CCIE Practical Studies: Security (CCIE Self-Study)

ISDN Cause Values

Now that you have the class and value of the cause value (in hexadecimal, of course), you need a way to decode this to help you further isolate your problem. Table C-3 describes these values, referred to as the cause information element. If you are using the debug isdn q931 command to obtain your output, drop the highest bit of the cause value (for example, 0x90 becomes 0x10) before consulting this table. (The notes referred to in the Diagnostics column appear after the table.)

Table C-3. ISDN Cause Values

Decimal Value	Hex Value	Cause	Diagnostic	Explanation
1	01	Unallocated (unassigned) number	Note 10	ISDN number is sent to the switch in the correct format; however, the number is not assigned to any destination equipment.
2	02	No route ...