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Appendix B
Cause and Diagnostic Codes
Cause Codes
Clearing Causes
The clearing cause recorded in a call packet provides a high-level indication of why
the call was cleared and where the error occurred (e.g., error by the source user, or
internal network error). For example, when the diagnostic code indicates that a pro-
tocol error occurred, the clearing cause might indicate that the error was committed by
the destination user (i.e., remote procedure error).
From DCE From DTE
Hex.
Dec. Hex. Dec. Abbr. Description
00 00 80 128
DTE DTE originated
01 01 81 129
OCC Number busy
02 02 82 130
(none) Password error (remote control, file
transfer, or alarm routing)
03 03 83 131
INV Invalid facility request
04 04 84 132
Remote control attempted while
non-interrupable operation in progress
05 05 85 133
NC Network congestion
09 09 89 137
DER Out of order
0B 11 8B 139
NA Access barred
0D 13 8D 141
PAD Not obtainable
11 17 91 145
RPE Remote procedure error
13 19 93 147
ERR Local procedure error
15 21 95 149
ROO RPOA out of order
19 25 99 153
RNA Reverse charge acceptance not subscribed
21 33 A1 161
ID Incompatible destination
29 41 A9 169
FNA Fast select acceptance not subscribed
39 63 B9 185
SA Ship absent