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"Don't go through life with a catcher's mitt on both hands.
You need to be able to throw something back."
ISDN Page - This is the definitive ISDN reference on the Web.
ISDN Book Store - You can place an order On-Line!
ISDN Zone - This is a *cool* ISDN web site.
Telecom Information Resources
International Telecommunications Union (ITU)
Q.931 Error Codes
About BONDING and Multilink-PPP
Network Computing's ISDNsights
Pac*Bell ISDN User Guide
Newsgroup of interest: comp.dcom.isdn or on Google Groups