Converting C11 to WAV format

[rsv23]

Hi Guys,

Our customer wants to change IVR from embedded to VMpro, is there any tools to convert C11 to Wav?

Thanks,
RSV

 

[intrigrant]

Yes but not outside Avaya.

 

[AACon]

There is a way, but it's taboo. You're better off just re-recording it anyhow.

-Austin
I used to be an ACE. Now I'm just an Arse.

 

[Okkie26]

I thought that there was another question two months back, were someone mentioned it could be done in Audacity.

But I can't recall how.

 

[daken]

ffmpeg -f alaw -acodec pcm_alaw -ar 8000 -i input.c11 out.wav

Not tested it with a file pulled from system.
Only test it with a wave file converted to a c11
On first inspection it appears to work

 

[rsv23]

Thanks guys!

Is there any other way like using a converter?

 

[sizbut]

Not with any general purpose audio tools, Avaya would have to provide something and they don't.

The C11 file isn't just an audio format, its an audio file (pedantic troll following who misses the point) with an additional header that contains information about the call or prompt (eg. mailbox owner, caller ID, prompt type, etc). So you actually need a tool that will remove that extra header info so that the file is recognised by other applications are being an ordinary wav.

...and of course you need to read all that header info before conversion, otherwise you'll end up with a pile of converted files but no indication of which file belongs to which mailbox user, etc.

Stuck in a never ending cycle of file copying.

 

[intrigrant]

It is MOT a wav file but a G711 compressed raw audio format with a additionaol header.
I have been trying to decode the haeder but at certain point i gave up as i "found" a Avaya tool to convert the files
I have added a file with a explanation of the header

 

[BTSparksy]

You can use Audacity to import the RAW data from the C11 file (you might needto try this a few times with different dettings) and then export as a WAV.
I've tried it and it work quite well (after a bit of trial and error).

 

[Lam Nguyen]

Using Audacity, I am able to import and play .c11 or .cpl file but the audio has distortion even I tried to remove the header of the file. Anyone got the same issue?