WAV to VOX Converter

Encode WAV as Dialogic ADPCM VOX audio online

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IVR Standard Format

VOX is the native audio format for Dialogic telephony — convert your WAV prompts for direct use in IVR and call center systems.

Full System Deployment

Convert an entire library of WAV voice prompts to VOX at once — deploy your complete phone system audio in one step.

No SDK Required

Create VOX files from WAV in your browser — no Dialogic SDK or telephony development tools needed.

How to convert WAV 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

WAV (Waveform Audio File Format) is an uncompressed audio container jointly developed by Microsoft and IBM, first published in August 1991 alongside Windows 3.1. Built on the Resource Interchange File Format (RIFF), WAV stores audio data — most commonly as linear pulse-code modulation (LPCM) — together with metadata describing sample rate, bit depth, and channel count. This straightforward structure has made WAV the de facto standard for uncompressed audio on Windows and a universally accepted interchange format across virtually every operating system, audio editor, and media player in existence. CD-quality WAV files use 16-bit samples at 44.1 kHz stereo, while professional workflows routinely employ 24-bit or 32-bit float samples at rates up to 192 kHz. A major advantage is zero-loss fidelity: because standard WAV applies no compression, the stored data is an exact digital representation of the original recording, making it the preferred choice for mastering and archiving. WAV also supports embedded metadata through INFO and BWF chunks, enabling timestamping and production notes. The main trade-off is file size — one minute of CD-quality stereo occupies roughly 10 MB — and the 32-bit RIFF structure imposes a 4 GB limit, though RF64 removes that ceiling.
Developer: Microsoft and IBM
Initial release: August 1991
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 WAV to VOX?

VOX is the native format for Dialogic telephony hardware. IVR and automated phone systems require VOX-encoded audio for prompts and greetings.

What systems use VOX?

Dialogic boards, many IVR platforms, and legacy telephony systems consume VOX files directly for voice prompts and menu audio.

How compact is VOX compared to WAV?

VOX uses 4-bit ADPCM at 8 kHz — a huge compression compared to 16-bit 44.1 kHz WAV. Files shrink by roughly 20 times.

Is VOX suitable for music?

No — 4-bit ADPCM at telephony sample rates is designed for speech intelligibility, not musical quality.

Can I prepare a full IVR prompt set?

Upload all your WAV prompts and convert them to VOX in one batch — ready for immediate deployment on your telephony platform.

WAV to VOX Quality Rating

4.6 (249 votes)
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