[cisco-voip] how to transform calling party number and show the calling name with UCM 8.x?

[ciscozest]

I have a single UCM 8.5 cluster with multiple sites. The inter site calls
are sent through PSTN so when the remote site users receiving the call from
main site, the remote phone will display the DID number without name. Is
there a way we can tweak this such as to convert the incoming number to an
internal number at the main site and then UCM intelligently match the
extension and show the name of calling party? I read some notes about
calling party transformation but have no idea if this is will achieve what I
want.
If anyone of you have done this with UCM or have a sample setup for this,
please share and any feedback is appreciated. Thanks
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