ISUP Release Cause Values

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HEX VALUE                                                       CAUSE
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03                                                              No route to destination
06                                                              Channel unacceptable
08                                                              Preemption
0E                                                              Query on Release QoR
10                                                              Normal clearing
11                                                              User busy
12                                                              No user responding
13                                                              No answer from user (user alerted)
14                                                              Subscriber absent
15                                                              Call rejected
16                                                              Number changed
17                                                              Redirection to new destination
18                                                              Call rejected because of a feature at the destination
19                                                              Exchange routing error
1A                                                             Non selected user clearing
1B                                                             Destination out of Order
1C                                                             Invalid number format (address incomplete)
1D                                                             Facility rejected
1E                                                             Response to Status Enquiry
1F                                                             Normal, unspecified
22                                                             No circuit/channel available
26                                                             Network out of order
29                                                             Temporary failure
39                                                             Bearer capability not authorized
51                                                             Invalid call reference value
52                                                             Identified channel does not exist
54                                                             Call identity in use
57                                                             User not member of Closed User Group
58                                                             Incompatible destination
5F                                                             Invalid message, unspecified
60                                                             Mandatory information element is missing
6F                                                             Protocol error, unspecified
7F                                                             Interworking, unspecified

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