we have configured CUC with CUCM in multisite with overlapping extension. Everything works as expected, like MWI, and site to site dialing with access code to reach to the right subscriber.
now we notice some issue with this design. Default CUC AA allows caller to dial an extension at any time. let's say there are two duplicate extensions in two diffferent sites. when caller dial the extension at the begining of AA to reach to userB in siteB, userA in siteA phone willl ring. because in voice port CSS in CUCM, siteA partition is the first partition.
the other solution would be seperate port and port group per each site, but it is not scalable and it is not feasible for more than 20 sites.
any suggestion would be very appreciated.