... transfer 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data transfe ... data centerDesign with standard TCP/IP protocol stackSupport APN/VPDNProduct Specification Cellular SpecificationItemContentCellular ModuleIndustrial cellular moduleStandard and BandEGSM900/GSM1800MHz, GSM850/900 ...