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

12 VoIP accounts
Call hold, mute, DND, redial, call return, auto answer
One-touch speed dial, call forward, call waiting, call transfer
Group listening, hotline, SMS, emergency call
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 4.2 for: - Bluetooth headsets - Contact synchronization - Bluetooth call
USB port (2.0 compliant) for: - Wired/wireless USB headset - USB call recording through USB flash drive - Expansion module EXP50 (up to 3)
Content Sharing (via Yealink VCD)(1)
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
OpenVPN, IEEE802.1X
IPv6
LLDP/CDP/DHCP VLAN
ICE

Feature keys

8 line keys with LED
8 line keys can be programmed up to 21 various features (3-page view)
5 features keys: mute, headset, message, redial, hands-free speakerphone
4 context-sensitive “soft” keys
6 navigation keys
Volume control keys
Illuminated mute/headset/hands-free speakerphone key