Summers, Charles K. <br/><br/>
Isdn implementor's guide  : standards, protocols, & services 
/ [by] Charles K. Summers 
 - New York  McGraw-hill  1995 
 - x, 413 p. 
<br/><br/>  Includes references, index 
<br/><br/><label>ISBN: </label>70694168 
<br/><br/><label>Dewey Class. No.: </label>621.382  / SUM