Hersent, Olivier. Petit, Jean, Pierre. Gurle, David. <br/><br/>
Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony 

 - CHICHESTER  Wiley  2005 
 - ix+261p.,25X16Cms. 
<br/><br/><label>ISBN: </label>9780470023624 
<br/><br/><label>Dewey Class. No.: </label>621.385 H572