Yealink SIP-T42U | Desktop phone

12 SIP accounts, 2.7" 192x64-pixel graphical LCD with backlight, Dual USB ports, 2x Gigabit LAN Ports, USB headset and EHS support, Supports EXP43 DSS modules, Wi-Fi/Bluetooth support, without PSU, PoE

  • 2.7" 192x64-pixel graphical LCD with backlight 
  • Dual USB ports 
  • Dual firmware images 
  • Opus codec support 
  • T4U Auto-P template unified 
  • T4U firmware unified 
  • Up to 12 SIP accounts 
  • PoE support
  • Dual-port Gigabit Ethernet 
  • USB headset and EHS support 
  • Wi-Fi via WF40/WF50 
  • Bluetooth via BT40/BT41 
  • Stand with 2 adjustable angles 
  • Wall mountable

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

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

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

Audio Features:

  • HD voice: HD handset, HD speaker 
  • Hearing aid compatible (HAC) handset 
  • Acoustic Shield 
  • Wideband codec: AMR-WB (optional), Opus, G.722 
  • Narrowband codec: AMR-NB (optional), Opus, G.711(A/µ), G.723.1, 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

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 DSCP 
  • SRTP for voice 
  • Transport Layer Security (TLS) 
  • HTTPS certificate manager 
  • AES encryption for configuration file 
  • Digest authentication 
  • OpenVPN, IEEE802.1X 
  • IPv6 
  • LLDP/CDP/DHCP VLAN 
  • ICE

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, auto answer, DND, hoteline 
  • 5-way conference call 
  • Direct IP call without SIP proxy 
  • Ring tone selection/import/delete 
  • Set date time manually or automatically 
  • Dial Plan, XML Browser, Action URL/URI 
  • RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035) 
  • Dual USB ports (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 headset 
  • Wireless Headset Adapter EHS40 
  • Enhanced DSS key

Directory

  • 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

Management:

  • Configuration: browser/phone/auto-provision 
  • Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy 
  • 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

String Optional