VoIP handbook :  applications, technologies, reliability, and security / 
edited by Syed A. Ahson, Mohammad Ilyas 
 - Boca Raton :  CRC Press,  c2009 
 - xv, 454 p. :  ill., map ;  26 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>1420070207 9781420070200 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony--Handbooks, manuals, etc