4,8,12,16 FXS/FXO ports PCI/PCI-E card Asterisk, FreeSwitch, Elastix Detecttion of ... for Freeswitch and Asterisksupport 4 to 16 FXS/FXO ports Applications: 1, PBX/IVR Services2, VoIP Services3, VoIP Gateways4, FAX Server, FAX On Demand5 ... , Call Centers7, Prepaid Calling Card System8, Callback Service9, Traditional Calls/VoIP Calls Conference Hardware and software requirements: 1, Interface: PCI 2 ...