KESSLER (Gary C) and SOUTH WICK (Peter) <br/><br/>
ISDN Concepts, Facilities and Services  Textual Document 

 - 3rd  
 -  Mc Graw Hill New York,  1996 
 - xix, 672 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Dewey Class. No.: </label>621.382