Bellamy, J.C. <br/><br/>
Digital telephony. 3ed. 
By  J.C. Bellamy 
 - NULL 
 - NULL  John wiley  New York.  NULL 
 - NULL 
<br/><br/> Engineering 
<br/><br/><label>ISBN: </label>NULL 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics