Hersent, Olivier <br/><br/>
IP telephony :  deploying VoIP protocols and IMS infrastructure / 
Olivier Hersent 
 - 2nd ed. 
 - Chichester, West Sussex :  John Wiley,  2010 
 - xxxiii, 439 p. :  ill. ;  26 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9780470665848 047066584X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony<br/>Convergence (Telecommunication)