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

 - 3rd ed. 
 - New York :  Wiley- Interscience Publication,  c2000. 
 - xxv, 643 p.:  [E23] 
<br/><br/>This book is having appendixes from 573 - 607 
<br/><br/><label>ISBN: </label>9788126509294 
<br/><br/><label>Dewey Class. No.: </label>621.385  / BEL/DIG