Endler, David <br/><br/>
Hacking exposed VoIP :  voice over IP security secrets & solutions / 
David Endler, Mark Collier 
 - New York :  McGraw-Hill,  2007 
 - 539 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0072263644 9780072263640 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony--Security measures<br/>Computer networks--Security measures