OGG to VMS Converter

Encode OGG audio as VMS voice mail format

Drop files here. 1 GB maximum file size or Sign Up
to
Facebook Amazon Microsoft Tesla Nestle Walmart L'Oreal

Voice Mail Format

VMS is purpose-built for German telephony voice mail — produce compliant audio from OGG voice recordings.

Online Processing

No telephony infrastructure needed for conversion — encode OGG to VMS directly in your browser.

Private Handling

OGG uploads are removed after processing and VMS files are purged within 24 hours from our servers.

How to convert OGG to VMS

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose vms or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your vms file right afterwards

About formats

OGG Vorbis is an open, royalty-free lossy audio codec inside the Ogg container format, both developed by the Xiph.Org Foundation. Vorbis was designed as a patent-free alternative to MP3 and AAC, using modified discrete cosine transform (MDCT) coding with variable bitrate encoding that adapts to signal complexity per frame. Blind listening tests have consistently shown Vorbis delivering perceptual quality matching or exceeding MP3, especially in the 96-192 kbps range. The format supports sample rates from 8 kHz to 192 kHz and 1 to 255 channels, covering everything from mono voice to surround mixes. A standout advantage is the complete absence of licensing fees — game developers, streaming platforms, and hardware makers can implement Vorbis without royalty concerns. Spotify relied on Vorbis for years as its primary streaming codec for exactly this reason. The format also handles quality degradation at low bitrates more gracefully than many competitors, which is why it remains popular in video games where storage is tight and thousands of sound effects compete for space. VLC, Firefox, Chrome, and Android all provide native Vorbis decoding.
Initial release: May 1, 2000
VMS (Voice Messaging System) is a compressed audio format designed for telephony and voice mail applications, originally used in Germany. Files with the .vms extension encode spoken audio using Continuously Variable Slope Delta modulation (CVSD), a method suited to low-bandwidth voice transmission over telephone networks. The format operates at 8 kHz, matching the standard digital telephony sampling frequency, and produces self-describing files that embed encoding parameters within a short header. This header distinguishes VMS from raw CVSD streams, letting playback tools process recordings without external configuration. The SoX audio toolkit provides native read and write support, making it straightforward to convert VMS recordings into WAV or other modern formats. A practical advantage is the format's small file size — CVSD compression keeps voice mail messages compact enough for systems with limited disk capacity, which was critical in early telephony infrastructure. The encoding degrades gracefully under noisy channel conditions, preserving speech intelligibility even when errors occur. Although VMS has been superseded by modern codecs in current voice messaging platforms, it remains relevant for recovering legacy voice mail archives.
Developer: SoX Contributors
Initial release: 1991

Frequently Asked Questions

Why convert OGG to VMS?

VMS is a self-describing CVSD variant used in German voice mail systems. Telephony platforms in Germany require VMS-formatted audio files.

What uses VMS files?

German voice mail platforms, telephony integration tools, and SoX command-line utilities process VMS audio.

Is VMS the same as DVMS?

VMS and DVMS are closely related — both are self-describing CVSD variants used in German voice mail, with minor structural differences.

What quality does VMS provide?

VMS stores telephony-grade speech — designed for voice intelligibility at low bandwidth, not music or high-fidelity audio.

Can I convert multiple OGG files?

Upload a batch of OGG voice recordings and produce VMS output for each in one session.

OGG to VMS Quality Rating

5.0 (2 votes)
You need to convert and download at least 1 file to provide feedback!