CCIE Practical Studies: Security (CCIE Self-Study)

Appendix C. ISDN Error Codes and Debugging Reference

This appendix covers the following topics:

• ISDN switch types

• ISDN cause code fields

• ISDN cause values

• ISDN bearer capability values

• ISDN progress field values

One of the most frustrating things you run into when working with ISDN is the error messages you receive upon a failure or during a debugging session. Unless you work with ISDN on a daily basis, chances are these messages will seem like a foreign language to you. Fortunately, you can memorize a few of these message codes to get you by in most situations you will encounter; the only problem is deciding which ones to memorize. As you work with ISDN more in your environment, you will gain an understanding of which of the numerous codes you need ...