Basic Features
n Support SIP 2.0 ( RFC3261) and correlative RFCs
n Support IAX2
n Support 3 SIP lines. Can connect to 3 SIP servers at the same time.
n Codec: G.711A/ u, G.723.1 high/ low, G.729a/ b, G.722, G.726
n Echo cancellation: G.168 Compliance in LEC, additional acoustic echo cancellation( AEC) can reach 96ms max filter length in hands-free mode
n Support Voice Gain Setting, VAD, CNG
n Full duplex hands-free speakerphone
n SIP support SIP domain, SIP authentication ( none, basic, MD5) , DNS name of server, Peer to Peer/ IP call
n DTMF: Support SIP info, DTMF Relay, RFC2833
n 9 kind of ring type and 5 user-defined music ring ( optional)

Advanced Application Features
n Large dot matrix LCD display and softkeys make user easier to use
n Friendly graphic menu
n 2 headset interface ( 3.5mm Jack or RJ9 connector)
n 6 memory keys
n Multilanguage realizes localization
n SIP application: support call forward/ transfer ( blind/ attended) / holding/ waiting/ 3 way talking/ conference/ pickup/ join call/ redial and unredial/ click to dial/ vport/
n 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, CLIR ( reject the anonymous call) , CLIP ( make a call with anonymous) , Dial without register
n Incoming calls / outgoing calls / missing calls. Each support 100 records.
n Support Phonebook 500 records
n Support SMS
n Support Memo
n Support alarm clock
n Support Speed dial
n Support XML

Network Features
n WAN/ LAN: 10/ 100M Ethernet ports, supports Route and Bridge mode.
n Support PPPoE for xDSL
n Support PoE
n Support basic NAT and NAPT
n NAT transverse: support STUN client
n Support DHCP client on WAN
n Support DHCP server on LAN
n Support main DNS and secondary DNS server.
n Support VLAN
n Support DMZ
n Support DNS Relay, SNTP Client, Firewall
n Support VPN ( L2TP)
n QoS with DiffServ
n Network tools in telnet server: including ping, trace route, telnet client

Maintenance and Management
n Web , telnet and keypad management
n Management with different account right
n Upgrade firmware through HTTP, FTP or TFTP
n Telnet remote management/ upload/ download setting file
n Safe mode provide reliability
n Support Auto Provisioning ( upgrade firmware or configuration file)
n Support Syslog