1.4 Port Asterisk GSM Card 2.PCI 2.2 Slot 3. PSTN, Phone, CDMA, GSM Support 4.DTMF Detection 5.Factory ... 7 32 bit bus master DMA data exchanges across PCI interface at 132Mbytes/sec for minimum host processor ... the special-purpose drive chip, it make the card has super strong anti-interference. And support clock ... , Interface: PCI 2.2 2, CPU 800+MHZ 3, RAM 128+MB 4, Linux kernel 2.4.x or 2.6 ...