John C Bellamy <br/><br/>
Digital Telephony 

 - 3rd 
 - New Delhi  Wiley Publication  2010 
 - 643p.  Rs:679 
 - 22953 .
<br/><br/><label>ISBN: </label>9788126509294 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital
<br/><br/><label>Dewey Class. No.: </label>621.385