Thermos, Peter <br/><br/>
Securing VoIP networks :  threats, vulnerabilities, and countermeasures / 
Peter Thermos and Ari Takanen 
 - Upper Saddle River, NJ :  Addison-Wesley,  2008 
 - xxiii, 359 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0321437349 (pbk.) 9780321437341 (pbk.)  RM136.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony--Security measures