Hi Patricio,
Fixed Music On Hold Audio Source Configuration
The music on hold server supports one fixed-device stream source in addition to the file stream sources. This source represents the fixed audio source, which gets configured in the Fixed Music On Hold (MOH) Audio Source Configuration window. The fixed audio source gets sourced from a fixed device that uses the local computer audio driver.
For each cluster, you may define one fixed audio source. You must set up the fixed audio source that is configured per cluster on each MOH server. To do so, use the Cisco USB MOH sound adapter, which must be ordered separately.
Here is the config info;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a0080739bf0.html#wp1095813
Hope this helps!
Rob
