Yachik YenRay-I ChangYen, YachikYachikYenChang, Ray-IRay-IChangRAY-I CHANG2018-09-102018-09-102008http://www.airitilibrary.com/Publication/Index/20720971-200812-1-1-46-53-ahttp://scholars.lib.ntu.edu.tw/handle/123456789/341543application/pdfAn Object-Oriented Administration Tool for IP-PBXjournal article