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![Cover for Bernard E. Keiser · Digital Telephony and Network Integration (Paperback Book) [2nd ed. 1995. Softcover reprint of the original 2n edition] (2013)](https://imusic.b-cdn.net/images/item/original/216/9781461357216.jpg?bernard-e-keiser-2013-digital-telephony-and-network-integration-paperback-book&class=scaled&v=1564186037)