Easy Customization and High Expansibility
The SIP-T48U has a seven-inch, 800 x 480-pixel, backlit- color touch screen, which enables a rich
visual presentation and easy navigation. Accompanied by two USB ports, the T48U is your
right-hand man in the office that makes Bluetooth, Wi-Fi, USB headset and USB recording possible,
and you can use any two of them freely according to your needs to enrich phone features.
Meanwhile, the phone not only has 29 one-touch DSS keys that can be easily programmed to
various features, but also can connect up to three expansion modules, for up to 180 additional
buttons with a screen-based LCD display and LED system.

HD Audio
Yealink Optima HD Voice technology combines cutting-edge hardware and software with
wideband technology for maximum acoustic performance. Being a totally open, highly versatile
audio codec, Opus, is designed to perform a higher HD audio quality than other wideband codecs
in a high network bandwidth; However, if your current network quality is poor, Opus can provide
you with a better audio quality than other narrowband codecs. And its hearing aid compatible
(HAC) handset helps the person who is with hearing loss to hear the voice more clearly.

Efficient Installation and Provisioning
Yealink T4U series supports efficient provisioning and effortless mass deployment with Yealink’s
Redirection and Provisioning Service (RPS) and Boot mechanism to help you realize the Zero Touch
Provisioning without any complex manual settings, which makes the T4U series simple to deploy,
easy to maintain and upgrade. Furthermore, a unified firmware and auto-p template that applies
to all T4U phone models (T41U, T43U, T46U and T48U), saves even more time and costs for
businesses, as well as simplifies the management and maintenance.

Secure Transport and Interoperability
The SIP-T48U uses SIP over Transport Layer Security (TLS/SSL), which is the latest network security
technology. It’s also compatible with leading soft switch suppliers, such as 3CX, Broadsoft
Broadworks.

Specification

Product
Product id	819248
Brand	Yealink Network Technology
Partnr	SIP-T48U
EAN/UPC code	6938818304321
Technical details
Expansion module support	Y
Keypad number of keys	29
Speakerphone	Y
Display
Display	LED
Display resolution	800 x 480 Pixels
Display diagonal	7 inch
Backlight display	Y
Touchscreen	Y
Phone features
Caller ID	Y
Redialing	Y
Conference call	Y
Call forwarding	Y
Call hold	Y
Number of VoIP accounts	16
Call waiting	Y
Phonebook capacity	1000 entries
Audio
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Network
Bluetooth	Y
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN	Y
Ethernet LAN interface type	Gigabit Ethernet
Wi-Fi	Y
Security
Security algorithms	AES, HTTPS, SRTP, TLS
Ports & interfaces
Ethernet LAN (RJ-45) ports	2
USB 2.0 ports quantity	2
Power
AC adapter input voltage	100 - 240 V
Power over Ethernet (PoE)	Y
Design
Product type	IP phone
Handset type	Wired handset
Weight & dimensions
Width	226 mm
Depth	226 mm
Height	185 mm
Colour
Product colour	Grey
Operational conditions
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 procent
Packaging content
Number of handles included	1 stuk(s)
Logistics data
Harmonized System (HS) code	85171800