Converting Unsupported Audio Files to WAV 

3CX allows you to import audio files in this format to use as the system prompts:

  • Format: WAV
  • Channel: Mono
  • Bit rate: 8 kHz
  • Sampling: 16 bit

You need to convert to this format any prompts for IVR, Queues and custom system prompt sets.

Convert to Wav with the 3CX Online Audio Converter

Automatically convert an audio file to the appropriate format with the 3CX Online Audio Converter:

  1. Drag-and-drop the audio file in the upload area or click on the box above to select and upload.
  2. After the conversion finishes, click on “Download” to save the converted audio file.

Click to upload or drag and drop Max file size: 50 MB | Max duration: 15 min | Max channels: 8 




Manually Convert an Audio File
To convert an audio file using the free Audacity audio editor:
  1. Download and install Audacity.
  2. Open Audacity, click on “File” > “Open” and select the file you want to convert.
  1. You can see and change the audio track properties via Audio Setup > Audio Settings.
  2. Change the “Project Rate (Hz)” on the bottom status bar to 8000, i.e. 8 kHz.
  1. If you are using a stereo file, click on the three dots in the track editor and select “Split Stereo to Mono”. Click on the “X” button in the audio track properties to remove the second track.
  2. Click on “File” > “Export Audio” and:
  1. enter a name for the file to export (file names must be in a latin character set),
  2. set “Save as type” to “WAV (Microsoft) signed 16-bit PCM”.
  1. Click on “Save”.
Upload Converted Audio Files to 3CX
To upload the exported file(s) via the 3CX Admin Console, go to:
  • “Digital Receptionist” - upload converted audio files in IVR menus.
  • “Call Queues” - upload converted audio files for intro prompts and on-hold music.
  • “Settings” > “System Prompts” - more info on How to Localize Audio Prompt Sets.
  • “Settings” > “Music on Hold”  - update the on-hold music or playlist.
See Also
Last Updated
This document was last reviewed on 04 June 2026
https://www.3cx.com/docs/converting-wav-file/