Ransome, James F. <br/><br/>
VOIP security 

 - New Delhi  Elsevier  2005 
 - xxvii, 402p.  20 cm.  PB 
<br/><br/><label>ISBN: </label>8131203018 
<br/><br/><label>Dewey Class. No.: </label>005.8  / RAN