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IPセントレックス - Wikipedia
http://ja.wikipedia.org/wiki/IP%E3%82%BB%E3%83%B3%E3%83%88%E3%83%AC%E3%83%83%E3%82%AF%E3%82%B9
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http://www.freebit.com/ipbp/centrex.html
IPセントレックス、大解剖!/キーマンズネット
http://www.keyman.or.jp/3w/prd/86/30000586/
