Collier, Mark <br/><br/>
Hacking exposed : unified communications & VoIP security secrets & solutions (2nd ed.) 
Mark Collier and David Endler 
 - 2nd ed 
 - New York  McGraw-Hill Education  2014 
 - xxvi, 531pages  illustration  24cm 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780071798761 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer networks--security measures<br/>Internet telephony--security measures