Hersent oliver <br/><br/>
Ip Telephony packet-based multimedia communications systems / 
Hersent oliver. 
 - 1st ed 
 - U.S.A.:  addison-Wesley,  2000. 
 - xiii,455p;23cm 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0201619105 
<br/><br/><label>Dewey Class. No.: </label>004.62 HER