I wasn't sure which category to put this in, but I guess it fits best in forensics.

I have a problem with an audio file, it's a .wav. Our phone system records phone calls "for quality assurance purposes" and are reviewed (or in some cases, investigated) often.

We have a situation where we need to listen to one of these calls and we've downloaded it from the system. It's apx. 2MB in size, but when we try to play it, there is no sound. There are no error messages, and the slider moves across like it is playing the file.

We've tried converting it to mp3, but the 'process' meter goes in a negative direction and never converts the file.

Does anyone know of a good tool that can analyze this file or somehow extract audio out of it?

Thanks.

Hey Brian, thanks for the reply.

I'm not sure of any special codecs or exactly clear on how the conversations are captured as it's built into the system. I'd have to check with our telecom guy. I do know that we don't normally have problems with listening to these files. And I'm pretty sure that the calls are not encrypted.

As this recovery and not forensics...
Open a copy of it in a text editor, go here:
http://www.sonicspot.com/guide/wavefiles.html

To help look for what data is incorrect missing in the header.

OR open a copy of it in a sound editor, copy dif' parts of it and paste into a new file to see if you can find good audio.

If that does not work then the corruption may be the whole file, BONK.