Hilton, Ronald W. <br/><br/>
Digital telephony 
John C. Bellamy. 
 - 7th ed. 
 - Boston  McGraw-Hill/Irwin  c2008 
 - xxxv, 824p.:  col. ill.;  29cm 
<br/><br/>Includes bibliographical references (p. 796-798) and indexes 
<br/><br/><label>ISBN: </label>0073022853 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Managerial accounting