| Asterisk Value | ISDN Cause codes (Q.850 & Q.931 unless specified) | MFC/R2 | SIP/PJSIP | Motif |
|---|---|---|---|---|
| AST_CAUSE_NOT_DEFINED | Cause not defined | OR2_CAUSE_UNSPECIFIED | ||
| AST_CAUSE_UNALLOCATED | Unallocated (unassigned) number | 404, 485, 604 | ||
| AST_CAUSE_NO_ROUTE_TRANSIT_NET | 2. No route to specified transmit network | |||
| AST_CAUSE_NO_ROUTE_DESTINATION | 3. No route to destination | 420 | ||
| AST_CAUSE_MISDIALLED_TRUNK_PREFIX | 5. Misdialled trunk prefix (national use) | |||
| AST_CAUSE_CHANNEL_UNACCEPTABLE | 6. Channel unacceptable | |||
| AST_CAUSE_CALL_AWARDED_DELIVERED | 7. Call awarded and being delivered in an established channel | |||
| AST_CAUSE_PRE_EMPTED | ISUP – 8. Preemption | |||
| AST_CAUSE_NUMBER_PORTED_NOT_HERE | 14. QoR: ported number | |||
| AST_CAUSE_NORMAL_CLEARING | 16. Normal Clearing | OR2_CAUSE_NORMAL_CLEARING | gone, success | |
| AST_CAUSE_USER_BUSY | 17. User busy | OR2_CAUSE_BUSY_NUMBER | 486, 600 | busy |
| AST_CAUSE_NO_USER_RESPONSE | 18. No user responding | 408 | expired | |
| AST_CAUSE_NO_ANSWER | 19. No answer from user (user alerted) | OR2_CAUSE_NO_ANSWER | 480, 483 | |
| AST_CAUSE_SUBSCRIBER_ABSENT | 20. Subscriber absent | OR2_CAUSE_UNALLOCATED_NUMBER | ||
| AST_CAUSE_CALL_REJECTED | 21. Call Rejected | 401, 403, 407, 603 | cancel, decline | |
| AST_CAUSE_NUMBER_CHANGED | 22. Number changed | 410 | ||
| AST_CAUSE_REDIRECTED_TO_NEW_DESTINATION | 23. Redirected to new destination | |||
| AST_CAUSE_ANSWERED_ELSEWHERE | 26. Non-selected user clearing(ASTERISK-15057) | |||
| AST_CAUSE_DESTINATION_OUT_OF_ORDER | 27. Destination out of order | OR2_CAUSE_OUT_OF_ORDER | 502 | |
| AST_CAUSE_INVALID_NUMBER_FORMAT | 28. Invalid number format | 484 | ||
| AST_CAUSE_FACILITY_REJECTED | 29. Facility rejected | 501 | ||
| AST_CAUSE_RESPONSE_TO_STATUS_ENQUIRY | 30. Response to STATUS ENQUIRY | |||
| AST_CAUSE_NORMAL_UNSPECIFIED | 31. Normal, unspecified | |||
| AST_CAUSE_NORMAL_CIRCUIT_CONGESTION | 34. No circuit/channel available(Note that we’ve called this “Circuit/channel congestion” for a while which can cause confusion with code 42) | OR2_CAUSE_NETWORK_CONGESTION | general-error | |
| AST_CAUSE_NETWORK_OUT_OF_ORDER | 38. Network out of order | 500 | ||
| AST_CAUSE_NORMAL_TEMPORARY_FAILURE | 41. Temporary failure | 409 | ||
| AST_CAUSE_SWITCH_CONGESTION | 42. Switching equipment congestion | 5xx | failed-application | |
| AST_CAUSE_ACCESS_INFO_DISCARDED | 43. Access information discarded | |||
| AST_CAUSE_REQUESTED_CHAN_UNAVAIL | 44. Requested circuit/channel not available | |||
| AST_CAUSE_FACILITY_NOT_SUBSCRIBED | 50. Requested facility not subscribed | |||
| AST_CAUSE_OUTGOING_CALL_BARRED | 52. Outgoing call barred | |||
| AST_CAUSE_INCOMING_CALL_BARRED | 54. Incoming call barred | |||
| AST_CAUSE_BEARERCAPABILITY_NOTAUTH | 57. Bearer capability not authorized | |||
| AST_CAUSE_BEARERCAPABILITY_NOTAVAIL | 58. Bearer capability not presently available | 488, 606 | incompatible-parameters, media-error, unsupported-applications | |
| AST_CAUSE_BEARERCAPABILITY_NOTIMPL | 65. Bearer capability not implemented | |||
| AST_CAUSE_CHAN_NOT_IMPLEMENTED | 66. Channel type not implemented | |||
| AST_CAUSE_FACILITY_NOT_IMPLEMENTED | 69. Requested facility not implemented | unsupported-transports | ||
| AST_CAUSE_INVALID_CALL_REFERENCE | 81. Invalid call reference value | |||
| AST_CAUSE_INCOMPATIBLE_DESTINATION | 88. Incompatible destination | |||
| AST_CAUSE_INVALID_MSG_UNSPECIFIED | 95. Invalid message unspecified | |||
| AST_CAUSE_MANDATORY_IE_MISSING | 96. Mandatory information element is missing | |||
| AST_CAUSE_MESSAGE_TYPE_NONEXIST | 97. Message type non-existent or not implemented | |||
| AST_CAUSE_WRONG_MESSAGE | 98. Message not compatible with call state or message type non-existent or not implemented | |||
| AST_CAUSE_IE_NONEXIST | 99. Information element nonexistent or not implemented | |||
| AST_CAUSE_INVALID_IE_CONTENTS | 100. Invalid information element contents | |||
| AST_CAUSE_WRONG_CALL_STATE | 101. Message not compatible with call state | |||
| AST_CAUSE_RECOVERY_ON_TIMER_EXPIRE | 102. Recover on timer expiry | 504 | timeout | |
| AST_CAUSE_MANDATORY_IE_LENGTH_ERROR | ? Mandatory IE length error | |||
| AST_CAUSE_PROTOCOL_ERROR | 111. Protocol error, unspecified | failed-transport, security-error | ||
| AST_CAUSE_INTERWORKING | 127. Interworking, unspecified | 4xx, 505, 6xx | connectivity-error |
Link: Hangup Cause Mappings – Asterisk Project – Asterisk Project Wiki