Wittenberg, Nicholas. <br/><br/>
Understanding voice over ip technology  [[Book] /] 
Nick Wittenberg. 
 - inter ed. 
 - Clifton Park, NY :  Delmar Cengage Learning,  2009. 
 - vii,387p ; :  ill ;  24cm. +  1 CD-ROM (4 3/4 in) 
<br/><br/> includies index includies CD 
<br/><br/> All age. 
<br/><br/><label>ISBN: </label>9780840031303 0840031300 
<br/><br/><label>Subjects--Personal Names: </label><br/>internet technology
<br/><br/><label>Dewey Class. No.: </label>621.382 
<br/><br/><label>National Library of Medicine Call No.: </label>621.382  / WU