1.4 Port Asterisk GSM Card 2.PCI 2.2 Slot 3. PSTN, Phone, CDMA, GSM Support 4.DTMF Detection 5.Factory Price SinoV-GSM400 4GSM GOIP asterisk card/asterisk voip gatewayProduct Description ... automatically. Applications: 1, GSM (CDMA)- VoIP gateway 2, Mobile IP-PBX 3, GSM (CDMA) Call back 4 GSM (CDMA) wireless bypasses system 5 GSM (CDMA) wireless call ...