Yealink SIP T43U User Manual

The Yealink SIP T43U is a high-performance, full-featured SIP desk phone designed for business environments. It features a 4.3-inch color LCD screen, support for up to 16 SIP accounts, HD voice quality with wideband audio, Gigabit Ethernet ports, dual-band Wi-Fi (optional), Bluetooth, USB ports for expansion, and compatibility with leading IP-PBX and hosted VoIP services. 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, 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)
Wireless	Dual-band Wi-Fi 802.11a/b/g/n/ac (optional module)
Bluetooth	Bluetooth 4.2 for headset pairing
Audio	HD voice, Opus codec, built-in speakerphone
SIP Accounts	Up to 16 lines/accounts
Expansion	USB 2.0 port for Wi-Fi module or USB headset
Programmable Keys	Up to 27 (including 5 physical line keys)
Headset Port	3.5mm headset jack (EHS supported with adapter)
Power	IEEE 802.3af PoE or external power adapter

Installation

Unpack and inspect contents. Place on stable, flat surface.

Connect to Network: Use included Ethernet cable to connect LAN/PoE port to your network switch or router.
Connect PC (Optional): Use second Ethernet cable from PC port to your computer.
Power the Phone: Use PoE from switch or connect the included power adapter to the DC 5V port.
Connect Handset: Plug handset cord into the dedicated jack on the base.
Connect Headset (Optional): Plug into 3.5mm headset jack.

WARNING! Use only the provided or Yealink-approved power adapter. Ensure cables are securely connected.

First-Time Setup

Power on the phone; it will boot and attempt to auto-provision from the network.

Network Configuration: If using DHCP (default), the phone will obtain an IP address automatically. Check IP via Menu > Status > Network.
Account Registration: Enter SIP server details provided by your service provider via Menu > Account > Account X.
Set Language: Press Menu > Settings > Basic > Preferences > Language.
Set Time and Date: Configure via Menu > Settings > Basic > Time & Date.
Test Call: Lift handset and dial an extension or external number to verify audio.

CAUTION! Do not place the phone near heat sources or in direct sunlight.

Specifications

Display: 4.3-inch TFT color 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 SRV.
Audio Codecs: G.711, G.722, G.729, G.726, Opus, iLBC, etc.
Programmable Keys: 27 (5 physical line keys, 22 via screen).
Power Supply: IEEE 802.3af PoE or 5V DC, 1.2A external adapter.
Operating Environment: 0°C to 40°C, 10% to 90% humidity.
Supported Services: Call forward, call waiting, hold, transfer, conference, auto answer, etc.

Controls and Settings

Access settings via the Menu button or touch screen.

Front Panel: LCD touch screen, 5 physical line keys, Navigation pad, Hold, Mute, Headset, Speakerphone, Volume keys, Menu, Message, Transfer, Conference, Redial.

Menu Structure: Status (Network, Account, System), Settings (Account, Audio, Time, Network, Security), Features (Call Forward, DND, Call Waiting), Directory (Local, Corporate), Call History (Missed, Received, Placed).

Audio Settings: Adjust handset, headset, and speakerphone volume and tone via Menu > Settings > Audio.

Connecting Devices

Network: Use Ethernet cable to LAN/PoE port. PC: Connect to PC port for pass-through. Headset: Plug into 3.5mm jack. Wi-Fi: Insert optional USB Wi-Fi module.

Ensure phone is powered off before connecting new devices.
For Wi-Fi, insert module, then configure via Menu > Settings > Network > Wi-Fi.
For Bluetooth headset, enable via Menu > Settings > Bluetooth, then pair.

Tip: Use certified peripherals for optimal compatibility and performance.

Advanced Features

Supports advanced business telephony features.

Call Transfer: During a call, press Transfer, dial target number, press Transfer again or hang up for blind transfer.
Three-Way Conference: During a call, press Conference, dial third party, press Conference again to merge.
Call Forward: Set via Menu > Features > Call Forward (Always, Busy, No Answer).
Do Not Disturb (DND): Press DND key or enable via Menu > Features > DND.
Programmable Keys: Configure via Menu > Settings > Features > Programmable Keys for speed dial, BLF, etc.
Phone Lock: Set a PIN via Menu > Settings > Security > Phone Lock to prevent unauthorized use.
XML Directory & Services: Configure for corporate directory or custom services via web interface.

WARNING! Do not use liquid or abrasive cleaners on the touch screen.

Accessibility Features

High-Contrast Display: Adjustable in Settings > Basic > Display. Audio: Adjustable tone and volume for handset, headset, and ringer. Visual Alert: LED indicator for missed calls/messages.

Care & Cleaning

Unplug power before cleaning. Use a soft, dry cloth to wipe the phone. For stubborn marks, lightly dampen cloth with water. Do not use chemicals or aerosols.

CAUTION! Never spray liquid directly on the phone. Keep liquids away from the device.

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for residential use. CE, RCM, UKCA marked. This device complies with Part 68 of FCC rules. Hearing Aid Compatibility (HAC): Rated M3/T3. For full compliance statements, visit the Yealink website. Copyright © Yealink Network Technology. For support, visit www.yealink.com or contact your service provider.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power/no display	Power source	Check PoE switch or power adapter connection; try another outlet.
No network connectivity	Cable/DHCP	Check Ethernet cable; verify DHCP is enabled or set static IP.
Cannot register to server	Account settings	Verify SIP server address, username, password, and network firewall.
No audio on calls	Volume/codec	Check volume settings; ensure compatible codec with server.
Touch screen unresponsive	Screen lock/calibration	Unlock screen; recalibrate via Menu > Settings > Basic > Screen.
Cannot hear ringtone	Ringtone volume/DND	Adjust ring volume via Volume key during idle; disable DND.

Reset: Press and hold the OK key on boot to factory reset (erases all settings).

Web Interface: Access via http://[phone-IP] for advanced configuration (default admin password: admin).

Service: Contact your VoIP service provider or visit www.yealink.com/support.