Yealink T33G IP Phone Manual

The Yealink T33G is a feature-rich, entry-level Gigabit IP phone designed for small to medium businesses. It features a 132 x 48 pixel graphical LCD with backlight, 2 programmable line keys, dual Gigabit Ethernet ports, PoE support, HD voice, wideband audio, and support for major SIP 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. Basic Call Operations 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Graphical LCD display, Handset, Keypad, 2 programmable line keys, Speaker, Ethernet ports, Power adapter port.

Feature	Description
Display	132 x 48 pixel graphical LCD with backlight
Line Keys	2 programmable line/speed-dial keys
Network	Dual Gigabit Ethernet ports (LAN & PC)
Power	IEEE 802.3af PoE or external power adapter
Audio	HD voice, wideband audio, built-in speaker and microphone
Handset	RJ9 handset connector with hearing aid compatible (HAC) support
Headset	RJ9 headset port (optional)
Firmware	Field upgradable via web interface or TFTP
Protocols	SIP (Session Initiation Protocol)
Mounting	Desk mount and wall mount capable

Installation

Unpack and inspect contents. Place on stable surface or mount on wall.

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: Use PoE from switch or connect the included power adapter to the DC 5V port.
Connect Handset: Plug the handset cord into the RJ9 handset port.
Connect Headset (Optional): Plug headset into the RJ9 headset port.

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

First-Time Setup

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

Check Network: Ensure the phone obtains an IP address (check display or web interface).
Configure Account: Via web interface (enter phone's IP in browser) or directly on phone menu: Press Menu key > Settings > Account > configure SIP server, username, password.
Set Date & Time: Menu > Settings > Time & Date > configure NTP server or manual settings.
Test Call: Lift handset and dial a number to verify registration and audio.

CAUTION! Handle the handset cord with care to avoid damage to the connector.

Specifications

Display: 132 x 48 pixel graphical LCD, backlight.
Network Interfaces: Dual 10/100/1000 Mbps Ethernet ports.
Protocols: SIP RFC3261, TCP/IP, UDP, RTP, RTCP, DHCP, DNS, NTP.
Audio Codecs: G.711A/u, G.722, G.726, G.729AB, iLBC, Opus.
QoS: Layer 2 QoS (802.1Q, 802.1p) and Layer 3 (ToS, DiffServ).
Power Supply: IEEE 802.3af PoE or DC 5V, 0.5A external adapter.
Physical: Desk/wall mountable; Handset: HAC compatible.
Operating Environment: 0°C to 40°C, 10% to 90% humidity (non-condensing).
Supported Platforms: BroadSoft, Asterisk, 3CX, Metaswitch, and other standard SIP platforms.

Controls and Settings

Access menu via dedicated Menu key. Navigation: 4-way navigation key with OK in center.

Keypad: 0-9, *, #, Mute, Headset, Speakerphone, Redial, Transfer, Conference, Hold, Volume keys.

Basic Settings via Phone UI: Menu > Settings > Account, Time & Date, Audio (ringer, handset, speaker volume), Network. Advanced Settings via Web Interface: Access phone IP in browser (default user/password: admin/admin). Configure SIP parameters, call features, firmware upgrade, VLAN.

Connecting Devices

Network: LAN port to switch. PC: PC port to computer. Power: PoE or DC adapter.

Turn off devices before connecting if not using hot-pluggable PoE.
Match cables to ports (RJ45 to LAN/PC, RJ9 to handset/headset).
For wall mounting, attach the wall mount bracket to the phone first.

Tip: Use Cat5e or better Ethernet cables for Gigabit performance.

Basic Call Operations

Make, answer, and manage calls.

Make a Call: Lift handset or press Speakerphone, dial number, press Dial softkey or wait.
Answer a Call: Lift handset, press Speakerphone, or press Answer softkey.
End a Call: Hang up handset or press EndCall softkey.
Hold/Resume: Press Hold key during a call; press Resume softkey.
Mute: Press Mute key during a call to mute microphone.
Transfer: During a call, press Transfer, dial target number, press Transfer again.
Conference: During first call, press Conference, dial second party, press Conference again to merge.
Redial: Press Redial key or check Call History list.
Adjust Volume: Use Volume keys during a call (handset/speaker) or idle (ringer).

WARNING! Do not disassemble the phone. No user-serviceable parts inside.

Accessibility Features

Hearing Aid Compatible (HAC) Handset: Meets FCC requirements. Visual Alerts: Flashing LED for incoming calls (configurable). Ringer Volume: Adjustable up to 90dB. High-Contrast Display: Backlit for better visibility.

Care & Cleaning

Unplug power before cleaning. Use a soft, dry cloth. For stubborn dirt, dampen cloth slightly with water. Do not use abrasive cleaners or solvents.

CAUTION! Do not allow moisture to enter openings. Keep away from direct heat sources.

Regulatory Information

FCC Part 15 & 68: Complies with rules for digital devices and telephone equipment. CE Marked: Complies with European directives. RCM Mark: Complies with Australian communications standards. This Class B digital apparatus complies with Canadian ICES-003. For full compliance statements, visit the Yealink website. Copyright © Yealink Network Technology Co., Ltd. For support, visit www.yealink.com or contact your authorized reseller.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power/no display	Power source/cable	Check PoE switch or power adapter connection; try another cable.
No dial tone	Network/account config	Check Ethernet link light; verify SIP account is registered.
One-way/no audio	Network QoS/firewall	Check QoS settings on network; verify firewall allows RTP ports.
Cannot access web interface	IP address/credentials	Find phone IP on display (Menu > Status); use correct login (admin/admin).
Call drops intermittently	Network instability	Check cable quality; test with different switch port; update firmware.
Poor audio quality	Codec/network jitter	Try different audio codec (e.g., G.711); enable jitter buffer in web settings.

Reset: Press and hold OK key for 10 seconds during boot to factory reset (or via web interface).

Service: Contact your system administrator or visit www.yealink.com for firmware and documentation.