| Audio Features | - HD voice: HD handset, HD speaker
- Hearing aid compatible (HAC) handset
- Acoustic Shield
- Smart Noise Filtering
- Audio codec: G.722, PCMU(G.711µ), PCMA (G.711A), 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
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| 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 functions: audio optimization, redial, call hold, volume synchronization, multiple calls control
- Content Sharing (via Yealink VCD)
- Enhanced DSS key
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| 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
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| 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
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| 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
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| 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
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| 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
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| Interface | - Dual-port Gigabit Ethernet
- Power over Ethernet (IEEE 802.3af)
- 1 x USB port (2.0 compliant)
- 1 x RJ9 (4P4C) handset port
- 1 x RJ9 (4P4C) headset port
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| Management | - Configuration: browser/phone/auto-provision
- Auto-provision via FTP/TFTP/HTTP/HTTPS for mass deployment
- Auto-provision with PnP
- Broadsoft device management
- Zero-sp-touch, TR-069
- Phone lock for personal privacy protection
- Reset to factory, reboot
- Package tracing export, system log
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| 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)
- ARP, ICMP
- 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)
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| 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 current: 5V 500mA
- Power consumption (PSU): 3.2W-6.3W
- Power consumption (PoE): 4.0W-7.8W
- Dimension (W*D*H*T): 259.4mm*220mm*211mm*44.5mm
- Operating humidity: 10~95%
- Operating temperature: -10~50°C (+14~122°F)
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| Package Features | - Package content: Yealink SIP-T57W IP phone; Handset with handset cord; Ethernet Cable; Stand; Quick Start Guide; Power Adapter (Optional)
- Qty/CTN: 5 PCS
- N.W/CTN: 8.86 kg
- G.W/CTN: 9.79 kg
- Giftbox size: 324 mm*293 mm*128 mm
- Carton Meas: 680 mm* 303 mm*342 mm
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