... channel status 4, FSK DTMF 8-channel Voice LoggerAdopts parallel connection, allowing recording of analog telephone, all kinds of audio, ... swap, PNP(plug and play)and automatic recognition2, Parallel connection and high-impedance recording module, have no influence on ... PCM, ADPCM, GSM and so on8, Configuring various functional modules in different ways results in high-impedance recording, automatic ...