Yealink Phone T42G Manual

The Yealink T42G is a high-performance IP phone designed for business environments, featuring a 4.3-inch color LCD screen, support for up to 12 SIP accounts, HD voice quality, dual Gigabit Ethernet ports, PoE support, integrated Bluetooth, and advanced call management 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 Call Features 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 4.3-inch color LCD, Handset, Base unit, Ethernet ports, Power adapter, Handset cord.

Feature	Description
Display	4.3-inch color LCD with 480 x 272 resolution
Network Ports	Dual Gigabit Ethernet (LAN and PC)
Power	IEEE 802.3af PoE or external power adapter
Bluetooth	Integrated Bluetooth 4.2 for headset connectivity
HD Voice	Wideband audio support for superior call quality
SIP Accounts	Support for up to 12 SIP accounts
Codecs	G.722, G.711, G.729, G.726, iLBC, Opus
Expansion Module	Support for Yealink EXP40 expansion module
Conference Calls	3-way conference calling capability
Security	SRTP, TLS, 802.1x authentication

Installation

Unpack and inspect contents. Place on stable surface.

Connect to Network: Use Ethernet cable to connect LAN port to network switch/router.
Connect PC: Use second Ethernet cable from PC port to computer (optional).
Power Connection: Use PoE from switch or connect external power adapter to DC port.
Connect Handset: Plug handset cord into handset port on base unit.

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

First-Time Setup

Power on phone; follow on-screen prompts.

Network Configuration: Phone will attempt DHCP. For static IP, press Menu > Settings > Network.
SIP Account Setup: Enter SIP server, username, password provided by your service provider.
Date & Time: Set time zone and NTP server for automatic time synchronization.
Audio Settings: Adjust handset, speakerphone, and ringtone volume to preference.

CAUTION! Handle handset cord carefully to avoid damage to connectors.

Specifications

Display: 4.3-inch color TFT LCD, 480 x 272 pixels.
Network: Dual 10/100/1000 Mbps Ethernet ports, IEEE 802.3af PoE.
Protocols: SIP 2.0 (RFC3261), TCP/IP, UDP, RTP, RTCP, HTTP, HTTPS.
Audio Features: HD voice, full-duplex speakerphone, acoustic echo cancellation.
Bluetooth: Version 4.2, support for headsets and mobile devices.
Physical Interfaces: Handset port, headset port (RJ9), USB port.
Power Supply: Input: 100-240V AC, 50/60Hz; Output: 12V DC, 0.5A.
Operating Temperature: 0°C to 40°C (32°F to 104°F).
Dimensions: 220mm x 200mm x 60mm (W x D x H).

Controls and Settings

Access menu via dedicated Menu button or touch screen. Front Panel: LCD screen, navigation keys, volume keys, mute button, headset button, speakerphone button.

Soft Keys: Context-sensitive buttons below display for call functions.

Basic Settings: Time/Date, Language (English default), Screen brightness, Ringtone selection. Network: WAN/LAN configuration, VLAN settings, QoS. Account: SIP registration, call forwarding, voicemail. Audio: Handset volume, speaker volume, ring volume, codec priority. Security: Admin password (default: admin), user password, encryption settings.

Connecting Devices

Network: Ethernet cable to LAN port. PC: Ethernet cable from PC port. Headset: RJ9 connector to headset port. Bluetooth: Pair compatible headset via Menu > Settings > Bluetooth.

Ensure phone is powered off before connecting cables.
Match cables to correct ports (Ethernet to LAN, handset to handset port).
For Bluetooth pairing, enable discovery mode on headset first.

Tip: Use Cat5e or better Ethernet cables for optimal network performance.

Advanced Call Features

Supports call hold, transfer, forwarding, conference, and more.

Make Call: Lift handset or press Speakerphone, dial number.
Answer Call: Lift handset, press Speakerphone, or press Answer soft key.
Call Hold: Press Hold button during active call.
Call Transfer: Press Transfer, dial target number, press Transfer again.
3-Way Conference: During active call, press Conference, dial third party, press Conference again.
Call Forwarding: Configure via Menu > Features > Call Forward.
Voicemail: Press Messages button or dial voicemail access number.
Directory: Store up to 1000 contacts with quick dial capability.

WARNING! Do not use phone during electrical storms. Use surge protector.

Accessibility Features

Visual Alert: Flashing LED for incoming calls. Audio Adjustment: Separate volume controls for handset, speaker, ringer. Large Font: Option for larger text on display. High-Contrast Theme: Available in display settings.

Care & Cleaning

Unplug power 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 away from excessive heat and humidity.

Regulatory Information

FCC Part 15: Class A digital device; complies with limits for business environments. CE, RCM, UKCA marked. Contains FCC ID: 2AL6B-T42G. 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	Power source/cable	Check power adapter connection; verify PoE switch is working; try different outlet.
No network connection	Cable/DHCP	Check Ethernet cable; verify network port activity; restart phone.
No dial tone	SIP registration	Check account credentials; verify SIP server address; contact service provider.
Poor audio quality	Network/Codec	Check network bandwidth; adjust QoS settings; try different codec.
Bluetooth not connecting	Pairing mode/distance	Ensure headset in pairing mode; move closer to phone; restart both devices.

Factory Reset: Press and hold OK button during boot (10 seconds) to restore defaults.

Support: www.yealink.com; firmware updates available from support portal.