ISDN Dialer Backup Cisco Router
Cisco IOS Dial Technologies Configuration Guide, Release 12.2
One of things I'm working on lately is better ISDN backup of remote sites. Many have ISDN lines. But the way they were configured was not optimal. This Cisco guide is very very good, including links to scenarios you would consider.

Book-level PDF: Cisco IOS Dial Technologies Configuration Guide, Release 12.2
The individual parts of the document contain the most recent updates. The information in the document-level PDF (10.5 MB in size) is current as of June 30, 2005.
Using Cisco IOS Software
Part 1: Dial Interfaces, Controllers, and Lines
Part 2: Modem Configuration and Management
Part 3: ISDN Configuration
Part 4: Signaling Configuration
Part 5: Dial-on-Demand Routing Configuration
Part 6: Dial-Backup Configuration
Part 7: Dial-Related Addressing Services
Part 8: Virtual Templates, Profiles, and Networks
Part 9: PPP Configuration
Part 10: Callback and Bandwidth Allocation Configuration
Part 11: Dial Access Specialized Features
Part 12: Dial Access Scenarios
Part 13: Appendix
Index

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