T57W/T54W/T53W/T53 Phones
145
Default
1
Supported
Devices
All handsets except DD phones
Parameter
over_the_air.base_trigger <y0000000000xx>.cfg
Description
It enables or disables to upgrade the handset firmware compulsively when the phone detects a new
handset firmware from the provisioning server.
Permitted
Values
0-Disabled, if “over_the_air.handset_tip” is set to 1 (Enabled), it will pop up a tip on the handset to
notify the user to confirm upgrading the firmware or not. If “over_the_air.handset_tip” is set to 0, you
may go to Settings > Upgrade Firmware on the handset to trigger the upgrading manually.
1-Enabled, it will upgrade the handset firmware compulsively without a pop-up tip on the handset.
Default
1
Parameter
over_the_air.url.w52h <y0000000000xx>.cfg
Description
It configures the access URL of the W52H handset firmware file.
Note: The priority of parameter “over_the_air.url.w52h” is higher than “over_the_air.url”.
Permitted
Values
URL within 511 characters
Default
Blank
Parameter
over_the_air.url.w53h <y0000000000xx>.cfg
Description
It configures the access URL of the W53H handset firmware file.
Note: The priority of parameter “over_the_air.url.w53h” is higher than “over_the_air.url”.
Permitted
Values
URL within 512 characters
Default
Blank

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