Yealink T33G Phone Manual

The Yealink T33G is a feature-rich VoIP desk phone designed for business environments, supporting 3 SIP lines, HD voice, a 132x48 pixel graphical LCD with backlight, PoE (802.3af), dual Gigabit Ethernet ports, EHS support for wireless headsets, and compatibility with major IP PBX platforms. 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: Graphical LCD display, Handset, Keypad, Function keys, Ethernet ports, Power adapter port.

Feature	Description
LCD Display	132x48 pixel graphical LCD with backlight for call information and menus
HD Voice	Wideband audio support for superior call quality
Dual Ethernet Ports	10/100/1000 Mbps LAN and PC ports for pass-through connectivity
PoE Support	IEEE 802.3af compliant for power over Ethernet
EHS Support	Electronic Hook Switch for wireless headset compatibility
SIP Lines	Supports up to 3 SIP accounts
Function Keys	Programmable keys for line, speed dial, BLF, and features
Headset Port	3.5mm jack for wired headset connection
Handset	Traditional handset with HD voice receiver
Power Adapter	Input: 100-240V AC; Output: 5V DC

Installation

Unpack and inspect contents. Place on stable desk surface.

Connect Network: Use Ethernet cable to connect LAN port to your network switch/router.
Connect PC (Optional): Use second Ethernet cable from PC port to your computer.
Power the Phone: Connect the power adapter to the DC 5V port and wall outlet, OR use PoE from switch.
Connect Handset/Headset: Plug handset cord into dedicated port; connect headset to 3.5mm jack if needed.

WARNING! Use only the provided or approved power adapter. Ensure cables are not pinched or damaged.

First-Time Setup

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

Obtain IP Address: Check LCD screen for assigned IP or press "OK" > Status > Network.
Access Web Interface: Enter phone's IP address in a computer browser.
Configure SIP Accounts: Navigate to Account tab, enter SIP server, username, password provided by your service provider.
Set Language/Time: In Settings menu, select preferred language and configure NTP server for time.

CAUTION! Ensure proper ventilation; do not block vents on phone housing.

Specifications

Display: 132x48 pixel graphical LCD with backlight.
Network Interfaces: Dual 10/100/1000 Mbps Ethernet (LAN & PC).
Protocols: SIP (RFC3261), TCP/IP, UDP, RTP, RTCP, DHCP, DNS, NTP.
Audio Codecs: G.711 (A/μ), G.722 (HD), G.726, G.729AB, Opus.
Power Supply: External 5V DC adapter or IEEE 802.3af PoE.
Physical: Desk mountable; standard handset.
Operating Environment: Temperature: 0°C to 40°C; Humidity: 10% to 90% non-condensing.
Compliance: FCC Part 15, CE, RCM.

Controls and Settings

Access menus via "OK" button or web interface. Keypad: 0-9, *, #, Navigation arrows, OK, Cancel, Speaker, Mute, Headset, Volume keys.

Function Keys: Can be programmed as line keys, speed dial, BLF (Busy Lamp Field), or feature keys (e.g., DND, Call Forward).

Settings via LCD: Press "OK" for menu > Settings for Time, Language, Ring Tones, Screen Saver. Web Interface: Advanced configuration for Network, Account, Features (Call Forward, DND, Call Waiting), Security.

Connecting Devices

Network: LAN port to switch. PC: PC port to computer. Headset: 3.5mm jack. EHS: Dedicated port for wireless headset adapter.

Ensure phone is powered off before connecting cables.
Match Ethernet cables to correct ports (LAN vs PC).
For PoE, ensure switch provides 802.3af power; else use adapter.

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

Advanced Call Features

Supports standard and advanced VoIP features.

Make Call: Lift handset or press Speaker, dial number.
Answer Call: Lift handset, press Speaker, or press corresponding line key.
Hold: Press Hold key during call.
Transfer: Press Transfer, dial target number, press Transfer again.
Conference: During a call, press Conference, dial second party, press Conference again to merge.
Call Forward: Configure via web interface or phone menu (Always, Busy, No Answer).
DND (Do Not Disturb): Press DND key or enable via menu.
BLF Monitoring: Program key to monitor extension status.

WARNING! Do not use liquid or abrasive cleaners on keys or display.

Accessibility Features

Adjustable Ring Volume: Via volume keys or settings menu. Screen Contrast: Adjust in Display settings. Headset Mode: Toggle between handset and headset. Hearing Aid Compatible (HAC) handset available in some regions.

Care & Cleaning

Unplug power before cleaning. Use soft, dry cloth; for stubborn marks, dampen cloth slightly with water. Do not use solvents.

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

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for residential installation. CE: Conforms to European EMC and safety standards. This device may not cause harmful interference and must accept any interference received. Copyright © Yealink Inc. For support, visit www.yealink.com or contact your authorized reseller.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power/PoE not working	Power source/cable	Check power adapter connection; try different Ethernet cable; verify PoE switch is enabled.
No network registration	Network/SIP settings	Verify IP address via LCD; check SIP server address, username, password; confirm firewall allows SIP/RTP.
One-way/no audio	Network/Codec	Check router/firewall for symmetric NAT; ensure compatible codec negotiated (e.g., G.711).
Cannot hear ringtone	Volume settings	Press volume up key during idle; check Ring Tone setting in menu.
Keys not responding	Software lock	Check if key lock is enabled (press and hold Cancel); reboot phone.

Reset: Press and hold "OK" key while powering on for factory reset (use with caution).

Service: www.yealink.com/support; contact your service provider or reseller.