Turn on music on a Nortel phone using F86. If all was installed correctly, you should start hearing music (it will be around 1 minute behind corporate).
It has been my experience that the volume controls on all PCs need to be set to the max.
The example I provided is probably the most complex, as you need to connect to the internet at corporate. If you choose to use a MOH device or CD player, you need to only purchase 1, rather than 1 for each location.