Johnston, Alan B. <br/><br/>
Understanding Voice over IP security 
Alan B. Johnston, David M. Piscitello. 
 - Boston, MA :  Artech House,  c2006. 
 - xvii, 261 p. :  ill. ;  24 cm. 
 - Artech House telecommunications library .
<br/><br/><label>ISBN: </label>1596930500 9781596930506 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony--Security measures.<br/>TCP/IP (Computer network protocol)--Security measures.
<br/><br/><label>Dewey Class. No.: </label>005.8