Wallingford, Ted <br/><br/>
Switching to VolP 

 - Sebastopol  O'Reilly  2005 
 - xxi, 477 p. 
<br/><br/><label>ISBN: </label>0596008686 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INTERNET TELEPHONY
<br/><br/><label>Universal Decimal Class. No.: </label>004.7  / WAL