Click to enlarge image Radius based CDR for accounting; Stun client for nat transversal; Flexible interface for analog phones, fax, traditional pbx with analog trunks. Main applications Remote sip access gateway for ip-pbx; IP based wide area pbx for enterprise, government branches and schools; VOIP long distance application for IP phone supermarkets and enterprises; Carrier primary and secondary line service; Small and home offices In conjunction with soft switch or ip-pbx servers, it can provide the following features: Fax and modem service Gy8 series supports fax tone detection and codec bypass (t.30), and fax relay (t.38) function. Supported protocols Codec: G.711, g.723.1, g.729a;g.168 echo cancellation; Session initiated protocol (sip) Media gateway control protocol (mgcp) Real time transport protocol(rtp) Tftp for remote software upgrade HTTP for system and interface configuration and monitoring Snmp v.1, v.2, v.3 Telnet for remote support Dhcp for dynamic IP address allocation Dtmf Stun client for nat/firewall traverse Caller ID Message waiting indication Call waiting Call forwarding Caller ID on call waiting Call transfer (on busy, no answer, all) Special purpose calling codes Speed dial Redials Gy8 multi-purpose VOIP gateway series Dtmf transportation: Transparent mode, rfc 2833 mode, sip/info mode; Fax: Transparent mode (t.30), fax relay mode (t.38). Other specifications: Power 5v/3a DC power supply (included with AC adaptors) Power dissipation 15 watts(max) Talk battery -24 v Ringing voltage 50v rms Loop current 21 ma Max line length 1500m or 415 ohm Ren equivalence 5 for short loop (1000 feet),3 for long loop (5000 feet) analog interface rj-11 Off-hook detection loop start Dialing dtmf Memory 32mb Flash 8mb Physical: Size(l * w * h) 195 * 118 * 34 mm Weight 650 gram Besides, we also have carrier-class access gateway series that offers FXS line of 16, 24, 48 sizes, FXO line of 8, 16, 24, 32 sizes, and FXS/FXO combination of 8/8, 12/12, 16/16, 24/4, 48/4 sizes, and trunk gateway which has 30, 60, 120, 240 digital trunk lines of 4 different models.