7. ISDN Events and Errors
343
standards. Not all cause codes are universally supported across switch types.
Before using a particular cause code, compare its validity with the appropriate
switch vendor specifications.
Table 52. ISDN Network Error Codes
Error Name Hex Value
(Decimal) Q.931 Code and Description
UNASSIGNED _NUMBER 0x201
(513) Cause 01
Unassigned (unallocated)
number
NO_ROUTE 0x202
(514) Cause 02
No route to specified transit
network
CHANNEL_UNACCEPTABLE 0x206
(518) Cause 06
Channel unacceptable
NORMAL_CLEARING 0x210
(528) Cause 16
Normal call clearing
USER_BUSY 0x211
(529) Cause 17
User busy
NO_USER_RESPONDING 0x212
(530) Cause 18
No user responding
CALL_REJECTED 0x215
(533) Cause 21
Call rejected
NUMBER_CHANGED 0x216
(534) Cause 22
Number changed
DEST_OUT_OF_ORDER 0x21B
(539) Cause 27
Destination out of order