Ahson, Syed A., <br/><br/>
VoIP Handbook:  Applications, Technologies, Reliability, and Security 

 - Boca Raton :  CRC Press,  c2009. 
 - xv, 454 p.:  [5E] 
<br/><br/><label>ISBN: </label>9781420070200 
<br/><br/><label>Dewey Class. No.: </label>004.695  / AHS/VOI