... Have encryption built-in Quad band 1 channel VOIP GSM gateway GOIP 1 channel VOIP GSM gateway Product Overview ... G.711 (A/µ law), G.729A/B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web ... : Type: 850MHz, 900MHz, 1800MHz, 1900MHz Power: Input AC100V ~ 240V, output 12 Vdc 500 mA Power consumption: 3W maximum Operating ... : 40% ~ 90% Not congealed Weight: 500 g (1 lb) (Including AC/DC Adapter) Warranty ...