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CUC in an SME Environment

Hi Experts,

I'm trying to better understand how CUC is integrated in an SME environment.  The design is a centralised SME cluster with CUCM leaf clusters in 3 regions.  All 3 leaf clusters are to share a 20K user CUC cluster.  The CUC is to have a SIP integration.

Is it the case that the CUC cluster still needs to be integrated with the 3 leaf clusters as one would normally do, i.e. create 3 telephony integrations in CUC and assign a SIP port group to each with the SME being used only for the call routing i.e. a SIP trunk pointing to the CUC cluster?

Thanks.