Collins, Daniel. <br/><br/>
Carrier grade voice over IP  [Book] / 
Daniel Collins. 
 - 2nd ed. 
 - New York :  McGraw-Hill,  c2003. 
 - xviii, 522 p. :  ill. ;  24 cm. 
 - McGraw-Hill networking professional .
<br/><br/> All. 
<br/><br/><label>ISBN: </label>0071231552 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Internet telephony.
<br/><br/><label>Dewey Class. No.: </label>004.69