packet-based multimedia communications systems Hersent, Olivier creator Gurle, David Pearson New Delhi 2003 xviii, 456 p. Section 1.The Application Layer IP Telephony Protocols (Page-1), Section 2. Voice Technology Background (Page-195), Section 3. The Network (Page-293). Olivier Hersent, David Gurle and Jean-Pierre Petit Telecommunication engineering 621.38212,HER 8178082586 2004026217 20221212123548.0