This document outlines a process for migrating from UC500 models to Business Edition 6000.
For additional migration information, please see: http://www.cisco.com/en/US/partner/products/ps11369/products_partner_resources_list.html(Requires partner login).
Do you mean when migrate to BE6K you can use SPA phones or not?
SPA phones are not supported by the BE6000.
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