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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.

Yealink SIP-T48U. Product type: IP Phone, Product color: Gray, Handset type: Wired handset. Phonebook capacity: 1000 entries. Display: LED, Display diagonal: 7", Display resolution: 800 x 480 pixels. Voice codecs: AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC. Ethernet LAN interface type: Gigabit Ethernet, Ethernet LAN data rates: 10,100,1000 Mbit/s, Security algorithms: AES, HTTPS, SRTP, TLS

Product type	IP Phone
Product color	Gray
Handset type	Wired handset
Caller ID	Yes
Phonebook capacity	1000 entries
Number of VoIP accounts	16
Call waiting	Yes
Call hold	Yes
Call forwarding	Yes
Conference call	Yes
Redialing	Yes
Keypad number of keys	29
Touchscreen	Yes
Display	LED
Display diagonal	7"
Display resolution	800 x 480 pixels
Backlight display	Yes
Speakerphone	Yes
Voice codecs	AGC, AJB, AMR-WB, CNG, G.711, G.722, G.723.1, G.726, G.729ab, VAD, iLBC
Ethernet LAN	Yes
Wi-Fi	Yes
Bluetooth	Yes
Ethernet LAN interface type	Gigabit Ethernet
Ethernet LAN data rates	10,100,1000 Mbit/s
Security algorithms	AES, HTTPS, SRTP, TLS
USB 2.0 ports quantity	2
Ethernet LAN (RJ-45) ports	2
Expansion module support	Yes
Power over Ethernet (PoE)	Yes
AC adapter input voltage	100 - 240 V
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95%
Width	8.9" (226 mm)
Depth	8.9" (226 mm)
Height	7.28" (185 mm)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800