Yealink T42S SIP telephone

QuickFind: 811577 Mfr part code: T42S
  • Dual-port Gigabit Ethernet
  • 2.7” greyscale graphical backlit LCD
  • HD Voice: HD Codec, HD speaker, HD handset
  • 12 VoIP accounts, BLF/BLA, IPV6, Open VPN

Product Description

Yealink T42S SIP telephone

The stylish, feature-rich T42S entry level business phone is ideal for busy professionals.

The clear display and simple navigation enhances productivity. The dual-port Gigabit Ethernet telephone benefits from an intuitive interface, BLF's, HD Voice, 3-way conferencing, handsfree speakerphone and supports corded or wireless headset and EHS. With simple, flexible and secure provisioning options, the T42S is certified compatible with 3CX, Asterisk and BroadSoft BroadWorks, making it the ideal entry level IP phone for businesses.

Technical Specification

Yealink T42S SIP telephone

IP Telephony

Network Ports Qty 2 x Ethernet 10Base-T/100Base-TX/1000Base-T
Voice Features Comfort noise generation (CNG), voice activity detection (VAD), HD Voice, acoustic echo cancellation (AEC), packet loss concealment (PLC), adaptive jitter buffer (AJB), automatic gain control (AGC)
Network Features Network Address Translation (NAT), Class 2 PoE, Lightweight Directory Access Protocol (LDAP)
Main Features Multiple VoIP protocol support, integrated Ethernet switch
VoIP Yes
VoIP Protocols SIP, SIP v2
Voice Codecs G.722, G.723, G.729ab, G.711u, G.711a, G.726, iLBC, Opus
Lines Supported 12 lines
Quality of Service IEEE 802.1Q (VLAN), Differentiated Services (DiffServ), IEEE 802.1p, Type of Service (ToS)
IP Address Assignment DHCP, static
Security IEEE 802.1X
Power Over Ethernet (PoE) Support Yes
Network Protocols IP, TCP, TFTP, UDP, HTTP, DNS, HTTPS, SRTP, TR-069, SNTP

Phone Memory

Phone Directory Capacity 1000 names & numbers


Type LCD display - monochrome
Display Location Base
Diagonal Size 2.7"
Display Resolution 192 x 64 pixels
Backlit Yes


Connections Headset jack / RJ-9 ¦ Handset jack / RJ-9 ¦ USB ¦ Electronic hook switch (EHS) / RJ-12 ¦ Network / RJ-45
Placing / Mounting Wall-mountable, table-top

Dimensions & Weight (Base)

Width 21.2 cm
Depth 18.9 cm
Height 17.5 cm


Product Type VoIP phone

Phone Features

Call Services Voice Mail, Caller ID, Call Waiting, Call Forwarding, Call Transfer, Call Hold
Dialer Type Keypad
Dialer Location Base
Conference Call Capability 3-way
Speakerphone Yes
Menu Operation Yes
Indicators Visual ringer light, voice message waiting indicator, speakerphone indicator, headset, mute indicator
Additional Functions Built-in clock, call recording, Intercom

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Yealink T42S SIP telephone

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Yealink T42S SIP telephone

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