Bellamy.J <br/><br/>
Digital telephony.3rd.ed. 

 - New Delhi  :  John Wiley & Sons,  2010. 
 - 912 
<br/><br/><label>ISBN: </label>978-81-265-0912-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical Electronics Communication,
<br/><br/><label>Dewey Class. No.: </label>621.382  / BEL