- Extension
- .gsm
- .vms
- Format
- Binary
- Binary
- Category
- Audio
- Audio
- Developer
- European Telecommunications Standards Institute (ETSI)
- VoidMail
- Description
- A lossy file format used to compress speech in Global Standard for Mobile (GSM) telecommunications. It is very effective for reducing audio file size. However, encoding and decoding audio signals severally is discouraged as the final product will have a lot of noise. Popular with some voice mail software but it is CPU intensive.
- Used in Germany to compress speech audio for voice mail. A self-describing variant of cvsd (Continuously Variable Slope Delta modulation).
- MIME Type
- audio/x-gsm
- audio/x-vms-compressed-void-mail
