Features

• 7” 800 x 480 capacitive adjustable touch screen
• Adjustable LCD screen
• Dual firmware images
• T53/T53W/T54W/T57W firmware unified
• Built-in Bluetooth 4.2
• Built-in dual band 2.4G/5G Wi-Fi (802.11a/b/g/n)
• USB 2.0 port for USB recording,wired/wireless USB headsets and EXP50
• Up to 16 VoIP accounts
• Dual-port Gigabit Ethernet
• PoE support
• HAC Handset
• Paperless label design
• Wall mountable

Audio Features
• HD voice: HD handset, HD speaker
• Hearing aid compatible (HAC) handset
• Acoustic Shield
• Smart Noise Filtering
• Audio codec: Opus, G.722, PCMU (G.711A), PCMA (G.711µ), G.729, G.729A, G.729B,G.729AB, G.726,G.723.1, 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
• One-touch speed dial, hotline
• Call forward, call waiting, call transfer
• Mute, DND, call hold, redial, call return, auto answer
• Group listening, SMS, emergency call
• 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)
• Built-in dual band Wi-Fi:
– Network standard: IEEE802.11a/b/g/n
– Transmission rate: Up to 433Mbps (dynamic)
– Frequency range: 2.4GHz/5.0GHz
• Built-in Bluetooth for:
– Bluetooth headset,
– Mobile contacts synchronization
– Bluetooth call
– Simultaneous connection of one headset and one mobile phone
• USB port (2.0 compliant) for:
– Wired/wireless USB headset
– USB call recording through USB flash drive
– Color-screen expansion modules EXP50 (up to 3)
– 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
• Content Sharing (via Yealink VCD)
• 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

Corded-Cordless Phone (via DECT Dongle DD10K)
• Up to 4 DECT cordless handsets
• Up to 4 concurrent calls
• Support Yealink W52H/W53H/W56H/DD Phone/CP930W
• Slave Handset for Master Deskset

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

Display and Indicator
• 7″ 800 x 480 capacitive adjustable touch screen
• LED for call and message waiting indication
• Dual-color (red or green) illuminated LEDs for line status information
• 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 feature keys: hold, transfer, message, headset, mute,redial, speakerphone
• Volume control keys
• Illuminated mute/headset/hands-free speakerphone key

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 using MD5/MD5-sess
• OpenVPN, IEEE802.1X, L2TP VPN
• IPv6, LLDP/CDP/DHCP VLAN, ICE
• WPA2/WPA3
• Secure boot
• GARP (Generic Attribute Registration Protocol)