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

Network Features
WAN/LAN: Support Bridge Mode
Support Full Duplex Handfree
Support PPPoE for xDSL
Support DHCP Client on WAN
QoS with DiffServ
Support main DNS and secondary DNS server; Support SNTP Client, Firewall
Network tools in telnet server: Including ping, route, telnet client

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