Yealink SIP T43U Manual

The Yealink SIP T43U is a high-performance IP phone designed for business environments, featuring a 4.3-inch color LCD screen, support for up to 12 SIP accounts, HD voice quality with wideband audio, Gigabit Ethernet ports, integrated PoE, Bluetooth and Wi-Fi compatibility (optional), USB port for expansion, and advanced call handling features. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Advanced Call Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 4.3-inch color LCD, Handset, Base Unit, Ethernet Cable, Power Adapter, Quick Start Guide.

Feature	Description
Display	4.3-inch TFT color LCD with 480 x 272 resolution
Network Ports	Dual Gigabit Ethernet (LAN/PoE and PC)
Audio	HD wideband audio, built-in speakerphone
Wireless	Optional Bluetooth and Wi-Fi modules
Expansion	USB port for connecting wireless headsets or Bluetooth dongle
SIP Accounts	Supports up to 12 SIP accounts
Programmable Keys	Up to 27 programmable keys (line keys, speed dial, BLF)
Codecs	G.722, G.711, G.729, G.726, iLBC, Opus
Power	IEEE 802.3af PoE or external power adapter
Headset Port	Integrated EHS (Electronic Hook Switch) support

Installation

Unpack and inspect contents. Place on stable surface.

Connect to Network: Use Ethernet cable to connect LAN/PoE port to network switch/router.
Connect PC: Use second Ethernet port to connect to computer if needed.
Power the Phone: Use PoE from switch or connect external power adapter to DC port.
Connect Handset: Plug handset cable into dedicated port on base unit.
Optional Headset: Connect wired headset to headset port.

WARNING! Use only approved power adapter. Ensure network cables are securely connected.

First-Time Setup

Power on phone; follow on-screen prompts.

Network Boot: Phone will attempt to obtain IP address via DHCP.
Check Network Status: Press OK, navigate to Status > Network to verify IP.
Provisioning: Enter provisioning URL provided by your VoIP service provider in Menu > Settings > Advanced > Auto Provision.
Account Configuration: Manually enter SIP server, username, and password if not auto-provisioned.
Test Call: Make a test call to verify audio quality and registration.

CAUTION! Ensure firmware is up to date for optimal performance and security.

Specifications

Display: 4.3-inch TFT color LCD, 480 x 272 pixels.
Network: Dual 10/100/1000 Mbps Ethernet, IEEE 802.3af PoE.
Protocols: SIP (RFC3261), TCP/UDP, RTP/RTCP, HTTP/HTTPS, DNS, DHCP.
Audio Features: HD voice, full-duplex speakerphone, acoustic echo cancellation.
Supported Codecs: G.722, G.711 (A/μ-law), G.729AB, G.726, iLBC, Opus.
Programmable Keys: 27 keys (12 line keys, 15 programmable).
Power Supply: 100-240V AC, 50/60Hz; 5V DC, 1.2A.
Operating Environment: 0°C to 40°C, 10% to 90% humidity.

Controls and Settings

Access menu via physical buttons or touch screen. Front Panel: LCD screen, navigation keys, volume keys, mute, headset, speakerphone.

Key Functions: Hold, Transfer, Conference, Redial, Message, Directory, Settings.

Basic Settings: Time & Date, Language, Ringtone selection, Screen Saver. Network: Static/DHCP, VLAN, QoS. Account: SIP server, authentication, display name. Audio: Volume levels for handset, speaker, ringer; codec priority. Advanced: Auto Provision, Firmware Upgrade, Restore Factory Settings.

Connecting Devices

Network: Ethernet to LAN/PoE port. PC: Ethernet to PC port. Headset: Wired to headset port or wireless via Bluetooth/USB.

Turn off phone before connecting additional devices.
For Bluetooth: Enable in Menu > Settings > Bluetooth, then pair device.
For Wi-Fi (optional module): Insert module, configure in Menu > Settings > Wi-Fi.
Select audio path via dedicated headset or speakerphone button.

Tip: Use quality CAT5e or higher Ethernet cables for Gigabit performance.

Advanced Call Features

Supports call hold, transfer, conference, forward, DND, call waiting.

Make Call: Lift handset or press speakerphone, dial number.
Answer Call: Lift handset, press speakerphone, or press Answer soft key.
Hold: Press Hold button during active call.
Transfer: Press Transfer, dial target number, press Transfer again.
Conference: During call, press Conference, dial second party, press Conference again.
Call Forward: Configure in Menu > Features > Call Forward (Always/Busy/No Answer).
Directory: Access local and corporate directory via Directory key.
Call History: Press Redial or navigate to Directory > Call History.

WARNING! Do not disconnect during firmware upgrade. Ensure stable power and network.

Accessibility Features

Visual: Adjustable screen contrast, large font option. Audio: Adjustable ringer volume, distinctive ring patterns, hearing aid compatible (HAC) handset. Physical: Tactile key feedback.

Care & Cleaning

Unplug power before cleaning. Use slightly damp, lint-free cloth for screen and body. Do not use abrasive cleaners or solvents.

CAUTION! Avoid moisture entering ports. Keep away from direct heat sources.

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for residential installation. CE, RCM, UKCA marked. Contains FCC ID: 2AJMTT43U. For support, visit www.yealink.com or contact your authorized Yealink distributor. Copyright © Yealink Inc. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power source/cable	Check power adapter connection; try different outlet; verify PoE switch.
No network	Cable/DHCP	Check Ethernet cable; reboot phone/router; verify DHCP is enabled.
No dial tone	Account registration	Check SIP account credentials; verify network connectivity to SIP server.
Poor audio quality	Network/codec	Check for network congestion; adjust QoS settings; try different codec.
Screen blank	Power/settings	Check power; adjust screen saver timeout in settings.

Reset: Press and hold OK key during boot for factory reset (use with caution).

Service: Contact Yealink support or your service provider. Firmware downloads: support.yealink.com.