4,8,12,16 FXS/FXO ports PCI/PCI-E card Asterisk, FreeSwitch ... card for Freeswitch and Asterisksupport 4 to 16 FXS/FXO ports Applications: 1, PBX/IVR Services2, VoIP Services3, VoIP Gateways4, FAX Server, ... VoIP Calls Conference Hardware and software requirements: 1, Interface: PCI 2.22, CPU 800+MHZ3, RAM 128+MB4, Linux kernel 2.4.x or 2 ... condensing4, Voltage: 5V/12V5, Power Dissipation Mas: 2.65w/10.8w