Yealink SIP-T48U Technical Specification

Audio Features

• HD voice: HD handset, HD speaker
• Hearing aid compatible (HAC) handset
• Acoustic Shield
• Smart Noise Filtering
• Codecs: AMR-WB (optional), AMR-NB (optional), Opus, G.722, 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

Phone Features

• 16 VoIP accounts
• Call hold, mute, DND
• One-touch speed dial, hotline
• Call forward, call waiting, call transfer
• Group listening
• Emergency call
• Redial, call return, auto answer
• 10-way conferencing
• 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
  - Simultaneous connection of one headset and one mobile phone through BT40/BT41
  - 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, USB connectivity to Yealink UH36 headset:
  - 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
• 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
• Call park, call pickup
• Executive and Assistant
• Centralized call recording
• Visual voice mail
• Call recording

Display and Indicator

• 7" 800 x 480-pixel colour touch screen with backlight
• 24 bit depth colour
• LED for call and message waiting indication
• Wallpaper
• Intuitive user interface with icons and soft keys
• Multilingual user interface
• Caller ID with name, number and photo
• Screensaver
• Power saving

Feature keys

• 29 one-touch DSS keys
• 7 features keys: message, headset, hold, mute, transfer, redial, hands-free speakerphone > 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

• Colour: Classic Grey
• Wall mountable
• External Yealink AC adapter (optional): AC 100~240V input and DC 5V/2A output
• USB output currency: 5V 1A
• Power consumption (PSU): 1.8-3.8W
• Power consumption (PoE): 2.3-4.7W
• Dimension (W*D*H*T): 266mm*226mm*185mm*54mm
• Operating humidity: 10~95%
• Operating temperature: -10~50°C (+14~122°F)

Management

• Configuration: browser/phone/auto-provision
• Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy
• 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)
• HTTPS certificate manager
• AES encryption for configuration file
• Digest authentication
• OpenVPN, IEEE802.1X
• IPv6
• LLDP/CDP/DHCP VLAN
• ICE

Package Features

• Package content:
  - Yealink SIP-T48U IP 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: 7.9 kg
• G.W/CTN: 8.4 kg
• Giftbox size: 324mm*263mm*128mm
• Carton Meas: 660mm*338mm*273mm