Sound and Hear with Remarkable Clarity

Yealink Optima HD Voice technology combines cutting-edge hardware and software with wideband technology for maximum acoustic performance.

Efficient Deployment and Management

Yealink T4U series supports effortless mass deployment and Zero Touch Provisioning with Yealink's Redirection and Provisioning Service (RPS) and Boot mechanism, making the device management labor-saving and efficient for the administrators.

Dual USB Ports for Flexible Expansion Choices
Bluetooth/Wi-Fi/Wireless Headset Dongles
With the optional USB dongles, the T42U can be enabled of the features including Bluetooth and Wi-Fi or connecting to a compatible wireless headset.

Specification

Product
Product id	812880
Brand	Yealink Network Technology
Partnr	SIP-T42U
EAN/UPC code	SIP-T42U
Display
Display	LCD
Display resolution	192 x 68 Pixels
Display diagonal	2.7 inch
Phone features
Caller ID	Y
Do not disturb function	Y
Redialing	Y
Conference call	Y
Call forwarding	Y
Call hold	Y
Speed dialling	Y
Number of VoIP accounts	12
Distinctive ring	Y
Call waiting	Y
Call transfer	Y
Phonebook capacity	1000 entries
Call history	Y
Call park	Y
Call pick up	Y
Anonymous call	Y
Anonymous call rejection	Y
Direct call	Y
Full duplex	Y
Network
Bluetooth	Y
Ethernet LAN	Y
Ethernet LAN interface type	Gigabit Ethernet
Supported network protocols	IPv4/IPv6, SIP v1 (RFC2543), v2 (RFC3261), UDP/TCP/DNS-SRV (RFC 3263)
Wi-Fi	Y
Quality of Service (QoS) support	Y
Networking standards	IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.1x, IEEE 802.3af
Camera
Rear camera	Y
Security
Security algorithms	256-bit AES, HTTPS, TLS, WPA2, WPA3
Ports & interfaces
Ethernet LAN (RJ-45) ports	2
USB 2.0 ports quantity	2
RJ-9 ports quantity	2
Power
AC adapter input voltage	100 - 240 V
Power consumption (typical)	2.2 W
Input frequency	50/60 Hz
AC adapter output voltage	5 V
AC adapter output current	1.2 A
Design
Product type	IP phone
Handset type	Wireless handset
Device lock	Y
Wall mountable	Y
Mounting	Desk/Wall
Weight & dimensions
Width	212 mm
Depth	189 mm
Package weight	63000 g
Height	175 mm
Package width	627 mm
Package depth	256 mm
Package height	235 mm
Management features
Integrated voicemail	N
Number of programmable keys	6
Number of function keys	5
Colour
Product colour	Grey
Operational conditions
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 procent
Packaging content
Number of handles included	1 stuk(s)