Until recently, ISDN (Integrated Services Digital Network) was the butt of net-gurus' jokes, who claimed that it actually stood for "It Still Does Nothing". Now that ISDN is finally coming of age and being deployed internationally by telephone companies and others -- and promises to deliver high-speed data, audio, video, and real videoconferencing capabilities to homes and office -- everyone is beginning to realize that ISDN may in fact stand for "I Smell Dollars Now". As a former ISP employee who has dealt with telcos, I can honestly say that after reading this book, you might know more about ISDN than your service provider.
If you want to understand ISDN you have two choices: 1) buy this book or 2) marry someone who works at the phone company. The first will hold your interest a lot longer. Trust me. -- Scott Adams, Dilbert Cartoonist, and (former) Pacific Bell employee