
ISDN Cause and Diagnostic Codes 202
ISDN Cause and Diagnostic Codes
This section lists all ISDN cause and diagnostic codes according to the ISDN
switch type. These codes can be useful when tracing the source of problems
with an ISDN connection. Note that some cause values may have further
meanings in addition to the diagnostics given. Also, Diagnostic shown as
“None” indicates that the diagnostic is not applicable, not documented, or
unavailable.
NI-1 (North America)
1. CCITT-standardized cause values:
Implementation Country / Region Page
NI-1 North America 202
TPH1962 Australia 205
Euro and INS-Net 64 Europe and Japan 206
AT&T 5ESS North America 209
Hex Cause Diagnostic
01 Unallocated (unassigned) number None
02 No route to specified transit network None
03 No route to destination None
06 Channel unacceptable None
07 Call awarded and being delivered in an established channel None
10 Normal call clearing None
11 User busy None
12 No user responding None
13 No answer from user (user alerted) None
15 Call rejected None
16 Number changed None
1A Non-selected user clearing None
1B Destination out of order None
1C Invalid number format (incomplete address) None
1D Facility rejected None
1E Response to status inquiry None
1F Normal, unspecified None
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