Donohue, Denise <br/><br/>
Cisco Voice Gateways and GateKeepers  Understanding and configuring GW/GK in complex VoIP networks 

 - India  Pearson  2007 
<br/><br/><label>ISBN: </label>9788131718100 
<br/><br/><label>Dewey Class. No.: </label>004.67  / DON