Porter, ThomasKancbirz, JanZmolek, Andy et al. <br/><br/>
Practical VOIP security 

 - Mumbai  Shroff  2006 
 - xxviii+563 
<br/><br/> Content page available 
<br/><br/><label>ISBN: </label>9800000000000 
<br/><br/><label>Dewey Class. No.: </label>004.62  POR;1  R