Yealink T43U Phone Manual

The Yealink T43U is a feature-rich, high-performance IP phone designed for modern business communication. It features a 4.3-inch color LCD screen, support for up to 16 SIP accounts, HD voice, dual Gigabit Ethernet ports, integrated Bluetooth, Wi-Fi capability (with optional adapter), USB port, and advanced telephony 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 Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 4.3-inch color LCD screen, handset, base unit, Ethernet cables, power adapter, and optional accessories.

Feature	Description
Display	4.3-inch color LCD with 480 x 272 resolution
Network Ports	Dual Gigabit Ethernet (LAN and PC)
Audio	HD handset and speakerphone with Opus codec support
Wireless	Integrated Bluetooth, optional Wi-Fi via USB adapter
USB Port	For Wi-Fi adapter, Bluetooth headset, or USB expansion
Expansion Module	Support for up to 2 Yealink expansion modules (optional)
Programmable Keys	Up to 27 programmable keys (including line keys)
Headset Port	3.5mm headset jack for wired headset connection
Power	IEEE 802.3af PoE or external power adapter
Firmware	Upgradable via web interface or TFTP

Installation

Unpack and inspect contents. Place on stable surface.

Connect to Network: Use Ethernet cable to connect LAN port to your network switch/router. For PoE, ensure switch supports 802.3af.
Connect PC: Use second Ethernet cable from PC port to your computer (optional).
Power the Phone: Use PoE or connect the included power adapter to the DC port and wall outlet.
Connect Handset: Plug handset cord into the dedicated jack on the phone base.
Connect Headset: Plug wired headset into 3.5mm headset jack (optional).

WARNING! Use only the provided or Yealink-approved power adapter. Ensure proper ventilation around the device.

First-Time Setup

Power on the phone; follow on-screen prompts and configure via web interface.

Obtain IP Address: Phone will obtain an IP via DHCP. Check IP on screen (Press Menu -> Status -> Network).
Access Web Interface: Enter the phone's IP address in a computer web browser.
Configure SIP Accounts: Go to Account tab and enter SIP server, username, password provided by your service provider.
Set Language and Time: In Settings -> Basic -> Preferences, set language, time zone, and NTP server.
Test Call: Make a test call to verify audio quality and registration.

CAUTION! Keep firmware updated for security and performance. Back up configuration before major changes.

Specifications

Display: 4.3-inch color TFT LCD, 480 x 272 pixels.
Network: Dual 10/100/1000 Mbps Ethernet ports, IEEE 802.3af PoE.
Protocols: SIP RFC3261, TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, DNS, DHCP, LLDP-MED.
Audio Codecs: Opus, G.722, G.711 (A/μ-law), G.729, G.726, iLBC, BroadVoice.
Wireless: Bluetooth 4.2 (BR/EDR + BLE), Wi-Fi 802.11a/b/g/n/ac (with optional adapter).
Programmable Keys: 6 line keys + 5 programmable soft keys + 16 virtual keys via expansion modules.
Power Supply: IEEE 802.3af PoE or 12V DC, 1.5A power adapter.
Operating Environment: 0°C to 40°C, 10% to 90% humidity (non-condensing).
Supported Languages: English, French, Spanish, German, Italian, Russian, and more.

Controls and Settings

Access settings via phone menu or web interface. Front Panel: LCD screen, navigation pad, soft keys, line keys, speakerphone, mute, headset.

Key Functions: Hold, Transfer, Conference, Redial, Message, Directory, Volume up/down.

Phone Menu: Contacts, Call History, Settings (Audio, Display, Network, Features). Web Interface: Advanced configuration for Accounts, Features (Call Forward, DND, Call Waiting), Security, Firmware Upgrade.

Connecting Devices

Network: LAN port to switch. PC: PC port to computer. Headset: 3.5mm jack or Bluetooth. Expansion: USB port for Wi-Fi adapter or Bluetooth dongle.

Turn off phone before connecting wired accessories.
For Bluetooth, enable in Menu -> Settings -> Bluetooth -> Discoverable.
For Wi-Fi, insert USB adapter, configure via Menu -> Settings -> Network -> Wi-Fi.

Tip: Use quality Ethernet cables (Cat5e or higher) for Gigabit performance.

Advanced Features

Supports advanced business telephony features.

Call Handling: Hold, Transfer (Blind/Attended), Conference (3-party).
Call Forward: Configure unconditional, busy, no answer via web or phone menu.
Do Not Disturb (DND): Enable/disable with timer.
Busy Lamp Field (BLF): Monitor extension status on programmable keys.
Music on Hold: Upload custom audio files via web interface.
XML Browser: For custom directories and services.
LDAP Directory: Integrate with corporate LDAP for contact search.
VPN Support: For secure remote connectivity.

WARNING! Configure advanced features per your PBX/service provider requirements.

Accessibility Features

High-Contrast Display: Adjust in Settings -> Display. Audio Adjustments: Independent volume for handset, speaker, headset. TTY Support: Configurable for hearing-impaired users. Large Font: Option for easier reading.

Care & Cleaning

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

CAUTION! Avoid liquid contact with ports and openings. 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: 2ADUI-T43U. For EU, complies with RED 2014/53/EU. This device meets ENERGY STAR® requirements. For support, visit www.yealink.com or contact your authorized reseller.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	PoE/Power adapter	Check PoE switch; ensure power adapter is securely connected; try different outlet.
No network connection	Cable/DHCP	Check Ethernet cable; verify DHCP server is active; restart phone.
No audio on calls	Volume/Codec	Adjust volume; check audio codec compatibility with SIP server.
Cannot register to server	Account settings	Verify SIP server address, username, password; check network firewall.
Bluetooth not connecting	Pairing mode/distance	Ensure headset is in pairing mode; keep within 10 meters; remove obstacles.
Display issues	Brightness/settings	Adjust display brightness; reboot phone; check for firmware updates.

Factory Reset: Press and hold OK key during boot until "Restoring" appears (Note: Erases all settings).

Service: Contact your service provider or visit www.yealink.com for firmware and documentation.