Basic Features
Support SIP 2.0 (RFC3261) and correlative RFCs
Support 2 sip line
Codec:G.711A/u, G.7231 high/low, G.729a/b, G.722,
Echo cancellation: G.168 Compliance in LEC, additional acoustic echo cancellation(AEC) can reach 96ms max filter length in hands-free mode
Support Voice Gain Setting, VAD, CNG
Full duplex hands-free speakerphone
DTMF MODE:DTMF_RELAY, SIP_INFO, RFC_2833
NAT transverse:support STUN client

Application Features
SIP application:support Call forward/transfer/holding/waiting/3 way call/call park/join call/click to dial
SIP support SIP domain, SIP authentication (none, basic, MD5), Peer to Peer call
Call control features: flexible dial map, hotline, empty calling no. reject service, black list for reject authenticated call, white list, limit call, no disturb, caller ID,
Incoming calls /outgoing calls / missing calls. Each support 100 records
Support Phonebook 500 records
10 kind of ring type
Support Conference
Support Mute
Support MWI

Network Features
WAN/LAN: supports Bridge
Support PPPoE for xDSL
Support DHCP client on WAN
Support SNTP Client, Firewall
Support main DNS and seconary DNS server
Support VLAN
QoS with DiffServ
Network tools in telnet server: including ping, trace route, telnet client

Maintenance and Management
Web ,telnet and keypad management
Management with different account rights
Upgrade firmware  through POST mode
Safe mode provide reliability
Support Auto Provisioning (upgrade firmware through HTTP, FTP or TFTP)
Support Syslog