ISDN Newsgroup
FAQ from OCN a major advocate for ISDN, who also maintains an
ISDN Info Center
with information on availability, deployment, a glossary, User's Guide etc.
Dan Kegel's ISDN Page
is devoted to dial-up telecommunications service, and includes:
answers to basic ISDN questions, lists of service, hardware & software vendors,
links to ISDN related databases and discussions.
California ISDN User's Group (CIUG)
holds semi-annual conferences offering a wide range of ISDN
seminars for everyone from digital rookies to pros.