Release (ISUP)

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Introduction to ISUP Release :

Release code is usually used to identified and debug any events occurring in ISUP signaling. Every event in ISUP signaling generates release code number. Even for a normal ISUP call a release code is generated.There are lot of applications developed based on the release code from ISUP signaling. Similarly Telecom operators traces for Release code to debug any call failures. So the release code plays very important role in Telecom signaling.

Following are the List of releases codes used

Number in Release Cause

  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
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15
  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. 23
  24. 24
  25. Exchange routing error
  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
  32. 32
  33. 33
  34. No circuit/channel available
  35. 35
  36. 36
  37. 37
  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. 45
  46. Precedence call blocked
  47. Resources unavailable, unspecified
  48. 48
  49. Quality of service unavailable
  50. Requested facility not subscribed
  51. 51
  52. 52
  53. Outgoing calls barred within CUG
  54. 54
  55. Incoming calls barred within CUG
  56. 56
  57. Bearer capability not authorized
  58. Bearer capability not presently available
  59. 59
  60. 60
  61. 61
  62. Inconsistency in designed outg. access inf. and subscr. class
  63. Service or option not available, unspecified
  64. 64
  65. Bearer capability not implemented
  66. Channel type not implemented
  67. 67
  68. 68
  69. Requested facility not implemented
  70. Only restricted digital bearer cap. is available
  71. 71
  72. 72
  73. 73
  74. 74
  75. 75
  76. 76
  77. 77
  78. 78
  79. Service or option not implemented, unspecified
  80. 80
  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
  89. 89
  90. Non-existing CUG
  91. Invalid transit network selection
  92. 92
  93. 93
  94. 94
  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
  104. 104
  105. 105
  106. 106
  107. 107
  108. 108
  109. 109
  110. Message with unrecognized parameter discarded
  111. Protocol error, unspecified
  112. 112
  113. 113
  114. 114
  115. 115
  116. 116
  117. 117
  118. 118
  119. 119
  120. 120
  121. 121
  122. 122
  123. 123
  124. 124
  125. 125
  126. 126
  127. Interworking, unspecified

Release only with number doesn’t define and it is possible to use them for proprietary solution.