Yealink SIP-T44U Technical Specifications

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

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 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 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 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