Aastra Clearspan is ranked 17th in IP Telephony & Unified Communications while Polycom ATX doesn't meet the minimum requirements to be ranked in IP Telephony & Unified Communications. Aastra Clearspan is rated 0.0, while Polycom ATX is rated 0.0. On the other hand, Aastra Clearspan is most compared with , whereas Polycom ATX is most compared with .
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