The T42S is a feature-rich business tool for superior communications and extended functionality, which is ideal for common area use and for staff in the call center. It offers a faster, more-responsive interface than the T42G and several performance-enhancing functions.

The T42S with Yealink Optima HD Voice technology and SILK codec delivers superb audio quality and crystal clear voice communications. Meanwhile, it supports Conferencing, Boss/Admin, Common Area Phone, Calendar, Hot-desking and other productivity-enhancing functions. Its class2 PoE (power over Ethernet) helps to reduce its carbon footprint and its Gigabit Ethernet technology is built for rapid call handling. The model is wall-mountable and can be paired with Yealink YHS32 headset and other major brand headsets via the Yealink EHS36 Wireless Headset Adapter.

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  • Optima HD Voice
  • 2.7" 192 x 64-pixel backlit LCD
  • SILK Speech Codec support
  • USB 2.0
  • Compatible with Office 365
  • Calendar, Boss/Admin support
  • Common Area Phone
  • Meet Now
  • QoE (monitoring reports)
  • PoE support
  • Headset, EHS support
  • Wall mountable

Audio features
Yealink Optima HD Voice : HD handset, HD speaker
Full-duplex hands-free speakerphone with AEC
Codecs: SILK, G.722, G.711 (A/µ), G.723, G.729AB, G.726, GSM, iLBC
DTMF: In-band, Out-of-band (RFC 2833) and SIP INFO

Contacts synchronize with client
View SFB contacts and their current presence status
Support local contacts
Support global search, compatible with exchange
Smart dialing
Call history: placed/received/missed/forwarded

Signing into Skype for Business
Sign in: User Credentials/PIN Authentication
Signing in via BToE
Signing in via web user interface
Web Sign-in
Auto root certificate fetch

BToE features
Click to call/Click to answer
Audio device switch from IP Phone to PC
Wireless pairing with PC client
As a PC Audio device

Phone features
Presence status synchronize with client
Reset presence status, privacy mode
Phone lock
Favorite contacts sorting
Favorite contacts click to call
Call hold, call waiting, call merge, redial, mute
Branch office support
Group call pickup
Music on hold
Call forward, call transfer, call park
SFB conferencing (Microsoft CCCP)
Boss/Admin function
Common Area Phone (CAP)
Calendar function, Outlook meeting schedules synchronization
Hot-desking, paging, hotline
E911, Multiple Emergence Number
Federation, response group, private line
Ring tone, dial plan, visual voicemail
Message waiting indicator (MWI)
Volume adjustment
USB port (2.0 compliant):
 - Bluetooth earphone through BT40,
 - Wi-Fi through WF40 (pending),
 - USB call recording through USB flash drive (pending)

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

Display and indicator
2.7" 192 x 64-pixel graphical LCD with backlight
LED for call and message waiting indication
Multilingual user interface
Caller ID with name, number
Presence status control: available, busy, DND, be right back, off work, appear away

Network and security
SIP v1 (RFC2543), v2 (RFC3261)
Proxy mode and peer-to-peer SIP link mode
IP Assignment: Static/DHCP
DNS Assignment: Static/DHCP
HTTP/HTTPS web server
Time and date synchronization using SNTP
QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS, DSCP
SRTP for voice
Transport Layer Security (TLS)
EWS authentication
HTTPS certificate manager
Digest authentication using MD5/MD5-sess

Configuration: browser/phone/Auto provisioning
Yealink Redirection and Provisioning Service (RPS)
Auto Provisioning via Activation Code
In-band provisioning
In-Band Configuration Management
QoE (Monitoring Reports)
Single identity (active directory)
Media Bypass
Firewall Traversal
Reset to factory, reboot
Package tracing export, system log
Screenshot via URL
Phone log click to upload
View license status
UnifySquare Device Management

Other physical features
External Yealink AC adapter (optional): AC 100~240V input and DC 5V/1.2A output
Power consumption (PSU): 1.4-2.8W
Power consumption (PoE): 2.1-3.9W
Dimension (W*D*H*T): 212mm*189mm*175mm*54mm
Operating humidity: 10~95%
Operating temperature: -10~50°C (+14~122°F)

Package features
Package content:
- Yealink T42S Skype for Business 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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