Douskalis,  Bill <br/><br/>
IP  Telephony 

 -  Prentice  Hall  c2000 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0130141186 
<br/><br/><label>Dewey Class. No.: </label>384.64 D75 2000