Yealink Phones Manual SIP-T33G

The Yealink SIP-T33G is a feature-rich IP phone designed for small to medium-sized businesses, offering HD voice quality, dual Gigabit Ethernet ports, support for up to 12 SIP accounts, a 2.4-inch color LCD screen, PoE support, and integration 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 Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Color LCD screen, Handset, Ethernet ports, Power adapter port, Headset jack, Programmable keys.

Feature	Description
HD Voice	Wideband audio for crystal-clear calls
Dual Gigabit Ethernet	LAN and PC ports for network connectivity
PoE Support	Power over Ethernet (IEEE 802.3af)
12 SIP Accounts	Support for multiple VoIP service lines
2.4-inch Color LCD	Backlit display with adjustable contrast
Headset Port	3.5mm jack for hands-free operation
Programmable Keys	4 line keys with LED indicators
HANDSFREE	Speakerphone for hands-free calling
MUTE	Mutes microphone during calls
POWER	Turns phone on/off (when using adapter)

Installation

Unpack and inspect contents. Place on stable surface.

Connect to network: Use Ethernet cable to connect LAN port to router/switch.
Connect PC (optional): Use second Ethernet cable from PC port to computer.
Power the phone: Use PoE from switch or connect power adapter to DC port.
Connect handset: Plug handset cord into dedicated port.
Connect headset (optional): Plug into 3.5mm headset jack.

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

First-Time Setup

Power on phone; follow on-screen prompts.

Network configuration: Phone will attempt DHCP; check IP address on screen.
Provisioning: Enter URL for auto-provisioning server if provided by IT admin.
Account registration: Enter SIP server, username, password for VoIP service.
Set language: In Settings menu, select preferred language (default ENGLISH).
Adjust settings: Configure time/date, ringtones, display contrast.

CAUTION! Keep phone away from direct heat sources and liquids.

Specifications

Display: 2.4-inch TFT color LCD (320 x 240 pixels).
Network: Dual 10/100/1000 Mbps Ethernet, IEEE 802.3af PoE.
Protocols: SIP (RFC3261), TCP/IP, UDP, RTP, RTCP, DHCP, DNS.
Audio Codecs: G.711, G.722, G.729, Opus.
Power Supply: Input 100-240V AC, 50/60Hz; Output 12V DC.
Supported Features: Call hold/transfer, conferencing, call waiting, DND, speed dial.
Operating Temp: 0°C to 40°C (32°F to 104°F).
Certifications: FCC, CE, RCM, RoHS.

Controls and Settings

Access menu via MENU button. Front Panel: LCD, Navigation keys, HANDSFREE, MUTE, HEADSET, PROGRAMMABLE KEYS.

Buttons: HOLD, TRANSFER, CONFERENCE, REDIAL, MESSAGE, VOLUME UP/DOWN, MUTE.

Settings Menu: Network (IP, DHCP, VLAN), Account (SIP registration), Audio (ringer volume, tone), Display (contrast, backlight time), Time (time zone, NTP). Advanced: Firmware upgrade, Restore factory defaults.

Connecting Devices

Network: LAN port to router. PC: PC port to computer. Headset: 3.5mm jack.

Turn off phone before connecting cables if using power adapter.
Match Ethernet cables to correct ports (LAN vs PC).
For PoE, ensure switch provides adequate power (IEEE 802.3af).

Tip: Use shielded Ethernet cables in environments with potential interference.

Advanced Features

Supports advanced VoIP features for business use.

Call Hold/Transfer: Press HOLD during call; use TRANSFER to redirect.
Conference Calls: Press CONFERENCE, dial second party, press CONFERENCE again.
Speed Dial: Assign numbers to programmable keys via web interface.
DND (Do Not Disturb): Enable via DND key or menu to silence calls.
Call Forwarding: Configure via phone menu or web portal.
BLF (Busy Lamp Field): Monitor status of other extensions (if supported by PBX).
Firmware Upgrade: Upload via web interface or auto-provisioning.

WARNING! Do not interrupt firmware upgrade process; may cause phone malfunction.

Accessibility Features

High-Contrast Display: Adjust in Display settings. Ringer Volume: Adjustable up to 90dB. Headset Mode: For hands-free operation. Visual Alerts: LED indicators for missed calls/messages.

Care & Cleaning

Unplug power before cleaning. Use slightly damp cloth for exterior; dry immediately. Do not use abrasive cleaners.

CAUTION! Avoid liquids entering vents or ports. Do not disassemble phone.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Yealink Inc. All rights reserved. For support, visit www.yealink.com or contact your local distributor. This product contains software subject to license agreements.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power adapter/PoE	Check adapter connection; ensure PoE switch is powered; try different cable.
No network	Cable/DHCP	Check Ethernet cable; verify DHCP server; restart phone.
No registration	SIP credentials	Verify username/password; check SIP server address; contact IT admin.
No audio	Handset/network	Check handset cord; adjust volume; verify codec compatibility.
Display blank	Power/backlight	Check power; adjust display contrast in settings.

Reset: Press and hold OK key during boot for factory reset (erases all settings).

Service: www.yealink.com/support; contact authorized service center.