Voice Features:

* Support SIP RFC3261
* Codec: G.711A/u, G.7231 high/low, G.729
* Echo cancellation: Support G.168, and Hands-free can
support 96ms.
* Support Voice Gain Setting, Jitter Buffer, VAD, CNG, dual
GK, call forward, and Peer to Peer.
* NAT transverse: support STUN client, Citron, AVS.
* SIP support SIP domain, SIP authentication (none, basic,
MD5), DNS name of server, Peer to Peer.
* SIP support Pubic & Private server. Can connect to public SIP
and Private SIP server at the same time.
* SIP support dual public server.
* DTMF: Support SIP info, DTMF Relay, RFC2833.
* SIP application: support Call forward/transfer/holding/waiting.
* Call control features: Flexible dial map, support Hotline.
Empty calling No. Reject service, Black list for reject
authenticated call, No disturb, Caller ID.
* Support conference call and voice record.
* 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 DNS Relay, SNTP Client, Firewall
* Network tools in telnet server: Including ping, trace route,
telnet client.

Maintenance and Management

* Support Boot Monitor.
* Can upgrade firmware through boot monitor.
* Can config through Web, keypad, Telnet.
* Can upgrade firmware and configuration file through HTTP,
FTP, TFTP .
* Support Syslog.