3G2 to VMS Converter

Get VMS audio out of 3G2 videos quickly online

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Soundtrack Capture

Grab the audio layer from 3G2 recordings and store it as VMS. Perfect for isolating music, dialogue, or ambient sound from video footage.

No Installation

The converter runs entirely in your web browser. No plugins, no apps, no downloads — just open convertio.tools and start converting immediately.

Private and Secure

Your uploads are processed on encrypted servers and deleted right after conversion. Output files are purged within 24 hours for complete privacy.

How to convert 3G2 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

3G2 (3GPP2 file format) is a multimedia container developed by the 3rd Generation Partnership Project 2 for use on CDMA2000 mobile networks. Built on the ISO base media file format (MPEG-4 Part 12), it stores video encoded with H.263 or MPEG-4 Visual alongside audio in AMR, EVRC, or AAC codecs. The specification was first published in December 2003 to provide a standardized way for CDMA-based phones and networks to handle multimedia messaging and video playback. 3G2 files are engineered for extremely low-bandwidth conditions, achieving playable video quality at bit rates as low as 30-60 kbps. This makes the format especially efficient for mobile video capture on devices with limited processing power and storage. The container supports multiple tracks, timed text for subtitles, and embedded metadata. One significant benefit is near-universal compatibility with CDMA handsets from the mid-2000s era, ensuring reliable playback across a wide range of mobile devices. Though newer formats like MP4 have superseded 3G2 for most purposes, it remains useful for working with legacy mobile content and for situations where minimal file size is the primary concern.
Initial release: December 2003
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 3G2 to VMS?

VMS serves a specific niche in audio workflows. Converting 3G2 to VMS lets you use the content in specialized tools and platforms requiring this format.

What apps support VMS playback?

Open VMS using SoX and telephony systems that use VMS voice compression.

Will the entire audio track be extracted?

All audio from the 3G2 source is captured in the VMS output. The conversion preserves the full duration of the original soundtrack.

Do I need to install anything?

The converter is completely web-based. No software, no plugins — just open convertio.tools in any modern browser and convert 3G2 to VMS directly.

Can I convert 3G2 to VMS on my phone?

The tool works on smartphones and tablets. Open convertio.tools in your mobile browser, upload the 3G2, choose VMS, and download when done.

Can I batch convert multiple 3G2 files?

Yes — upload several 3G2 files at once and convert them all to VMS in a single session. Each file processes in parallel on our cloud infrastructure.