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After that remove all old .wav files from /var/sipxdata/mediaserver/data/moh/ and copy the wav files from the freeswitch music archive http://files.freeswitch.org/freeswitch-sounds-music-16000-1.0.8.tar.gz. Once you're done with that, browse to System >> Servers >> <server_name> >> Media Services and then click Apply. sipXecs will ask you to restart Media Services in sipXconfig. The , do so at your convenience. After you restart media services, the next time you are put on hold you will be listening to HD music on hold!