audacity can be used to convert a wav file into the proper format. this can be done by going to file->export audio->save as type: other uncompressed files->options… then choosing WAV and U-Law

there’s a bit more to it than just uploading the wav file to UCM via Media Resources->MOH Audio File Management. for one, the wav file will need to be uploaded to the publisher and each subscriber. it is not automatically replicated to the other UCM servers. secondly, the wav file must be associated with an MOH audio source (enable allow multi-casting). also the media streaming service is now named “Cisco IP Voice Media Streaming App” in case it needs to be restarted (seems like this needs to be done on each cucm node).

the bulk admin tool can be used for mass changes with phones->update phones. alternatively, phones->add/update lines can be used if the MOH file is set at the line level.

source:
http://forum.audacityteam.org/viewtopic.php?f=46&t=78712

update 5/18/2016:
i was able to get cucm 9.1 to accept an audio file with a 44.1kHz sample rate, 16-bit PCM, mono (however it does appear that stereo is allowed).

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