Carrier-grade VoIP 
by Richard Swale, Daniel Collins. 
 - 3rd ed. 
 - New York  McGraw-Hill,  2014 
<br/><br/><label>ISBN: </label>9780071826600 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony. Computer network protocols. Speech processing systems. Multimedia systems. Switching theory. Internet telephony Automatic speech recognition. Instant messaging