vm - VoiceModem is the program for handling the voice modem functionality from shell scripts

       beep options[<frequency [<length in 0.001sec>]]>
       diagnostics optionsdevicename(e.g.ttyS2
       dial optionsphonenumber
       help
       play options[<filenames]+>
       record optionsfilename
       shell options[<shellscript [shell options]]>
       wait  options[<timeinseconds]>
       devicetest

       vm - VoiceModem is the program for handling the voice modem functionality from shell scripts

-cn use compression type n-dn set i/o device
       -t,-m,-i,-e,-s,-H equals to -d <2,3,4,5,6,7>
       -ls 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
       -xn set debug level
       -Ln 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
       -Ss set default shell for shell scripts (e.g. -S /bin/sh)
       -Tn set silence timeout in 0.1sec
       -Vn set silence threshold to <n> (0-100%%)

vgetty(1)

perl v5.40.0                                       2024-11-18                                              VM(1)