Yealink SIP-T33P Manual

The Yealink SIP-T33P is a mid-range IP phone designed for small to medium businesses, featuring a 3.5-inch color LCD screen, 3 programmable line keys, dual Gigabit Ethernet ports, HD voice with wideband audio, support for up to 3 SIP accounts, built-in PoE, USB port for expansion, and compatibility with 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. Advanced Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 3.5-inch color LCD display, Handset, Base unit, Ethernet cables, Power adapter, Quick start guide.

Feature	Description
Display	3.5-inch color LCD with 320x240 resolution
Line Keys	3 programmable line keys with LED indicators
Network Ports	Dual Gigabit Ethernet (LAN/PoE, PC)
Audio	HD voice with wideband audio, built-in speakerphone
SIP Accounts	Supports up to 3 SIP accounts
Power	Built-in PoE (802.3af) or external power adapter
USB Port	For future expansion modules
Headset Port	3.5mm headset jack for hands-free operation
Codecs	G.722, G.711, G.729, iLBC, Opus
Firmware	Field upgradable via web interface or TFTP

Installation

Unpack and inspect contents. Place on stable surface.

Connect network: Use Ethernet cable to connect LAN/PoE port to switch/router.
Connect PC: Use second Ethernet port to connect to computer if needed.
Power the phone: Use PoE from switch or connect power adapter to DC port.
Connect handset: Plug handset cable into dedicated port.
Connect headset: Optional 3.5mm headset connection.

WARNING! Use only approved power adapter. Ensure proper ventilation around device.

First-Time Setup

Power on phone; follow on-screen prompts.

Network configuration: Phone will attempt DHCP; check IP address on screen.
SIP account setup: Enter SIP server, username, password via web interface or phone menu.
Time/Date: Set automatically via NTP or manually in settings.
Language: Select language preference (default ENGLISH).
Test call: Make test call to verify audio quality and connectivity.

CAUTION! Keep phone away from liquids and extreme temperatures.

Specifications

Display: 3.5-inch color TFT LCD, 320x240 pixels.
Network: Dual 10/100/1000 Mbps Ethernet ports, IEEE 802.3af PoE.
Protocols: SIP RFC3261, TCP/IP, UDP, RTP, RTCP, DHCP, DNS, NTP.
Audio Features: HD voice, full-duplex speakerphone, acoustic echo cancellation.
Programmable Keys: 3 line keys with multi-color LEDs.
Power Supply: 48V DC via PoE or 12V DC power adapter.
Operating Environment: 0°C to 40°C, 10% to 90% humidity.
Dimensions: 200mm x 200mm x 60mm (W x D x H).
Weight: 0.8 kg.

Controls and Settings

Access menu via OK button or web interface (http://phone-ip). Front Panel: LCD display, Navigation keys, OK button, Hold, Mute, Headset, Speakerphone, Volume controls.

Soft Keys: Context-sensitive functions displayed on screen.

Basic Settings: Time/Date, Language, Display contrast, Ring tone selection. Network: DHCP/Static IP, VLAN, QoS. SIP Accounts: Server address, username, password, display name. Audio: Volume levels, ring tone, codec priority. Features: Call forward, DND, call waiting, auto answer.

Connecting Devices

Network: Ethernet to switch/router. PC: Through phone's PC port. Headset: 3.5mm jack.

Turn off phone before connecting additional devices.
Match cables to correct ports (Ethernet to LAN, headset to headset jack).
Verify connections are secure.

Tip: Use quality Ethernet cables for best network performance.

Advanced Features

Supports advanced VoIP features for business use.

Call Management: Hold, transfer, conference, park.
Directory: Local phonebook, LDAP directory support.
Call History: Missed, received, placed calls.
XML Applications: Custom phone services via XML.
BLF: Busy Lamp Field on programmable keys.
Music on Hold: Customizable audio files.
VPN Support: For secure remote connectivity.
Firewall Traversal: STUN, ICE, TURN support.

WARNING! Configure advanced features through web interface with proper credentials.

Accessibility Features

Visual Alerts: LED indicators for line status. Audio Adjustments: Separate volume controls for handset, speaker, ringer. High Contrast: Display contrast adjustment. Large Font: Optional larger text display.

Care & Cleaning

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

CAUTION! Never spray liquids directly on phone. Keep ports free of dust and debris.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. CE marked for European compliance. RoHS compliant. For support, visit www.yealink.com or contact your local distributor. Copyright © Yealink Network Technology Co., Ltd.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power source/connection	Check power adapter/PoE switch; ensure cable is secure.
No network connectivity	Cable/DHCP settings	Check Ethernet cable; verify DHCP is enabled or set static IP.
No dial tone	SIP configuration	Verify SIP account settings; check with service provider.
Poor audio quality	Network/Codec	Check network bandwidth; adjust codec priority; enable QoS.
Display issues	Brightness settings	Adjust display contrast; reboot phone.
Cannot access web interface	IP address/firewall	Verify phone IP address; check firewall settings.

Reset: Press and hold OK for 10 seconds to factory reset (use with caution).

Service: Contact Yealink support or authorized service center.