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Yealink T42U

Yealink T42U


The Yealink T42U is a feature-rich business IP phone designed for reliable, professional VoIP communication in offices. This Yealink SIP phone supports up to 12 SIP accounts, making it suitable for busy users who manage multiple lines and calls. With Yealink Optima HD Voice, Acoustic Shield and Smart Noise Filtering, the T42U delivers clear, focused audio for everyday business conversations.

It features a 2.7-inch backlit display, programmable keys, 5-way conference calling, call transfer, call forwarding and call hold for efficient call management. Dual Gigabit Ethernet ports and Power over Ethernet (PoE) simplify connectivity & installation. Its dual USB ports support headsets, Bluetooth, Wi-Fi & call recording. For businesses seeking a dependable VoIP phone, SIP desktop phone or office IP phone in Ireland, the Yealink T42U offers flexibility & productivity.

Key Features and Benefits

• 2.7" 192x64-pixel graphical LCD with backlight
• Dual USB ports
• Dual firmware images
• T4U Auto-P template unified
• T4U firmware unified
• Up to 12 SIP accounts
€ 141.00 € 141.00 (Tax excluded)
€ 141.00 (Tax excluded)

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Audio FeaturesDisplay and IndicatorPhone FeaturesIP-PBX FeaturesDirectoryFeature keysInterfaceManagementNetwork and SecurityOther Physical FeaturesPackage Features

Audio Features

> HD voice: HD handset, HD speaker

> Hearing aid compatible (HAC) handset

> Acoustic Shield

> Smart Noise Filtering

> Wideband codec: AMR-WB (optional), G.722

> Narrowband codec: AMR-NB (optional), PCMU(G.711µ), PCMA (G.711A), G.723, G.723.1, G.729, G.729A, G.729B, G.729AB, G.726, iLBC

> DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO

> Full-duplex hands-free speakerphone with AEC

> VAD, CNG, AEC, PLC, AJB, AGC

Display and Indicator

> 2.7" 192x64-pixel graphical LCD with backlight

> LED for call and message waiting indication

> Dual-color (red or green) illuminated LEDs for line status information

> Intuitive user interface with icons and soft keys

> Multilingual user interface

> Caller ID with name and number

> Power saving

Phone Features

> 12 VoIP accounts

> One-touch speed dial, redial

> Call forward, call waiting, call transfer, call hold

> Call return, group listening

> Emergency call

> Mute, DND

> Auto answer

> Hoteline

> 5-way conference call

> Direct IP call without SIP proxy

> Ring tone selection/import/delete

> Set the date and time manually or automatically

> Dial Plan

> XML Browser, Action URL/URI

> RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)

> Dual USB ports (2.0 compliant)

- Bluetooth headset through BT40/BT41/BT51 Support Yealink Bluetooth headset BH71/BH71 Workstation/BH71 Workstation Pro/BH72/BH76/UH38 through BT51

- DECT wireless headset (Yealink WH62 Portable/WH63 Portable)

- Contact synchronization through BT40/BT41/BT51

- Simultaneous connection of one headset and one mobile phone through BT40/BT41/BT51

- Wi-Fi through WF40/WF50

- USB call recording through a USB flash drive

- USB headset

- Wireless Headset Adapter EHS40

> USB/Bluetooth connectivity to Yealink CP900/CP700 speakerphone/wireless headset UH38, USB connectivity to Yealink wired headset UH34/UH36/UH37:

- Basic functions: Answer/end, call mute

- Enhanced function: audio optimization, redial, call hold, volume synchronization, multiple calls control

> Enhanced DSS key


IP-PBX Features

> Busy Lamp Field (BLF), Bridged Line Appearance (BLA)

> Anonymous call, anonymous call rejection

> Hot-desking, voice mail

> Flexible seating, Executive and Assistant

> Call park, call pickup

> Centralized call recording

> Visual voice mail

> Call recording


Directory

> Local phonebook up to 1000 entries

> Blocklist

> XML/LDAP remote phonebook

> Smart dialing

> Phonebook search/import/export

> Call history: dialed/received/missed/forwarded


Feature keys

> 6 line keys with LED

> 6 line keys can be programmed up to 15 paperless DSS keys (3-page view)

> 5 features keys: message, headset, mute, redial, hands-free speakerphone

> 4 context-sensitive “soft” keys

> 6 navigation keys

> 2 volume control keys

> Illuminated mute key

> Illuminated headset key

> Illuminated hands-free speakerphone key

Interface

> 2 x RJ45 10/100/1000M Ethernet ports

> Power over Ethernet (IEEE 802.3af), Class 2

> 2 x USB port (2.0 compliant)

> 1 x RJ9 (4P4C) handset port

> 1 x RJ9 (4P4C) headset port


Management

> Configuration: browser/phone/auto-provision

> Auto provision via FTP/TFTP/HTTP/HTTPS for mass deployment

> Auto-provision with PnP

> Broadsoft device management

> Zero-sp-touch TR-069

> Phone lock for personal privacy protection

> Reset to factory, reboot

> Package tracing export, system log


Network and Security

> SIP v1 (RFC2543), v2 (RFC3261)

> Call server redundancy supported

> NAT traversal: STUN mode

> Proxy mode and peer-to-peer SIP link mode

> IP assignment: static/DHCP

> HTTP/HTTPS web server

> Time and date synchronization using SNTP

> UDP/TCP/DNS-SRV(RFC 3263)

> QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS DSC

> SRTP for voice

> Transport Layer Security (TLS 1.3)

> HTTPS certificate manager

> AES encryption for configuration file (AES256)

> Digest authentication: MD5/SHA1/SHA224/SHA256/SHA384/SHA512

> OpenVPN, IEEE802.1X, L2TP VPN

> IPv6

> LLDP/CDP/DHCP VLAN

> ICE

> WPA2/WPA3

> Secure boot

> GARP (Generic Attribute Registration Protocol)


Other Physical Features

> Colour: Classic Grey

> Stand with 2 adjustable angles

> Wall mountable

> External Yealink AC adapter (optional)： AC 100-240 V input and DC 5 V/1.2 A output

> USB output currency: 5 V 500 mA

> Power consumption (PSU): 0.9-2.2 W

> Power consumption (PoE): 1.3-2.9 W

> Dimension (W*D*H*T): 212 × 189 × 175 × 54 mm

> Operating humidity: 5% to 90%, noncondensing

> Operating temperature: -10 to +45°C (+14 to 113°F)

> Storage temperature: -30 to +70°C (-22 to +158°F)


Package Features

> Package content:

- Yealink SIP-T42U IP phone

- Handset with handset cord

- Ethernet Cable (2m CAT5E UTP Cable)

- Stand

- Quick Start Guide

- Power Adapter (Optional)

- Wall Mount Bracket (Optional)

> Qty/CTN: 5 PCS

> N.W/CTN: 5.8 kg

> G.W/CTN: 6.3 kg

> Giftbox size: 246 × 223 × 120 mm

> Carton Meas: 627 × 256 × 235 mm


Frequently Asked Questions


The Yealink T42U is a feature-rich business IP phone designed for professional office communication. It works with SIP-based VoIP phone systems and supports up to 12 SIP accounts, making it suitable for employees who handle multiple lines or frequent business calls. With HD voice, Acoustic Shield, programmable keys and Gigabit Ethernet, it is a practical Yealink SIP phone for modern phone systems for businesses.

Yes. The T42U is designed specifically for business communication and can be integrated with compatible SIP-based business phone systems and IP-PBX platforms. Its support for multiple SIP accounts, call transfer, call forwarding, call parking, conference calling and voicemail makes it suitable for busy office environments. It is a strong option for businesses looking to upgrade to an IP phone system or modernise existing VoIP phone systems in Ireland.

The Yealink T42U supports up to 12 SIP accounts, making it a versatile multi-line IP office phone for users who need to manage several business numbers or communication channels. It has six physical line keys with LED indicators, which can also be programmed for additional DSS functions. This makes the T42U particularly useful for receptionists, sales teams, customer service staff and other users handling a high volume of calls.

Yes. The T42U supports Power over Ethernet (PoE), allowing power and network connectivity to be provided through a compatible Ethernet connection. This can simplify installation by reducing the need for a separate power cable at each desk. The phone also features two Gigabit Ethernet ports, making it suitable for professional office networks and modern IP phone systems.

Yes. The Yealink T42U uses Optima HD Voice technology and includes Acoustic Shield and Smart Noise Filtering to improve voice clarity in busy office environments. It supports HD handset and speaker audio, as well as full-duplex hands-free calling with acoustic echo cancellation. These features make it a suitable Yealink VoIP phone for businesses where clear and reliable voice communication is important.

Yes. The T42U includes dual USB ports and supports USB headsets, compatible wireless headset solutions and EHS accessories. Optional Bluetooth and Wi-Fi functionality is also available through supported Yealink adapters. This gives businesses flexibility when setting up VoIP phone systems, particularly for employees who spend long periods on calls or prefer hands-free communication.

The Yealink T42U is well suited to businesses and professional users who need a reliable multi-line IP phone with advanced calling features. It is positioned as a mid-range business phone and is suitable for busy office users, reception desks, sales teams, administrators and customer-facing staff. With 12 SIP accounts, HD voice, Gigabit Ethernet, PoE, USB connectivity and IP-PBX features, it can be a strong fit for business phone systems, IP office phone setups and phone systems for businesses that need room to scale.

Real Stories, Real Success


Rating

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Rating

The team at Pulse Telecom are so nice to deal with, professional and efficient. We have an ongoing need for interacting with them for our clients and they are very helpful. I would highly recommend the Pulse Telecom Voip service for reliability, customer support and value. Looking forward to working with Anthony, Philip and the team going forward.

Eamonn John Flynn
Eamonn Flynn of TaxAssist Accountants

Rating

Switching to Pulse Telecom was a game-changer for our office operations. We were struggling with dropped calls and lagging hardware, but their team stepped in and streamlined our entire communication stack. The transition was seamless, the call quality is crystal clear, and their support team actually answers the phone when you need them. It’s rare to find a provider that balances cutting-edge tech with such a human touch.

Martin Jenkinson
Customer

Rating

We are using Pulse Telecom for our office phone system needs and I would highly recommend their services. We have a number of remote working staff in different departments and everything ties in seamlessly.

Colm Murphy
Customer

Rating

Anthony and his Pulse Telecom team are responsive and make it very easy to understand how they work, they have good technical backup and are always offering new and innovative ways to make our business work better, i would have no problem recommending them to any business looking to improve their communications system.

Stephen Finlan
Customer

Rating

My company, Robertson Estates, Donabate,  has been dealing with Pulse Telecom for the handling of our phone system for many years. In that time I found them easy to deal with and there service is second to none while also offering great value for money.

Doug Robertson
Owner of Robertson Estates

Rating

Really great experience dealing with Pulse Telecom. Excellent service, good value for money, and super friendly customer support. Really appreciate all the help!

Ideal House
Customer

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