Yealink T42S

The Yealink T42S is an ultra-functional professional tool that delivers high-definition audio quality.
Its user-oriented interface is faster, more responsive and offers unprecedented performance improvements.

For more details:
Data sheet

High-definition sound

Yealink Optima HD Voice technology combines state-of-the-art hardware with broadband technology for optimal acoustic performance.
With Opus, a codec designed to deliver HD audio quality, you get a quality that's superior to other broadband codecs.

Facilitated call management

Equipped with a brand-new USB port, the SIP-T42S is powerful, expandable and ready for recording functions and Bluetooth dongle support.

Simplify your installation

Thanks to its auto-provisioning feature, the T42S offers you flexibility and effortless large-scale deployment.
The new common firmware on the range ensures consistency across your fleet.

Data sheet

Audio codecs

Broadband: G.722
Narrowband: G.711 / G.729a
Dual-Tone Multi-Frequency (DTMF): In-band, Out-of-band (RFC 2833) and SIPINFO
Full-duplex Acoustic Echo Compensator (AEC) speaker


One-touch dialing and quick redial
Call forwarding, call in wait
Call transfer, put call in wait
Callback, group listening
Discretionary mode, automatic response
Do Not Disturb (DND)
3-way conferencing
1 USB port
- Bluetooth support via BT40
- Call recording on USB
Anonymous calling, anonymous call rejection
Shared office, voicemail
Visual voicemail
Call recording


Local directory with up to 1000 entries
Remote Directory XML/LDAP
Smart Dialing
Directory search/import/export
Call history: dialed/received/missed/transferred

Display & Indicator

192 x 64 pixel backlit LCF display
Message and call waiting indicator light
Two-colour (red and green) LEDs for line status information
Intuitive user interface with icons and programmable keys

Function key

Up to 12 line keys
Up to 15 monitoring  keys (displayed on 3 pages)
5 function keys: message, headset, silent mode, auto redial, hands-free speakerphone
4 context-sensitive keys
6 navigation keys
2 volume control keys
Illuminated mute mode key
Illuminated headset key
Illuminated hands-free speakerphone key


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