... Have encryption built-in Quad band 1 channel VOIP GSM gateway GOIP 1 channel VOIP GSM gateway Product Overview ... performance ARM 9 Processor Enhanced FeaturesLEDs for Power, Ready, Status, WAN, PC, GSM Call forward from GSM to VoIP ... G.711 (A/µ law), G.729A/B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web- ... Humidity: 40% ~ 90% Not congealed Weight: 500 g (1 lb) (Including AC/DC Adapter) Warranty ...