MPG to VOX Converter

Extract Dialogic VOX audio from MPG videos online

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IVR Standard

VOX is the Dialogic telephony standard. Extract MPG audio as IVR-ready voice prompts your telephony system plays natively.

Compact Output

Dialogic ADPCM at 4:1 compression creates small files that decode instantly — ideal for real-time telephony playback.

Server Processing

Extraction runs on our servers — no Dialogic tools needed on your machine.

How to convert MPG to VOX

1

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

2

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

3

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

About formats

MPG is a common file extension for video files encoded using the MPEG-1 or MPEG-2 compression standards, developed by the Moving Picture Experts Group. The three-character extension originated from early Windows and DOS file systems that restricted extensions to three characters, providing a shorthand for the longer MPEG designation. MPG files contain MPEG program streams that multiplex one video and one or more audio elementary streams into a unified byte stream with synchronization timestamps. The format was widely used throughout the 1990s and 2000s for storing digital video on personal computers, appearing in everything from Video CD rips and DVD extractions to digital TV recordings captured with hardware encoder cards. MPG files using MPEG-1 compression typically contain 352x240 (NTSC) or 352x288 (PAL) video at bit rates around 1.5 Mbps, while MPEG-2 encoded MPG files support higher resolutions up to full HD. The program stream structure assumes a relatively reliable storage medium, unlike the transport stream variant designed for broadcast, making it efficient for file-based playback without the overhead of error recovery packets. Broad compatibility is one of the enduring strengths of the format, as virtually every media player across all operating systems can decode these files without additional codec installation. MPG continues to be encountered in archived video content, surveillance recordings, and legacy digital video workflows.
Initial release: August 1993
VOX is a headerless audio format built around Dialogic ADPCM encoding, widely adopted in telephony, interactive voice response (IVR) systems, and voice mail platforms since the 1980s. Each audio sample is compressed into 4 bits using an algorithm developed by Oki Electric and implemented in hardware on Dialogic Corporation's telephony interface cards. VOX files typically use a sampling rate of 6000 or 8000 Hz, producing extremely compact recordings optimized for speech intelligibility rather than musical fidelity. Because the format carries no header, playback software must know the sample rate and encoding parameters in advance — a trade-off that reduces overhead but demands careful file management. The primary advantage of VOX is storage efficiency: a one-minute voice recording at 8 kHz occupies roughly 240 KB, making it practical for systems storing thousands of prompts. Dialogic ADPCM conforms to the ITU-T G.726 standard, ensuring interoperability across telephony equipment from different vendors. Even as modern call centers migrate to IP-based systems with codecs like Opus, vast libraries of VOX recordings persist in legacy IVR deployments and compliance archives worldwide.
Initial release: 1983

Frequently Asked Questions

Why convert MPG to VOX?

VOX uses Dialogic ADPCM encoding — the industry standard for IVR telephony systems. Converting produces voice prompts these systems play natively.

What systems use VOX?

Dialogic telephony boards, IVR systems, auto-attendants, and professional call center platforms use VOX for voice prompts and messages.

Is VOX compressed?

Yes — Dialogic ADPCM compresses speech at 4:1 ratio, producing compact files that decode quickly on telephony hardware.

What sample rate should I use?

Most telephony systems use 6 kHz or 8 kHz. Check your platform requirements before setting the output sample rate.

Can I batch convert?

Upload multiple MPG files and extract VOX audio from each — build complete IVR prompt sets in one session.