USB Telephone Recorder 1,high-impedance recording 2,Accurately judge the channel status 3,Supports AGC 4,FSK, DTMF code 8-channel ... build a convenient-move telephone recording monitoring system.Features:1, USB interface, provides easy installation, supports hot-swap, PNP (plug ... end during call11, Supports automatic recovery after hot-swap and USB port error 12, Drivers is based on event-driven, ...