Full port VoIP gateway ,2 RJ45 ports for WAN ,one RJ11 port for LAN .

1. Support two models ,bridge and Router ( NAT & NAPT ) ,
2. Network Protocols , TCP/UDP/IP,ICMP,HTTP,DHCP Client ( WAN Interface ) , DHCP Server ( LAN Interface ) ,DNS Client ,DNS Relay ,SNTP ,PPPoE ,FTP ,TFTP ,
3.VoIP Protocols ,SIP ( RFC 3261 ,RFC2543),
4.Voice Codes ,G.711A-law ,G.729 A/B ,G.726-32k ,
5.Redundancy SIP server , can auto swap address between two servers address ,
6. NAT transversal , Support STUN client .Can modify SIP register port ,HTTP server port ,Telnet server port and RTP port ,
7. Support two SIP server synchronously,Can register two different SIP servers ,and can make a call by either proxy ,

8.Support standard voice features such as numeric Caller ID Display ,Call Waiting ,Hold ,Transfer ,Do-Not-Distturb ,Call Forward ,in-band and out-of-band DTMF,Hotline( off hook autodial ),ban outgoing ,

9. Support Silence Suppression,VAD ( Voice Activity Detection ),CNG ( Comfort Noise Generation),Line Echo Cancellation ( G.168 ) ,and AGC ( Automatic Gain Control ) ,

10. Provide easy configuration thru manual operation ( Web interface ) or automated centralized configuration file via TFTP or HTTP .

11 .Support firmware upgrade via TFTP/FTP and HTTP .