Walker, John Q and Hicks, Jeffrey T. <br/><br/>
Taking change of your VoIP project / 

 - USA,  Cisco Press,  c2004. 
 - xviii, 294p. ;  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>1587200929 
<br/><br/><label>Dewey Class. No.: </label>004.6