There are two parties to each call; when Party A puts Party B on hold (or starts a transfer, which starts with a hold):
1) The config of the party instigating the hold determines which MoH source is played out (based on the Network Hold Audio Source in the case of a transfer, typically you set the User Hold source to the same)
2) The config of the party being put on hold determines where the MoH comes from (based on that parties' MRGL).
So as you say, you could remove the MoH from the GW MRGL. THe side effect of this would be that no MOH would ever be played to outside callers; even if you put someone on hold yourself from your deskphone.
From a resource point of view there's no point playing MoH to Unity, so there's no harm in removing MoH from Unity's MRGL (assuming that MRGL isn't shared with other users).
To stop MoH being played during the transfer you can just set the MoH Audio source on the Unity ports to an unused source number.
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I looked on CUCM 7.x VM Ports and I dont see where you can actually add individual MoH resource on the ports themselves. I looks like MoH can come from either the Device Pool or Common Device Profile? Unless I am missing something
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