Yealink SIP-T48U | Desktop phone

• 7" 800 x 480-pixel color touch screen with backlight 
• Opus codec support 
• 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 
• Paperless label design 
• Headset, EHS support 
• Wi-Fi via WF40/WF50 
• Bluetooth via BT40/BT41 
• USB recording 
• Supports color-screen expansion modules 
• Stand with two adjustable angles 
• Wall mountable

Display and Indicator:

• 7" 800 x 480-pixel color touch screen with backlight 
• 24 bit depth color 
• 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

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

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

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

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:

• 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) 
• USB port (2.0 compliant) for: 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 
• Executive and Assistant 
• Call park, call pickup 
• Centralized call recording, call recording 
• Visual voice mail

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

Other Physical Features:

• Color: Classic Grey 
• Wall mountable (optional) 
• 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)