---
name: "vm"
section: "1"
platform: "linux"
package: "mgetty-voice"
version: "1.2.1-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/vm"
---

# vm(1)

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

## NAME

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

## ACTIONS

- beep *options* **\[\<frequency** \[\<length in 0.001sec\>\]\]\>

  - diagnostics *options* **device name (e.g. ttyS2**

  - dial *options* **phone number**

  - help

  - play *options* **\[\<file names**\]+\>

  - record *options* **file name**

  - shell *options* **\[\<shell script** \[shell options\]\]\>

  - wait *options* **\[\<time in seconds**\]\>

  - devicetest

  ## OPTIONS

- **-c n** use compression type **n**

  - **-d n** set i/o device

  - **-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%%)

  ## SEE ALSO

**vgetty**(1)