Network and Protocol
IAX2
TCP(RFC793)
IP(RFC791)
UDP(RFC768)
ICMP(RFC792)
ARP(RFC826)
SNTP(RFC2030)
DHCP(RFC2131)
TFTP (RFC1350)
DNS(RFC1034,RFC1035)
SIP RFC3261, RFC3262, RFC3666, RFC2543
IP (RFC0791), TCP (RFC0793), UDP (RFC0768), ARP (RFC0826)
ICMP, ARP, RARP, SNTP
SDP TFTP DNS
Pubic Server/ Private server: can connect to ISP and Private SIP server at same time
Authentication: none, HTTP 1.1 basic/digest authentication for Web setup, MD5 (RFC2069/ RFC 2617)
NAT traversal: STUN, NAT ALG, NAPT, SIP Express router

Hardware Spec
WAN/LAN RJ-45 auto-sensing 10/100Mbps.
DHCP client (RFC2131) / TFTP client / PPPoE client
Static IP / DHCP / PPPoE
DNS client with 2 servers IP

Audio Codec
G.711 µ / A
G.723.1
G.729 A/B
G.722

QoS
ToS Diffserv, 802.1p/q
VAD, CNG, Packet Loss Compensation, adaptive Jitter Buffer; Echo cancellation G.168

Dial Tone Signal Generation
DTMF (out of Band RFC 2833 / in band)
SIP Info interoperate with CISCO SIP device

Phone features
9 Kinds of ringer able select by number of Phone Box.
Flexible Dial Map: Fix length; End with #; Dial Map Table; Dial with time out
Redial / Hold
Do Not Disturb
Block call (by number)
Call transfer
Forward (Off, Always, busy, No answer)

Configuration Support
Web, Telnet, TFTP
Password protection for configuration

Firmware Upgrade
TFTP; FTP, HTTP
Security firmware upgrade, firmware digest check

Log
Log level
Telnet logs and CDR
SysLog Logs and CDR
FTP/TFTP CDR upload

Physical & Environmental
Desktop / Wall mounting
POE(IEEE802.3af)
Dimensions: 205 x 75 x 65 mm
Weight: 350 g (main unit)
Operating Temperature: 0°to +40°C (32°to +104°F)
Storage Temperature:-20°to +70°C (-40°to +158°F)
Humidity: 5% -95% non-condensing