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 Products: SinoV-GSM400E is a four-way wireless voice cards, slot type is PCI-E socket, line PCI ... special-purpose drive chip, it make the card has super strong anti-interference. And support ...