Hersent, Olivier <br/><br/>
Ip Telephony: Packet-Based Multimedia Communications Systems 
Olivier Hersent, 
 - Singapore  Pearson Education Pte. Ltd  2002. 
 - xviii, 456 p. : ; 24 cm   ill.  24 cm 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>8178082586 
<br/><br/><label>Dewey Class. No.: </label>004.6