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The Nortel Phone M5000 Centrex series by Aastra includes M5316, M5312, M5216, M5212, M5209, M5208, M5112, M5009, M5008 and expansion modules M536, M522 and M518.
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A full family of cost effective enterprise grade IP Telephones that have been designed for interoperability, upgradeability and ease of use .
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