Screen：128x48 dot-matrix with backlight

 Networking

10/100Mbps Ethernet, dual bridged port for PC bypass

 IP Configuration: Static / DHCP / PPPoE

 Network Access Control: 802.1x

 VPN: L2TP (Basic Unencrypted) / OpenVPN

 VLAN

 QoS

 Protocols

 SIP2.0 over UDP/TCP/TLS

 RTP/RTCP/SRTP

 STUN

 DHCP

 PPPoE

 802.1x

 SNTP

 FTP/TFTP

 HTTP/HTTPS

 TR069

 RFCs

 354/1321/1350/1769/1889/1890/2131/2132/2616/

 2617/2661/2833/2976/3261/3262/3263/3264/3265

 /3268/3311/3489/3711/4346/4566/5630/5865

 Deployment & Maintenance

 Auto-Provisioning via

 FTP/TFTP/HTTP/HTTPS/DHCPOPT66/SIP PNP/TR069

 Web Management Portal

 Web-based Packet-dump

 Configuration Export / Import

 Phonebook Import/Export

 Firmware Upgrade

 Syslog

 Call Features

Answer / Reject Calls

Mute / Unmute (microphone)

Call Hold / Resume

Call Waiting

Intercom

Caller ID Display

Speed Dial

Anonymous Call (Hide Caller ID)

Call Forwarding (Always/Busy/No Answer)

Blind / Attended Call Transfer

Call Parking / Pick-up

Redial/Auto-Redial

Do-Not-Disturb (per line / per phone)

Auto-Answering (per line)

3-way Conference

Hot Line

Phone Features

2 SIP Lines

HD Voice

Handset / Hands-free / Headset mode

Phonebook (500 entries)

Remote Phonebook (XML/LDAP)

Call log (600 entries, in/out/missed)

Black/White List Call Filtering

Message Waiting Indication (MWI)

Programmable Soft keys

Network Time Synchronization

Action URL / Active URI

Industrial Standard Certifications: CE/FCC

Audio

HD Voice Microphone/Speaker

Wideband ADC/DAC 16KHz Sampling

Codecs: G.711a/u, G.723.1, G.726-32K, G.729AB, G.722

Full-duplex Acoustic Echo Canceller (AEC)

Voice Activity Detection (VAD)

Comfort Noise Generation (CNG)

Background Noise Estimation (BNE)

Noise Reduction (NR)

Packet Loss Concealment (PLC)

Dynamic Adaptive Jitter Buffer up to 300ms

DTMF: In-band, Out-of-Band – DTMF-Relay(RFC2833) / SIP INFO