... FSK Adjustable line gain PCI/PCI-E analog card for Freeswitch and Asterisksupport 4 to 16 FXS/FXO ... , Voice Mail Services6, Call Centers7, Prepaid Calling Card System8, Callback Service9, Traditional Calls/VoIP Calls Conference ... .22, CPU 800+MHZ3, RAM 128+MB4, Linux kernel 2.4.x or 2.6.xSize and ... 140*104*12MM6, Weight: 152g The environmental instructions for using: 1, Temperature Operation: 0 to 80°C2 ...