... and DTMF single 2)free calling recorder system 3)support windows 2000,XP,vista 4) usb phone recorder box 2 ... by SKYLINE Co.,LTD,with FSK and DTMF.And the recorder support compressed format,just ... record automatically and manage.2 TYH-8201 can automatically compatible FSK and DTMF signal, and show the ... hours all recording just need less hardware, and have senior management functions, anytime retrieval, ...