VoIP Voice Gateways

 key Features

l  Support two models: Bridge and Router(NAT&NAPT)

l  Network Protocols: TCP/UDP/IP, ICMP, HTTP, DHCP Clientï¼ÂˆWAN Interfaceï¼Â‰, DHCP Serverï¼ÂˆLAN Interfaceï¼Â‰, DNS Client, DNS Relay, SNTP, PPPoE, FTP, TFTP

l  VoIP Protocols: SIP (RFC2976,RFC3261, RFC3262, RFC3264, RFC3265,RFC3515,RFC3581)

l  Voice Codecs: G.711ï¼ÂˆA-law/U-law, G.729A/B, G.726

l  Redundancy SIP server (or Gate Keeper): Can auto swap address between two servers address

l  NAT transversal: Support STUN client. Can modify SIP register port, HTTP server port, Telnet server port and RTP port

l  Support two SIP server synchronously: Can register two different SIP server, and can make a call by either proxy

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

l  Support standard encryption and authentication (DIGEST using MD5, MD5-sess)

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

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

l  Support firmware upgrade via TFTP/FTP and HTTP