Why is it so critical that an address change happen the same day? I've worked in both environments (centralized and de-centralized) and the centralized area works well, as long as changes are done within 24 hours of when they're received - as a standard. Ours was set up so that if changes were faxed over by 4pm, they would be completed same day (assuming, of course, that they didn't hold all maintenance until 4pm and the fax was working!). We didn't miss many deadlines.
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Opinions are mine and never to be taken as legal advice!