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.723.1, 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
Display and Indicator
• 2.8” 320x240-pixel color 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
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, DND
• Auto answer
• Hoteline
• 5-way conference call
• 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
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, call recording
• Visual voice mail
Directory
• Local phonebook up to 1000 entries
• Blocklist
• XML/LDAP remote phonebook
• Smart dialing
• Phonebook search/import/export
• Call history: dialed/received/missed/forwarded
Feature keys
• 8-line keys with LED
• 8-line keys can be programmed up to 21 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
Interface
• Dual-port Gigabit Ethernet
• Power over Ethernet (IEEE 802.3af), class 3
• 1 x RJ9 (4P4C) handset port
• 1 x RJ9 (4P4C) headset port
• 2 x USB port (2.0 compliant)
Management
• Configuration: browser/phone/auto-provision
• Auto provision via FTP/TFTP/HTTP/HTTPS for mass deployment
• Auto-provision with PnP
• Zero-sp-touch, TR-069
• Phone lock for personal privacy protection
• Reset to factory, reboot
• Package tracing export, system log
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 1.3)
• HTTPS certificate manager
• AES encryption for configuration file (AES256)
• Digest authentication
• OpenVPN, IEEE802.1X, L2TP VPN
• IPv6
• LLDP/CDP/DHCP VLAN
• ICE
• WPA2/WPA3
• Secure boot
• GARP (Generic Attribute Registration Protocol)
Other Physical Features
• Color: Classic Grey
• Stand with 2 adjustable angles
• Wall mountable
• External Yealink AC adapter: AC 100-240 V input and DC 5 V/1.2 A output
• USB output currency: 5 V 500 mA
• Power consumption (PSU): 1.7 W - 4.1 W
• Power consumption (PoE): 2.0 W - 4.9 W
• Dimension (W*D*H*T): 215 × 206 × 174.9 × 52 mm
• Operating humidity: 10~95%
• Operating temperature: -10 to +45°C (+14 to 113°F)
• Storage temperature: -30 to +70°C (-22 to +158°F)
Package Features
• Package content:
- Yealink SIP-T44U IP phone
- Handset with handset cord
- Ethernet Cable (optional)
- Stand (not applicable to US wall plate Standard)
- Quick Start Guide
- Power Adapter
• Qty/CTN: 5PCS
• N.W/CTN: 5.764 kg
• G.W/CTN: 6.352 kg
• Giftbox size: 239 × 223 × 115 mm
• Carton Meas: 595 × 230 × 248 mm