Typically Used ISDN Elements - Cause (Q.850)
ID Name Whole name
1 Unassnumb Unassigned number
6 Unaccchan Channel unacceptable
16 Clear Normal call clearing
17 Userbusy User busy
21 Reject Call rejected
27 Destout Destination out of order
28 Invformat Invalid number format
30 Stsenqresp Response to StatusEnquiry
31 Normal Normal, unspecified
34 Noanychan No channel available
41 Tempfail Temporary failure
42 Swcongest Switching equipment congestion
44 Noreqchan Requested channel not available
65 Nobearer Bearer capability not implemented
81 Callref Invalid call reference value
88 Dest Incompatible destination
96 Elemmiss Mandatory information element is missing
97 Message Message type non-existent or unimplemented
99 Element Information element / parameter non-existent or unimplemented
100 Elemerror Invalid information element contents
101 Incmess Message incompatible with call state
102 Timeout Recovery on timer expiry
127 Undefined Interworking, unspecified
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