I would like to force phones to use TOH. I read that the tone is actually generated by the DSPs in Cisco land. I was wondering, however, is there a way I can get the wav file and translate it on CCM to force all to use it other than hiding the MOH servers from the MRG?
You cannot delete the clusterwide parameter for the default MOH sources, but you can, as you mentioned, set them to a source that does not exist. So, you could configure these parameters to nonexistent sources, create a device pool for the phones for which you want music on hold and set the MOH sources to None for this DP. You'll also need to make sure that the MOH sources on the phones and DNs are set to None.