Correct, EM does not work across CMEs, so you will need to replicate all DN "profiles" in all sites where you expect user to log on, and use perhaps a SIP registration mechanism so that the extension can be reached globally.
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I never tested that, but I think if you configure a CME as SIP registrar or H.323 GK, the mobility DN will register to it when the user logs in, other CMEs will send all calls for non-local numbers to SIP registrar or via GK, so you should be alble to route always to the right place.
Kind of more advance design that you can entail after you're happy with all the other features of your system.
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