There are many free voice file conversion programs on the Internet. I would suggest first trying to convert your "IVR" file to MP3 or WAV, and then try converting that to MP4. Your program may not be able to convert directly from the IVR format to MP4.
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互联网上有许多免费的语音文件转换程序。我建议首先尝试将“IVR”文件转换为 MP3 或 WAV，然后尝试将其转换为 MP4。您的程序可能无法直接从 IVR 格式转换为 MP4。
There are many free voice file conversion programs on the Internet. I would suggest first trying to convert your "IVR" file to MP3 or WAV, and then try converting that to MP4. Your program may not be able to convert directly from the IVR format to MP4.