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Yealink T4 Series SIP Phones

• 4.3" 480 x 272-pixel color display with backlight
• Dual USB ports
• Dual firmware images
• T4U Auto-P template unified
• T4U firmware unified
• Up to 16 SIP accounts
• Dual-port Gigabit Ethernet
• PoE support
• USB headset and EHS support
• Wi-Fi via WF40/WF50
• Bluetooth via BT40/BT41/BT51
• USB recording
• Supports color-screen expansion modules
• Stand with two adjustable angles
• Wall mountable
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Audio FeaturesPhone FeaturesDirectoryIP-PBX FeaturesDisplay and IndicatorFeature keysFeature keysInterfaceOther Physical FeaturesNetwork and SecurityManagement

Audio Features

  • HD voice: HD handset, HD speaker
  • Hearing aid compatible (HAC) handset
  • Acoustic Shield
  • Smart Noise Filtering
  • Wideband codec: AMR-WB (optional), G.722
  • Narrowband codec: AMR-NB (optional), PCMU(G.711µ), PCMA (G.711A), G.723, G.723.1, G.729, G.729A, G.729B, 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 

Phone Features

  • 10-way conferencing
  • Direct IP call without SIP proxy
  • Ring tone selection/import/delete
  • Set the date and time manually or automatically
  • Dial plan, XML Browser, Action URL/URI
  • RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)
  • Dual USB ports (2.0 compliant)
  • - Bluetooth headset through BT40/BT41/BT51 Support Yealink Bluetooth headset BH71/BH71 Workstation/ BH71 Workstation Pro/BH72/BH76/UH38 through BT51
  • - DECT wireless headset (Yealink WH62 Portable/WH63 Portable)
  • - Contact synchronization through BT40/BT41/BT51
  • - Simultaneous connection of one headset and one mobile phone through BT40/BT41/BT51
  • - Wi-Fi through WF40/WF50
  • - USB call recording through a USB flash drive
  • - USB headset
  • - Expansion Module EXP43
  • - Wireless Headset Adapter EHS40
  • USB/Bluetooth connectivity to Yealink CP900/CP700 speakerphone/wireless headset UH38, USB connectivity to Yealink wired headset UH34/UH36/UH37:
  • - Basic functions: Answer/end, call mute
  • - Enhanced function: audio optimization, redial, call hold, volume synchronization, multiple calls control
  • Enhanced DSS key

Directory

  • Local phonebook up to 1000 entries
  • Blocklist
  • 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 Appearance (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

  • 4.3" 480 x 272-pixel color display with backlight
  • 16-bit depth color
  • LED for call and message waiting for 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
  • Wallpaper, Screensaver, Power saving

Feature keys

  • 10-line keys with LED
  • 10-line keys can be programmed up to 27 paperless DSS keys (3-page view)
  • 7 features keys: message, headset, hold, mute, transfer, redial, hands-free speakerphone
  • 4 context-sensitive “soft” keys
  • 6 navigation keys
  • Volume control keys
  • Illuminated mute key
  • Illuminated headset key
  • Illuminated hands-free speakerphone key

Feature keys

  • 10-line keys with LED
  • 10-line keys can be programmed up to 27 paperless DSS keys (3-page view)
  • 7 features keys: message, headset, hold, mute, transfer, redial, hands-free speakerphone
  • 4 context-sensitive “soft” keys
  • 6 navigation keys
  • Volume control keys
  • Illuminated mute key
  • Illuminated headset key
  • Illuminated hands-free speakerphone key

Interface

  • Dual-port Gigabit Ethernet
  • Power over Ethernet (IEEE 802.3af), class 3
  • 2 x USB port (2.0 compliant)
  • 1 x RJ9 (4P4C) handset port
  • 1 x RJ9 (4P4C) headset port

Other Physical Features

  • Color: Classic Grey
  • Stand with 2 adjustable angles
  • Wall mountable
  • External Yealink AC adapter (optional): AC 100-240 V input and DC 5 V/2 A output
  • USB output currency: 5 V 1 A
  • Power consumption (PSU): 1.2-3.0 W
  • Power consumption (PoE): 1.6-3.8 W
  • Dimension (W*D*H*T): 244 × 213 × 185 × 54 mm
  • Operating humidity: 5% to 90%, noncondensing
  • Operating temperature: -10 to +45°C (+14 to 113°F)
  • Storage temperature: -30 to +70°C (-22 to +158°F)

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 DSC
  • SRTP for voice
  • Transport Layer Security (TLS 1.3)
  • HTTPS certificate manager
  • AES encryption for configuration file (AES256)
  • Digest authentication: MD5/SHA1/SHA224/SHA256/SHA384/SHA512
  • OpenVPN, IEEE802.1X, L2TP VPN
  • IPv6
  • LLDP/CDP/DHCP VLAN
  • ICE
  • WPA2/WPA3
  • Secure boot
  • GARP (Generic Attribute Registration Protocol)

Management

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

Easy returns

Free 30-day returns with quick refunds or easy exchanges and no stress.

Free shipping

Enjoy fast, free shipping on all orders, no minimum, no hidden fees.

Secure payment

Your information is protected with encrypted checkout and trusted payment methods.

Quality assured

Every product is carefully tested to meet high standards of durability and performance.

Why Irish Businesses Choose Cloud & VoIP Phone Systems

Cloud-based phone systems reduce cost, improve flexibility, and make your business look more professional from day one.

 Lower monthly costs than traditional landlines and on-premise PBX maintenance

  Remote & hybrid ready — answer calls anywhere using your business number

 Faster setup with minimal disruption (ideal for office moves and new sites)

 Scales easily — add users, numbers, and features as your team grows

 Better customer experience with IVR, ring groups and call queues

 Insights & control with call logs and reporting for performance tracking

If you’re comparing providers (VoIPLine, NUACOM, Conversation Piece, IP Telecom, GoldStar), the difference is in support, setup quality, and how well the call flows are designed — not just the monthly price.

Ready to Upgrade Your Business Communication?

Talk to us today - we'll guide you through your best options


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