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 
4 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

Screen：2.8 inch (320x240) LCD color-screen
HD Handset：RJ9
Network Interfaces：Network：10/100Mbps(802.3AF POE Class 1 Enabled)
                PC：10/100Mbps (Bridged to network)
HD Hands-free Speaker：0~7KHz
HD Hands-free Microphone：0~7KHz
RJ9 Phone port：Handset
         Headset
Keypad (39 keys)：8 DSS key with tri-color LED
                                4 Soft-keys
                                7 Function keys
                                4 Navigation keys + 1 OK key
                                12 Standard Phone Digits keys
                                2 Volume Control keys, Up/Down
                                1 Hands-free key
Power Input：DC 5V/0.6A
Power Consumption：Idle：1.3W
                                    Peak：4.3W
Working Temperature：0~40°C
Working Humidity：10~65%
Installation：Desktop
                      Wall-mount
Color：Black
Package Dimension：260x255x62mm (L x W x H)