Collier, Mark D., <br/><br/>
Hacking exposed :  unified communications & VoIP security secrets & solutions / 
Mark Collier, David Endler. 
 - Second edition. 
 - xxvi, 531 pages :  illustrations ;  24 cm 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780071798761 (paperback) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony---- Security measures.<br/>Computer networks---- Security Measures.
<br/><br/><label>LC Class. No.: </label>TK5105.8865  / .E53 2014