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内線電話 - Wikipedia
http://ja.wikipedia.org/wiki/%E5%86%85%E7%B7%9A%E9%9B%BB%E8%A9%B1
KDDI : 内線機能 > 内線電話をお使いいただくには
http://www.au.kddi.com/business/manual/e02sa/office/office04.html
KDDI ビジネスコールダイレクト | 内線ソリューション | KDDI株式会社
http://www.kddi.com/business/call_direct/index.html?cid=48998-1003
