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Yealink SIP-T43U VoIP phone, classic grey, 3.7-inch screen, corded handset, desktop stand

Yealink Network Technology Co., Ltd

Yealink Network Technology Co., Ltd SIP-T43U VoIP 3.7-inch screen 12 lines

SKU CH-18DA-58QR2 MPN SIP-T43U

A 12-line wired VoIP phone with a 3.7-inch screen, dual Gigabit Ethernet ports and two USB 2.0 ports for headset or recording accessories

  • TypeWired VoIP
  • SecurityNETWORK AND SECURITY SIP v1 (RFC2543), v2 (RFC3261) Call ser
  • PortsDual-port Gigabit Ethernet Power over Ethernet (IEEE 802.3af
  • PowerExternal Yealink AC adapter (optional): AC 100-240 V input a
  • DimensionsDimension (WxDxHxT): 224.9 x 206.2 x 174.9 x 52 mm
  • FeaturesPHONE 12 VoIP accounts One-touch speed dial, redial Call for

Model SIP-T43U

Struck-through versions exist but are not stocked here.

  • 12 VoIP accounts for multi-line management
  • 7-inch screen for clear call information
  • Dual Gigabit Ethernet ports with PoE support
  • Two USB 2.0 ports for headset and accessories
  • HD Voice with Opus codec for crystal-clear audio

12-line VoIP phone for office desks

The Yealink SIP-T43U is a wired IP phone with a 3.7-inch display and support for 12 SIP accounts. It connects via dual Gigabit Ethernet ports and can be powered by PoE or an optional AC adapter. The handset includes two USB 2.0 ports for accessories such as a headset or Bluetooth dongle.

Power draw and thermal profile

Power consumption ranges from 0.9 to 2.2 W with the external supply and 1.5 to 3.2 W over PoE Class 2. The unit has no internal fan, so it runs silently on a desk or wall mount. Heat output stays low during normal call handling and conference use.

12 simultaneous SIP accounts

This model supports exactly 12 VoIP lines, making it suited for staff who manage multiple extensions or shared appearances. Buyers who need more concurrent registrations should choose a handset with a higher account limit. The 3.7-inch screen shows caller data for each active line.

Highlights

  • 12 VoIP accounts for multi-line management
  • 7-inch screen for clear call information
  • Dual Gigabit Ethernet ports with PoE support
  • Two USB 2.0 ports for headset and accessories
  • HD Voice with Opus codec for crystal-clear audio

Specifications

BrandYealink
ModelSIP-T43U
Part NumberSIP-T43U
TypeWired VoIP
SecurityNETWORK AND SECURITY
SIP v1 (RFC2543), v2 (RFC3261)
Call server redundancy supported
NAT traversal: STUN mode
Proxy mode and peer-to-peer SIP link mode
IP assignment: static/DHCP
HTTP/HTTPS web server
Time and date synchronization using SNTP
UDP/TCP/DNS-SRV(RFC 3263)
QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSCP
SRTP for voice
Transport Layer Security (TLS 1.3)
HTTPS certificate manager
AES encryption for configuration file (AES256)
Digest authentication: MD5/SHA1/SHA224/-SHA256/SHA384/SHA512
OpenVPN, IEEE802.1X, L2TP VPN
IPv6
LLDP/CDP/DHCP VLAN
ICE
> WPA2/WPA3
> Secure boot
> GARP
PortsDual-port Gigabit Ethernet
Power over Ethernet (IEEE 802.3af), Class 2
2 x USB port (2.0 compliant)
1 x RJ9 (4P4C) handset port
1 x RJ9 (4P4C) headset port
PowerExternal Yealink AC adapter (optional): AC 100-240 V input and DC 5 V/1.2 A output
USB output currency: 5 V 500 mA
Power consumption (PSU): 0.9-2.2 W
Power consumption (PoE): 1.5-3.2 W
DimensionsDimension (WxDxHxT): 224.9 x 206.2 x 174.9 x 52 mm
FeaturesPHONE
12 VoIP accounts
One-touch speed dial, redial
Call forward, call waiting, call transfer, call hold
Call return, group listening
Emergency call
Mute, DND
Auto answer
Hoteline
5-way conference call
Direct IP call without SIP proxy
Ring tone selection/import/delete
Set date time manually or automatically
Dial Plan, XML Browser, Action URL/URI
RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)
Dual USB ports (2.0 compliant)
USB/Bluetooth connectivity to Yealink CP900/CP700speakerphone/wireless headset UH38, USB connectivity to Yealink wired headset UH34/UH36/UH37
Enhanced DSS key
AUDIO
HD voic
Package ContentsSIP-T43U IP Phone
Handset with Handset Cord
Ethernet Cable (2m CAT5E UTP Cable)
Stand
Quick Start Guide
Shipping weight1.36 kg
Package size254 × 254 × 127 mm

Other versions of this model

3 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How do I wall-mount the SIP-T43U without blocking the 2 x USB 2.0 ports?

Remove the desktop stand, attach the wall bracket using the recessed slots on the back, then route the Ethernet and handset cables through the lower channel so the USB ports stay accessible for a headset or recording stick.

Which parts of the SIP-T43U will need replacement after heavy daily use?

The handset cord and the RJ9 headset jack see the most mechanical stress; the USB ports are rated for 5 V 500 mA each and can wear if devices are swapped constantly, so keep a spare handset cord handy.

What power limit appears first when the SIP-T43U runs 12 lines on PoE Class 2?

PoE Class 2 caps the phone at 3.2 W, so with all 12 accounts active, a full 5-way conference and both USB ports drawing 500 mA, you hit the 3.2 W ceiling before the dual Gigabit ports saturate.

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