On Hold Music Information

Here you can configure the Music On Hold files that will be played. You can configure various 'Classes' of Music on Hold,
which are used in Queues. The idea behind that is your 'default' MOH is standard music, and your various queues can
have different 'hold' music while they're waiting.

Uploading a file
Simply select 'browse' and pick a MP3 file on your system. Then click 'Upload'. It will appear in the list of MOH files
below.

You may have a problem like below:
Error in MusicOnHold? - Warning, flexibel rate not heavily tested!
This warning shows due to the coding method of your MP3 music. Variable bitrate is not supported by Asterisk, so use your
favorite MP3 editing tool and convert the file to constant bitrate encoding. And since you are going to play this
music through the phone you for sure won't need anything higher than 128 bit/s, it is also a god idea to remove any tags as well

# lame -b 128 input.mp3 output.mp3