... GSM Card 2.PCI 2.2 Slot 3. PSTN, Phone, CDMA, GSM Support 4.DTMF Detection 5.Factory Price SinoV-GSM400 ... the access of wireless (GSM ), PSTN, Phone. 2,Supports GSM, CDMA two kinds of wireless communication standard. 3,Support GSM: 850M ... each channel. GSM800 realize the integrate of Wireless(GSM or CDMA) and PSTN. 3, High security: It adopts tertiary thunder preventing ...