CUCM already has an option to not send MOH when in a conference call (you must use a CFB managed by CUCM and the phone has to be registered to that CUCM) but there is no way to dial something and disable the MOH for any other call.If a phone from PSTN places the call on hold you'll hear it since it's out of CUCM control.
Actually whether they get or no MOH doesn't really depend on your configuration, but in the other end configuration.
You only tell them what stream to listen, but if they don't have access to the MOH server they won't hear nothing
You would need to get in tourch with your AM and submit a PER for this if you need this.
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HTH
java
if this helps, please rate