Features
n Support SIP 2.0 ( RFC3261) and correlative RFCs
n Codec: G.711 A/ U Law, G.723.1, G.729a/ b, G.722, G.722.1, G.726
n Echo cancellation: Support G.168, and Hands-free can support 96ms, Hand free Speaker Phone
n Support Voice Gain Setting, VAD, CNG
n Full duplex hands-free speakerphone
n NAT transverse: support STUN client
n SIP support SIP domain, SIP authentication ( none, basic, MD5) , DNS name of server, Peer to Peer/ IP call
n SIP support 2 SIP lines. Can connect to SIP1 and SIP2 server at the same time
n DTMF: Support SIP info, DTMF Relay, RFC2833
n SIP application: support Call forward/ transfer/ holding/ waiting / 3 way talking
n Call control features: Flexible dial map, Hotline, Empty calling reject, Black list for reject authenticated call, limit call, No disturb, Caller ID
n Support Phonebook 500 records
n Incoming calls / Outgoing calls / Missing calls. Each support 100 records
n Support conference and voice record on SIP server
n Support 10 kind of ring type and 1 user ring
n Support IAX2
n Support MWI
n Support SMS
n Support Speed Dial
n Support Memo
n Multilanguage realizes localization

Network Features
n WAN/ LAN: Support Route and Bridge model
n Support basic NAT and NAPT
n Support PPPoE for xDSL
n Support DHCP Client on WAN
n Support DHCP Server on LAN
n Support VLAN ( optional: voice vlan/ data vlan)
n QoS with DiffServ
n Support DMZ
n Support VPN ( L2TP)
n Support main DNS and secondary DNS server
n Support DNS Relay, SNTP Client, Firewall
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 POST mode
n Upgrade firmware through HTTP, FTP or TFTP.
n Safe mode provide reliability
n Support Auto Provisioning ( upgrade firmware or config file)
n Support Syslog