Yealink T27G Phone Manual

The Yealink T27G is a feature-rich business IP phone designed for modern VoIP communications. It features a 3.5-inch color LCD screen, HD voice quality, dual Gigabit Ethernet ports, support for up to 12 SIP accounts, PoE compatibility, integrated Bluetooth, and a wide range of telephony features including call transfer, conference, and advanced call management. 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: 3.5-inch color LCD, Handset, Base unit, Ethernet ports, Power adapter, Mounting bracket.

Feature	Description
Display	3.5-inch color LCD with backlight
Voice Quality	HD Voice with wideband audio
Network Ports	Dual Gigabit Ethernet (LAN & PC)
Power Options	PoE (802.3af) or AC adapter
Bluetooth	Integrated for headset connectivity
SIP Accounts	Supports up to 12 lines
Headset Port	3.5mm jack for wired headset
Conference	3-way audio conference
Volume Controls	Dedicated buttons for handset, speaker, ringer
Programmable Keys	Up to 4 programmable line keys

Installation

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

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 AC power adapter.
Connect handset: Plug coiled handset cord into handset port.

WARNING! Use only Yealink-approved power adapter. Ensure proper ventilation around the phone.

First-Time Setup

Power on phone; follow on-screen prompts.

Network configuration: Phone will attempt DHCP; check IP address on screen.
Provisioning: Enter SIP server details provided by your service provider.
Account registration: Configure SIP accounts with username/password.
Date & Time: Set time zone and synchronization method (NTP).

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

Specifications

Display: 3.5-inch TFT color LCD (320 x 240 pixels).
Audio Codecs: G.722, G.711, G.729, G.726, iLBC, Opus.
Network Protocols: SIP, TCP/IP, UDP, RTP, RTCP, DHCP, DNS.
Ethernet: Dual 10/100/1000 Mbps ports with PoE (802.3af).
Bluetooth: Version 3.0+EDR for wireless headset.
Supported Features: Call hold, transfer, forward, conference, DND.
Power Supply: 100-240V AC, 50/60Hz or PoE.
Operating Temp: 0°C to 40°C (32°F to 104°F).

Controls and Settings

Access menu via MENU button. Front Panel: LCD screen, navigation keys, soft keys, volume buttons, mute, headset, speakerphone.

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

Settings: Network (IP, DHCP, VLAN), Audio (handset, speaker, ringer volume), Time (time zone, NTP), Account (SIP server, registration), Features (call forward, DND, auto answer). Advanced: Firmware upgrade, restore factory defaults (password: admin).

Connecting Devices

Network: Ethernet cable to LAN port. Headset: 3.5mm wired or Bluetooth wireless. PC: Ethernet cable to PC port.

Turn off phone before connecting cables.
Match cables to correct ports (Ethernet to LAN, headset to headset jack).
For Bluetooth: Enable in menu > Bluetooth > Pair device.

Tip: Use Cat5e or higher Ethernet cables for Gigabit connection.

Advanced Call Features

Supports standard and advanced telephony functions.

Make call: Lift handset or press speakerphone, dial number.
Answer call: Lift handset, press speakerphone, or press Answer soft key.
Hold: Press HOLD button during active call.
Transfer: Press TRANSFER, dial target number, press TRANSFER again.
Conference: During first call, press CONFERENCE, dial second party, press CONFERENCE again.
Call forward: Configure in menu > Features > Call Forward.
Redial: Press REDIAL to call last dialed number.
Directory: Press DIR to access phonebook and call logs.

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

Accessibility Features

Visual alerts: LED indicators for missed calls/messages. Audio adjustments: Separate volume controls for handset, speaker, ringer. Hearing aid compatible: Handset meets TIA-1083 standard.

Care & Cleaning

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

CAUTION! Avoid liquids entering phone openings; keep away from excessive dust.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. CE, RCM, UKCA marked. Contains FCC ID: 2AJMT-T27G. For support, visit www.yealink.com or contact your service provider. Copyright © Yealink Network Technology Co., Ltd.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No power	Power source/cable	Check PoE switch or AC adapter connection; try different cable.
No network	Cable/DHCP	Verify Ethernet cable; check router/switch; confirm DHCP enabled.
No registration	SIP credentials	Verify username/password; check SIP server address/port.
No audio	Volume/mute	Adjust volume; check mute status; verify handset connection.
Bluetooth not pairing	Distance/settings	Ensure headset in pairing mode; phone Bluetooth enabled; within range.

Reset: Press and hold OK key during boot for factory reset.

Service: Contact service provider or visit www.yealink.com/support