Collins, Daniel Carrier grade voice over IP / Daniel Collins - 2nd ed. , international ed. - Boston, Mass. : McGraw-Hill, 2003 - 522 p. : ill. - McGraw-Hill networking professional . Includes bibliographical references and index ISBN: 0071231552 Subjects--Topical Terms: INTERNET TELEPHONY LC Class. No.: TK5105.8865 / C644C 2003