Yealink SIP-T42S

Easy Customisation and High Expansibility
Ideally Powerful and Expandable Office Phone

The SIP-T42S IP phone is a dynamic business communications tool for superior voice communications and extended functionality. It has a faster, more responsive interface than the T42G and offers better overall performance. The SIP-T42S is a 12-line IP Phone with multiple programmable keys for enhancing productivity. It is with Yealink Optima HD Voice Technology and wideband codec of Opus for superb sound quality and crystal clear communications. What’s more, the SIP-T42S is built with Gigabit Ethernet technology for rapid call handling. Plus, with an all-new USB port, the SIP-T42S boasts unparalleled functionality and expansibility with Bluetooth, Wi-Fi and USB recording features. The new T4S series offers the same elegant appearance of the T4 line, but with improvements for greater interoperability and collaboration.


Optima HD audio technologies, industry-leading acoustic clarity and newly-added support for Opus* to its broad audio codec list, the Yealink T4S guarantees a lifelike collaboration experience.


By supporting Opus, Yealink T4S series delivers better audio quality in both high-bandwidth and poor network conditions, compared to other wideband or narrowband codecs.


The T42S is equipped with a built-in USB Port to support extended functions as USB Call Recording.


Enables Bluetooth connectivity for more flexibility and functionalities.


Enables Wi-Fi connectivity for more flexibility and functionalities.

Effortless Configuration and Upgrade
The Yealink T4S supports efficient provision and effortless mass deployment with Yealink’s free Redirection and Provisioning Service(RPS). Furthermore, the T4S features a unified firmware and an auto-p template that apply to all phone models (T41S, T42S, T46S and T48S), saving even more time and IT costs for businesses.

Remarkable User Experience
The Yealink T4S series delivers excellent stability and performance with its latest advanced components. The phones feature an optimized interface for a smartphone-like user experience. Its rich one-touch soft keys allow for customization, bringing additional convenience and increasing productivity.

Elegant Industrial Design
The cutting-edge design of the Yealink T4S series includes telephony superiority as well as an elegant appearance. The use of premium materials testifies to its manufacturing excellence.

Additional Convenience and Flexibility
In addition to the T46S and the T48S, the new T41S and T42S are equipped with a built-in USB port, meaning the entire T4S series supports extended functions such as USB call recording, Bluetooth and Wi-Fi connectivity for more flexibility and functionalities.

Audio Features

● HD voice: HD handset, HD speaker
● Hearing aid compatible (HAC) handset
● Wideband codec: AMR-WB (optional), Opus*, G.722
● Narrowband codec: AMR-NB (optional), Opus*,
G.711(A/µ), G.723.1, G.729, G.729A, G.726, iLBC
● DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO
● Full-duplex hands-free speakerphone with AEC

Phone Features

● 12 VoIP accounts
● One-touch speed dial, redial, call forward, call waiting
● Call transfer, call hold, call return, group listening
● Mute, auto answer, DND, 3-way conference call
● Direct IP call without SIP proxy
● Ring tone selection/import/delete
● Hotline, emergency call
● Set date time manually or automatically
● Dial plan, XML Browser, Action URL/URI
● RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)
● USB port (2.0 compliant):
– Bluetooth earphone through BT40/BT41,
– Contact synchronization through BT40/BT41,
– Wi-Fi through WF40/WF50,
– USB call recording through USB flash drive
● USB connectivity to Yealink UH36 headset:
– Basic functions: Answer / end, call mute
– Enhanced function: audio optimization, redial, call
hold, volume synchronization, multiple calls control
● Enhanced DSS key


● Local phonebook up to 1000 entries
● Black list
● XML/LDAP remote phonebook
● Smart dialing
● Phonebook search/import/export
● Call history: dialed/received/missed/forwarded

IP-PBX Features

● Busy Lamp Field (BLF), Bridged Line Apperance (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

Display and Indicator

● 2.7″ 192×64-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

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


● Dual-port Gigabit Ethernet
● Power over Ethernet (IEEE 802.3af), Class 2
● 1 x USB port (2.0 compliant)
● 1 x RJ9 (4P4C) handset port
● 1 x RJ9 (4P4C) headset port
● 1 x RJ12 (6P6C) EHS port

Other Physical Features

● Color: Classic Grey
● Stand with 2 adjustable angles
● Wall mountable
● External Yealink AC adapter (optional):
AC 100~240V input and DC 5V/1.2A output
● Power consumption (PSU): 1.7-3.2W
● Power consumption (PoE): 2.5-4.7W
● Dimension (W*D*H*T):
● Operating humidity: 10~95%
● Operating temperature: -10~50°C (+14~122°F)


● Configuration: browser/phone/auto-provision
● Auto provision via FTP/TFTP/HTTP/HTTPS for
mass deploy
● Auto-provision with PnP
● 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
● QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS
● SRTP for voice
● Transport Layer Security (TLS)
● HTTPS certificate manager
● AES encryption for configuration file
● Digest authentication
● OpenVPN, IEEE802.1X
● IPv6

Package Features

● Package content:
– Yealink SIP-T42S 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: 6.4 kg
● G.W/CTN: 7.0 kg
● Giftbox size: 246mm*223mm*120mm
● Carton Meas: 627mm*256mm*235mm

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