ISDN Cause codes meaning

ISDN cause codes are used to describe reasons for hang up. Here is the full list of ISDN codes and their meaning:

  • 1. Unallocated (unassigned) number
  • 2. No route to specific transit network
  • 3. No route to destination
  • 4. Send special info tone
  • 5. Misdialed trunk prefix
  • 6. Channel unacceptable
  • 7. Call awarded and being delivered in established channel
  • 8. Preemption
  • 9. Preemption – circuit reserved for reuse
  • 16. Normal call clearing
  • 17. User busy
  • 18. No user responding
  • 19. No answer from user (user alerted)
  • 20. Subscriber absent
  • 21. Call rejected
  • 22. Number changed
  • 23. Redirect to new destination (unallocated destination number ANSI)
  • 24. Unknown business group (ANSI)
  • 25. Exchange routing error (ANSI)
  • 26. Non-selected user clearing
  • 27. Destination out of order
  • 28. Invalid number format
  • 29. Facility rejected
  • 30. Response to STATUS ENQUIRY
  • 31. Normal, unspecified
  • 34. No circuit/channel available
  • 38. Network out of order
  • 39. Permanent frame mode connection out of service
  • 40. Permanent frame mode connection operational
  • 41. Temporary failure
  • 42. Switching equipment congestion
  • 43. Access information discarded
  • 44. Requested channel/circuit not available
  • 45. Preemption (ANSI)
  • 46. Precedence call blocked
  • 47. Resources unavailable, unspecified
  • 49. Quality of service unavailable
  • 50. Requested facility not subscribed
  • 51. Call type incompatible with service request (ANSI)
  • 53. Outgoing calls barred within CUG
  • 54. Call blocked due to group restrictions (ANSI)
  • 55. Incoming calls barred within CUG
  • 57. Bearer capability not authorized
  • 58. Bearer capability not presently available
  • 62. Inconsistency in designed outg. access inf. and subscr. class
  • 63. Service or option not available, unspecified
  • 65. Bearer capability not implemented
  • 66. Channel type not implemented
  • 69. Requested facility not implemented
  • 70. Only restricted digital bearer cap. is available
  • 79. Service or option not implemented, unspecified
  • 81. Invalid call reference value
  • 82. Identified channel does not exist
  • 83. A suspended call exists, but this call identity does not
  • 84. Call identity in use
  • 85. No call suspended
  • 86. Call having the requested call identity has been cleared
  • 87. User not member of CUG
  • 88. Incompatible destination
  • 90. Non-existing CUG
  • 91. Invalid transit network selection
  • 95. Invalid message, unspecified
  • 96. Mandatory information element is missing
  • 97. Message type non-existing or not implemented
  • 98. Message incompatible with call state or mesg type non-existent or not implemented
  • 99. Information element non-existent or not implemented
  • 100. Invalid information element contents
  • 101. Message not compatible with call state
  • 102. Recovery on timer expiry
  • 103. Parameter non-existent or not implemented - passed on
  • 110. Message with unrecognized parameter discarded
  • 111. Protocol error, unspecified
  • 127. Interworking, unspecified

For more info, check this summary.

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