Audio Features

HD voice: HD handset, HD speaker
Hearing aid compatible (HAC) handset
Acoustic Shield
Audio codec: Opus, G.722, PCMA, PCMU, G.729A/B, 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
Call hold
One-touch speed dial
Hotline
Call forward, call waiting, call transfer
Mute, DND
Group listening, SMS
Emergency call
Redial, call return,
Auto answer
3-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/ac - Transmission rate: Up to 433Mbps (dynamic) - Frequency range: 2.4GHz/5.0GHz
Built-in Bluetooth for: - Bluetooth headset, - Mobile contacts synchronization - Bluetooth call
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)

Content Sharing (via Yealink VCD)
Enhanced DSS key

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

Management

Configuration: browser/phone/auto-provision
Auto provision via FTP/TFTP/HTTP/HTTPS for mass deploy
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

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/PPPoE
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 (TLS1.2)
HTTPS certificate manager
AES encryption for configuration file
Digest authentication using MD5/MD5-sess
OpenVPN, IEEE802.1X
IPv6, LLDP/CDP/DHCP VLAN, ICE

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