Yealink Phone Manual T28P

The Yealink T28P is a professional IP phone designed for business environments, featuring a high-resolution graphical LCD display, support for up to 4 SIP accounts, HD voice quality, PoE support, dual Gigabit Ethernet ports, integrated headset jack, and advanced telephony features. 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: Graphical LCD display, Handset, Keypad, Ethernet ports, Headset jack, Power adapter port.

Feature	Description
Graphical LCD display	High-resolution screen for call information and menus
Handset	HD voice quality handset with noise cancellation
Keypad	Backlit dial pad and function keys
Dual Ethernet ports	Gigabit ports for network and PC connection
Headset jack	3.5mm jack for headset connection
Power adapter port	For external power when PoE is not available
Navigation keys	For menu navigation and call control
Speakerphone	Full-duplex hands-free speaker
MUTE	Mutes microphone during calls
HOLD	Places active calls on hold

Installation

Unpack and inspect contents. Place on stable surface.

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

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

First-Time Setup

Power on phone; follow on-screen prompts.

Network configuration: Phone will obtain IP via DHCP automatically.
SIP account setup: Enter SIP server, username, password via web interface or phone menu.
Date and time: Set time zone and NTP server for automatic time sync.
Audio settings: Adjust handset, speakerphone, and ringer volume.

CAUTION! Keep phone away from liquids and extreme temperatures.

Specifications

Display: 132 x 64 pixel graphical LCD.
Network: Dual 10/100/1000 Mbps Ethernet ports, PoE (802.3af).
Voice Codecs: G.711, G.722, G.726, G.729.
Telephony Features: Call hold, transfer, forward, conference, call waiting.
SIP Accounts: Up to 4 SIP accounts.
Power Source: PoE (802.3af) or 5V DC power adapter.
Operating Temp: 0°C to 40°C (32°F to 104°F).
Supported Protocols: SIP, TCP/IP, UDP, RTP, RTCP, DHCP, NTP.

Controls and Settings

Access menu via navigation keys. Front Panel: LCD display, navigation keys, soft keys, dial pad, MUTE, HOLD, SPEAKERPHONE.

Soft Keys: Context-sensitive keys for call functions (Answer, Transfer, Conference, etc.).

Phone Settings: Network configuration, SIP account setup, audio settings, display settings, time settings. Web Interface: Access via phone IP address for advanced configuration (admin/admin default).

Connecting Devices

Network: Ethernet cable to LAN port. PC: Second Ethernet port to computer. Headset: 3.5mm jack.

Turn off devices before connecting cables.
Use Cat5e or better Ethernet cables.
Connect headset to headset jack for hands-free operation.

Tip: Use PoE switch to reduce cable clutter.

Advanced Features

Supports advanced business telephony features.

Call Transfer: Press Transfer during call, dial number, press Transfer again.
Conference Call: During call, press Conference, dial second party, press Conference again.
Call Forward: Configure via phone menu or web interface.
Speed Dial: Assign numbers to speed dial keys.
Call History: Access missed, received, and dialed calls via navigation keys.
Phone Lock: Set PIN to lock phone when not in use.
BLF (Busy Lamp Field): Monitor extension status (if supported by PBX).

WARNING! Do not disassemble phone; no user-serviceable parts inside.

Accessibility Features

Visual Alerts: Flashing LED for incoming calls. Audio Adjustments: Independent volume controls for handset, speaker, ringer. Large Font: Option for larger display text in menu settings.

Care & Cleaning

Unplug before cleaning. Use slightly damp cloth; do not use abrasive cleaners.

CAUTION! Avoid getting moisture into openings; never spray liquids directly on phone.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. CE marked. For support, visit www.yealink.com or contact your authorized Yealink distributor.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power source	Check PoE switch or power adapter connection; ensure cable is secure.
No network connection	Cable/DHCP	Check Ethernet cable; verify DHCP server is available; restart phone.
No dial tone	SIP registration	Verify SIP account settings; check network connectivity to SIP server.
Poor audio quality	Network/configuration	Check network for packet loss; adjust audio codec settings.
Display issues	Power/contrast	Adjust display contrast in settings; ensure proper power supply.

Factory Reset: Press and hold OK key during boot to restore defaults.

Support: www.yealink.com; contact your service provider for configuration assistance.