Прослушивание линии через модем

в пакете "mgetty-voice" есть прога "vm"

[dima]$ vm

vm experimental test release 0.9.32 / 24Dec01

usage:
        vm beep   [options] [<frequency> [<length in 0.001sec>]]
        vm diagnostics <device name (e.g. ttyS2)>
        vm dial   [options] <phone number>
        vm help
        vm play   [options] <file names>
        vm record [options] <file name>
        vm shell  [options] [<shell script> [shell options]]
        vm wait   [options] [<time in seconds>]
        vm devicetest

options:
        -c <n> use compression type <n> (default is 0)
        -h     this help message
        -d <n> set i/o device to
               <n>= 1: No Device
               <n>= 2: Dialup Line
               <n>= 3: Ext. Microphone
               <n>= 4: Int. Microphone
               <n>= 5: Ext. Speaker
               <n>= 6: Int. Speaker
               <n>= 7: Local Handset
               <n>= 8: Dialup Line and Ext. Speaker
               <n>= 9: Dialup Line and Int. Speaker
               <n>=10: Dialup Line and Local Handset
               <n>=11: Dialup Line, Ext. Mic. and Ext. Speaker
               <n>=12: Dialup Line, Int. Mic. and Int. Speaker
        -t, -m, -i, -e, -s, -H     equals to -d <2,3,4,5,6,7>
        -l <s> set device string (e.g. -l ttyS2:ttyC0)
        -v     verbose output
        -w     use off / on hook signal from local handset
               to start and stop recording
        -x <n> set debug level
        -L <n> set maximum recording length in sec
        -P     print first DTMF tone on stdout and exit
        -R     read and print DTMF string on stdout and exit
        -S <s> set default shell for shell scripts (e.g. -S /bin/sh)
        -T <n> set silence timeout in 0.1sec
        -V <n> set silence threshold to <n> (0-100%)