Aastra 5000 is ranked 18th in Unified Communications while Avaya ACE [EOL] doesn't meet the minimum requirements to be ranked in Unified Communications. Aastra 5000 is rated 0.0, while Avaya ACE [EOL] is rated 0.0. On the other hand, Aastra 5000 is most compared with , whereas Avaya ACE [EOL] is most compared with .
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