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Bronze

Crackle on uploaded MOH files

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?

Everyone's tags (2)
7 REPLIES
New Member

Crackle on uploaded MOH files

Anyone else run into this?  I'm running into something similar.

Hall of Fame Super Red

Crackle on uploaded MOH files

Hi Joshua,

Just wanted to reference the required file format

Format:

Average Data Rate 8.0 kb/second

Sample Rate 8.0 Khz

Audio Sample Size 8.0 Bit

Channels 1 (Mono)

Cheers!

Rob

New Member

Crackle on uploaded MOH files

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

Additional Information

See the "Related Topics" section.

Creating Audio Sources

Most standard wav files serve as valid input audio source files, including the following file types:

•16-bit PCM (stereo/mono)

•8-bit CCITT a-law or mu-law (stereo/mono)

"

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmfeat/fsmoh.html#wp1027441

Hall of Fame Super Red

Crackle on uploaded MOH files

Hi Joshua,

You are most correct my friend But I thought you may have

been using the same format as Paul noted;

"I've pre-converted the source to .wav (32-bit stereo)."

We've had the best results with 8-bit /mono

Cheers!

Rob

"Spend your life waiting,
for a moment that just don't come,
Well, don't waste your time waiting" 

-Springsteen

New Member

Re: Crackle on uploaded MOH files

Oh gotcha.  Thanks for getting my wheels spinning on the format types.  I've actually tried 16-bit mono PCM.  I'll give 8-bit a go and see if it helps.

-Joshua

New Member

Re: Crackle on uploaded MOH files

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.

Message was edited by: Joshua Learn

Message was edited by: Joshua Learn

Hall of Fame Super Red

Crackle on uploaded MOH files

Hi Joshua,

Thanks for posting back with your results here +5

This type of follow-up is most helpful to others here @ CSC.

Cheers!

Rob

"Clocks go slow in a place of work
Minutes drag and the hours jerk" 

-The Clash

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