Isdn: Concepts, Facilities, and Services (McGraw-Hill Series on Computer Communications): Kessler, Gary C., Southwick, Peter V.: 9780070342491: Amazon.com: Books
ISDN and Broadband ISDN with Frame Relay and ATM, 4th Edition : William Stallings: Everything Else - Amazon.com
Isdn Implementor's Guide: Standards, Protocols, & Services (McGraw-Hill Series on Computer Communications): Summers, Charles K.: 9780070694163: Amazon.com: Books