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Wednesday, July 28, 2010

moh-usb-audio quality has diminished in CUCM 7.1

A PC connected to a Griffin imic worked very well with my previous CCM 4.2 cluster , the PC played back mp3 songs to a high quality. Now I have upgraded the cluster to CUCM 7.1 and forced to use moh-usb-audio, the quality has diminished. There is a definite background hiss, even when the iPOD / PC is not plugged in and the song itself has a poor quality sound.

We have tried with different mp3 / wav formats and I have played around with the settings within the services > Cisco IP Voice Media Streaming App, such as:

1. MOH Fixed Audio Quality level

2. Codec

3. volume levels

The reason for not using the internal CCM MOH service was because of the poor quality the songs had after they were converted to g711.

Do we have to use the "Cisco" MOH-USB-AUDIO device or are there alternatives, has anyone got the Griffin working on CUCM 7?


You won't get the Griffin iMic working with any linux-based CUCM simply because the OS and IP Voice Media Streaming App won't recognize the device.

To the original post in my experience hissing is typically caused be a high input gain from the audio source. I'd also look at potential grounding issues on the server itself (or the rack it's mounted in). Since the CUCM has no way to adjust the volume of MOH audio files it can only be adjusted at the source or from an intermediate device.

If you really can't get the USB audio device working to your satisfaction then one alternative would be using a router's FXO or E&M port for multicast MOH.For more details click here.

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1 comment :

  1. I would suggest installing a line isolation unit, which will clear up any background hiss on the line before delivering it to the CUCM platform.

    They are pretty cheap and you can get them at any decent telecommunications store.


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