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Key features:
Support two sip servers running at the same time.
Redundancy sip server support.
Support T.38 fax function
Support IAX2 protocol
NAT, Firewall.
DHCP client and server.
Support PPPoE, (used for ADSL, cable modem connecting).
Support major G7.xxx CODEC.
VAD,CNG.
G.165 compliant 32ms echo cancellation
E.164 dial plan and customized dial rules
Support Lifeline.
Hotline.
Call Forward, Call Transfer, 3-way conference calls
Call ID display
DND(Do Not Disturb),Black List,Limit List
Reverse polarity
Voice prompt
Increase Vlan and automatically upgrade configuration file encryption function
support IAX2 and FAX
Increase the time zone function

Data Features
Static/Dynamic WAN IP Addressing
PPPoE

Management
Web, telnet and keypad management.
Adjustable user password and super password
Upgrade firmware through HTTP, FTP or TFTP.
Telnet remote management.
Upload/download setting file
Auto-provision.
Safe mode provide reliability

Interface
Two RJ45 ports, one for WAN, one LAN.
One RJ11 port, acts as lifeline function through lifeline accessory.
Power port

Data networking:
MAC Address
TCP:Transmission Control Protocol
DHCP:Dynamic Host Configuration Protocol
PPPoE：PPP Protocol over Ethernet
SNTP, Simple Network Time Protocol
STUN - Simple Traversal of User Datagram ...
MD5 Message-Digest Algorithm
DNS：Domain Name Server
RTP: Real-time Transport Protocol
RTCP:Real-time Control Protocol
Telnet:Internet's remote login protocol
HTTP:Hyper Text Transfer protocol
FTP:File Transfer protocol
TFTP:Trivial File Transfer Protocol

Call control /voip Features
SIP RFC3261,RFC 2543
Tone generation and Local DTMF re-generation according with ITU-T
G.711(A-law or u-law)
G729
AGC(Auto Gain Control)
G.168/165 compliant 16ms echo cancellation
AEC(Auto Echo Cancellation)
VAD (Voice Activity Detection)
CNG(Comfort Noise Generation

Enviromental

Electric requirements
Voltage: 9V ~ 24V
Power adapter: output DC 12V/450 mA

Operating requirement
Operation temperature: 0 to 40° C ( 32° to 104°F)
Storage temperature: -30° to 65° C (-22° to 149°F)
Humidity: 10 to 90% no dew

Regulatory compliance
CE,FCC part 15