Telcoengineer,
The issue is that the EM save the recordings as rhetoric files and the UVM saves them as G.729A files. You used to be able to get a program from Inter-Tel that converted rhetoric files to wav files, but I can't seem to find it anywhere at the moment. If you do that them you could convert them to G.729A (8kbs mono) and get them to work, but that is not a supported solution; although I have done it. It is usually best to just rerecord them as it takes a long time to set everything up to get it working properly. I have only given you the overview of how I have done it, but there are other obvious steps that I have omitted.
Thanks,
TE