... built-in Quad band 1 channel VOIP GSM gateway GOIP 1 channel VOIP GSM gateway Product Overview ... and an additional device Quad band GSM module: support GSM 850MHz, 900 MHz, 1800 MHz, 1900MHz Speech quality ensured by ... , G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web-base Management PPP over ... DSP: VPDSP101 95MHz Memory: RAM 8MB/ Flash 4MB GSM Module: Type: 850MHz, 900MHz, 1800MHz, 1900MHz Power: ...