If you have old ".vox" files that need to be converted for a new application, then the first step could be to use a sound editor to read the file in, so that you can try to determine the codec that was used to encode the sound samples.
VOX FILE PLAYER SOFTWARE
VOX files can be played using the Dialogic ® Global Call / R4 family of APIs or by the Dialogic ® Diva ® Software Development Kit (SDK), but in both cases the application needs to specify the format and sample rate in order for playback on the line to be correct. An application cannot guess exactly what codec was used to record the samples, because that information is not stored in a file header, as it would be for a. People get confused about this and often ask "how to I play/convert a prompt in VOX format?", but in fact VOX is not really a format, but simply a dump of sound samples that has been given a ".vox" extension. VOX files have been long associated with the Dialogic ® DMV and JCT Media Boards, and customers often have collections of recorded prompts stored in "VOX format". distorted, wrong speed/pitch, or just ‘noise’), then you are not playing it back in the same way that it was recorded. There is no file header inside a VOX file, only audio samples, so there is no way to know which format a particular file contains.
Consequently, VOX files are often 8kHz (although 6kHz is also possible). Because voice networks have relatively low bandwidth the audio used can be sampled at a fairly low rate (an ISDN "B" channel carries only 8kHz voice). Usually they contain pre-recorded voice prompts. VOX files are audio files used in speech applications.