USB Telephone Recorder 1,high-impedance recording 2,Accurately ... 4,FSK, DTMF code 8-channel Telephone RecorderTelephone recorder adopts parallel connection, allowing recording of analog telephone, ... audio, radio and carrier phone. GXUSB-R telephone recorder records with clear tone quality, is easy to ... leading level. 7, Offers a large selection of audio encoding, including A-law PCM, ADPCM, GSM and so ...