Kaza, Ramesh. CISCO IP telephony : planning, design, implementation, operation and optimization / Ramesh Kaza and Salman Asadullah. - Delhi : Pearson Educ., 2005. - xxiii, 648 p. ISBN: 8129709570 : Subjects--Topical Terms: Internet telephony. LC Class. No.: TK5105.8865 / .K39