Appreciate the response. After some digging last night I found this note on Cisco's site. See the second question from this link quoted below: Other than that I think you're rights. They must have intentionally restricted the capability presumably for marketing reasons I'm speculating.
"Interoperability and Relationship to Other Cisco Platforms
Q. Can multiple systems be networked together?
A. Yes, 3 to 5 Cisco Unified Communications 500 Series systems can be configured to work together. If there is a requirement for additional site-to-site networking, it is recommended that you deploy the Integrated Services Router family for those scenarios.
Q. Can the Cisco Unified Communications 500 Series be networked with Cisco Unified CME or Cisco Unified Communications Manager?
A. The Cisco Unified Communications 500 Series can be networked with an integrated services router-based Cisco Unified CME, but the Cisco Unified Communications 500 Series does not work with Cisco Unified Communications Manager.
Java, all that is fine with me. Just report to high powers, considering the answer is Yes, 3 to 5 Cisco Unified Communications 500 and not Up to 3 to 5, there can be a case where "2 boxes" is "less than 3", but still "networking" on my book :)
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