Hersent, Olivier. Gurle, David. Petit, Jean Pierre. <br/><br/>
IP telephony  Packet-based Multimedia Communications Systems 

 - NEW DELHI  PEARSON  2002 
 - x+456p.,22X17Cms. 
<br/><br/><label>ISBN: </label>8178082586 
<br/><br/><label>Dewey Class. No.: </label>621.385 H572