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Nokia Network Voyager for IPSO 4.0 Reference Guide 67
ISDN Cause Values
Descriptions of the cause-value field of the cause-information element are shown in the
following ISDN cause value table. Cause-value numbers are not consecutive.
z1 Class of cause value
z2 Value of cause value
a1 (Optional) Diagnostic field that is always 8.
a2 (Optional) Diagnostic field that is one of the following values: 0 is
Unknown, 1 is Permanent, and 2 is Transient
Table 6 Cause Values
Cause Cause Description Diagnostics
1 Unallocated (unassigned) number Note 12
2 No route to specified transit network Transit-network identity (Note 11)
3 No route to destination Note 12
6 Channel unacceptable
7 Call awarded and being delivered in an
established channel
16 Normal call clearing Note 12
17 User busy
18 No user responding
19 No answer from user (user alerted)
21 Call rejected User-supplied diagnostic (Notes 4 & 12)
22 Number changed
26 Non-selected user clearing
27 Designation out of order
28 Invalid number format
29 Facility rejected Facility identification (Note 1)
Table 5 ISDN Cause Code Fields
Cause Code Description