CCX prompt audio format

[SteveK066]

When I use Audacity to record greetings for Unity Call Handlers, I can export them as WAV 16-bit. I can upload the file and it plays successfully. If I do the same for a CCX prompt, it does not play - just noise is heard. I've ended up downloading an existing prompt, such as 7333, renaming it to 7334, upload that and re-record the greeting with the Call Center Maintenance line, then delete and rename the prompts accordingly for the new one to be in effect.

I've tried different formats using Audacity to record prompts, I wonder what format I should be using for CCX?

[Jonathan Schulenberg · Accepted solution]

8000Hz, mono, WAV (Microsoft), U-Law

[SteveK066]

I saw that documented. Audacity can specify 8000Hz mono and when exporting U-Law, but If I record a new file and choose 8000 Hz and export it, the prompt plays extremely slow, as if a fraction of the original speed. I then downloaded an existing prompt, opened it with Audacity, 'cut' then existing audio and re-recorded. The format when opening was Mono 8000 Hz 32-bit Float. I exported what I recorded as U-law. That played successfully.

So I 'think' the 32-bit is relevant. I thought I tried that before, but maybe I didn't actually apply that formatting to the file before exporting. 

Thanks for the reply.

[Jonathan Schulenberg · Accepted solution]

You have to set the Project Rate to 8000Hz before recording audio.

[SteveK066]

Yes, thanks - the version of Audacity is different than the one I have at home. Found the setting for the sampling rate and set it to 8000 Hz before recording. 

[rikardkrvaric]

I use an online tool - it's not mine, but it works great.
You can see the code it uses to convert it yourself.

https://kernelmanic.com/call-manager-and-asterisk-audio-converter/

[SteveK066]

Interesting - I'll check it out.

Thanks.