Network Gateway with SIP Support

Product Description

* Support SIP * Support Bridge and Router (NAT&NAPT) models. * TCP/UDP/IP, ICMP, HTTP, DHCP Client (WAN Interface), DHCP Server(LAN Interface), DNS Client, DNS Relay, SNTP, PPPoE, FTP, TFTP. * Voice Codes: G.711(A-law/U-law), G.723.1, G.729A/B * NAT penetration: STUN client, AVS and Citron etc. Can modify SIP register port, HTTP server port, Telnet server port and RTP port. * Support standard voice features such as numeric Caller ID Display, Call Waiting, Hold, Transfer, Do-Not-disturb, Forward, in-band and out-of-band DTMF, Hotline (off hook autodial), ban outgoing. * Support standard encryption and authentication (DIGEST using MD5, MD5- sess). * Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control). * Provide easy configuration thru manual operation (Web interface and Telnet) or automated centralized configuration file via TFTP or HTTP. * Support firmware upgrade via TFTP/FTP and HTTP. * Support syslog, can send event of gateway to syslog server. * Each FXS port can have one SIP account.It can be use the same SIP account for 4 FXS ports,but at that time,only one of the port can be used as callee,however,all port can be used as caller simultaneously. * But when they used the different SIP account,it can be used as caller or callee anytime.