Has anyone been able to integrate a single lync cluster with a multi cluster CUCM/Cups enviorment? Globally, we have only a single Lync cluster enviorment, where as we have 3 cucm clusters based on regions.
In short, i do not see anyway for Lync or cups to be configured to support this.
With the disclaimer that I haven't done this, sure I'll take a swing at it.
You would need a IM&P/CUP server/cluster for each CUCM cluster as they are locked in a 1:1 pairing due to the Informix database being increasingly shared between them. From Lync's perspective you would essentialy repeat the integration three times, with unique SIP Routes for each server/cluster. The Line Server URI for the user would then have the cluster-specific right hand side value. Example: sip:email@example.com.