... .0&H.323 protocal Support IMEI change Support VPN PPTP Quad band SMS server one channel GSM VOIP gatewayProduct Overview The 1 ... /100 Ethernet ports for the LAN and an additional device Quad band GSM module: support GSM 850MHz, 900 MHz, 1800 MHz, 1900MHz ... ), G.729A/B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Web-base Management PPP over Ethernet (PPPoE ...