• Support SIP 2.0 (RFC3261) and correlative RFCs

• Supprt IAX2

• Codec:G.711A/u, G.7231 high/low, G.729, G.722

• 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 5 sip server. Can connect  5 SIP server at the same time

• DTMF:Support SIP info, DTMF Relay, RFC2833

• SIP application: support Call forward/transfer/holding/waiting

• Call control features: Flexible dial map, Hotline, Empty calling reject, Black list for reject authenticated call, limit call, No disturb, Caller ID.

• Support three way conference call

• Support voice record, 240 seconds max or 3 record max, user-defined record prompt with 1 minute max

• Support Phonebook 500 records

• Incoming calls / Outgoing calls / Missing calls. Each support 100 records.

• Support conference and voice record on SIP server

• 8 kind of ring type

• English, Spanish, Czechoslovak alternative

Network Features

• WAN/LAN: Support Bridge and Router model

• Support basic NAT and NAPT

• Support PPPoE for xDSL

• Support DHCP Client on WAN

• Support DHCP Server on LAN

• Support VLAN (optional: voice vlan/data vlan)

• QoS with DiffServ

• Support DMZ

• Support VPN (L2TP/UDP TUNNEL)

• Support DNS Relay, SNTP Client, Firewall

• Network tools in telnet server: Including ping, trace route, telnet client

Maintenance and Management

• Web ,telnet and keypad management

• Management with different account right

• Upgrade firmware through POST mode

• Upgrade firmware through HTTP, FTP or TFTP.

• Telnet remote management./ Upload/download setting file

• Safe mode provide reliability

• Supoort Auto Provisioning (upgrade firmware or configuration file)

• Support Syslog