We recently uploaded some new music to our CUCM 8.6 cluster. I've pre-converted the source to .wav (32-bit stereo). When I play the file on my computer, it sounds perfect. When I upload it to CUCM, there is a crackling noise layered on top of the music. It seems like the conversion process CUCM is using is adding noise into the audio file when it converts it.
Anyone with insight into how I can prevent CUCM from degrading teh audio?
Thanks Rob. I thought just about any wav file would work. The docs say
When the administrator imports an audio source file, the Cisco Unified Communications Manager Administration window interface processes the file and converts the file to the proper format(s) for use by the music on hold server.
•The recommended format for audio source files includes the following specifications:
•16-bit PCM wav file
•Stereo or mono
•Sample rates of 48 kHz, 32 kHz, 16 kHz, or 8 kHz
See the "Related Topics" section.
Creating Audio Sources
Most standard wav files serve as valid input audio source files, including the following file types:
We have tried a few more format combinations and found the sampling rate was our issue. Our music files were originally sampled at 44kHz and UCM was not converting them well. We have since dropped them to 16kHz. It seems that UCM handles the 16kHz files better as we no longer have the crackling noise in the resulting files.
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