A vox file extension is related to the G.711 voice audio format.
VOX file extension - G.711 voice audio
What is vox file? How to open vox files?
File type specification:
The vox file extension is associated with the G.711 voice audio format.
An ITU standard for speech codecs that provides toll quality audio at 64 Kbps using either A-Law or mu-Law PCM methods.
The G.711 format has been the standard for digitizing voice by the telephone companies starting in the 1960s. However, newer algorithms have lowered the bit rate considerably, and respectable quality can be obtained at 16 Kbps and well below that, depending on the quality of all the components in the system.
This vox file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.