Codec: G.711A/u, G.729AB, G.726-32
DTMF: In-band, RFC 2833 and SIP INFO
Voice Activity Detection (VAD)
Comfort Noise Generation (CNG)
Background noise suppression
Adaptive jitter buffers
Packet loss concealment
Different country tones

Call forwarding (busy/ no answer/ always)
Call transfer ( unattended/ attended)
Call holding
Call waiting
3 way call conference
MWI
Flexible dial plan
Barring function for outgoing calls
Caller ID(FSK/DTMF)
Indication when N/A line available
Dial via VoIP or PSTN as default selection
Dial via PSTN when VoIP unavailable
CLIR(rejects anonymous calls)
CLIP(to make an anonymous call)
Dial without registration
Hotline/Warm-line
Black List/ White List

WAN / LAN：10/100M Ethernet ports,
Bridge mode and route
PPPoE for xDSL
VLAN（802.1Q/P）
NAT (NAPT)
NAT transverse :Support STUN client
DHCP client on WAN/ DHCP server on LAN
Main DNS and secondary DNS server
DNS Relay
NTP Client
Firewall
Web management access restricted
VPN(L2TP/PTP)
ping, tracert, telnet

WEB management
Management with different account right
Recover firmware and factory reset through Uboot
Upgrade firmware via HTTP,HTTPS, FTP, TFTP
DHCP option66 and custom option for auto provisioning
Auto Provisioning to upgrade configuration file
Syslog

Adapter Input: AC 100-240V
Adapter Output: DC 12V/0.5A
WAN Port -10/100 BASE-T RJ-45 for LAN
LAN Port-10/100 BASE-T RJ-45 for PC
FXS:2x RJ11
Power consumption: IDLE: 2.5W Active: 2.8W
Operation Temperature: 0〜40℃
Relative Humidity: 10〜65％
SDRAM: 64MB
FLASH: 16MB