Porter, Thomas <br/><br/>
Practical VoIP Security 
Porter, Thomas 
 -  Syngress Publishing  2006 
 - On-campus e-Book by ebrary under Digital Library Program of Higher Education Commission (HEC) of Pakistan 
<br/><br/><label>ISBN: </label>9780080489551     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering & Technology