Q.850 CAUSE CODES

  • 0 Valid cause code not yet received
  • 1 Unallocated (unassigned) number
  • 2 No route to specified transit network (WAN)
  • 3 No route to destination
  • 4 send special information tone
  • 5 misdialled trunk prefix.
  • 6 Channel unacceptable
  • 7 Call awarded and being delivered in an established channel
  • 8 Prefix 0 dialed but not allowed
  • 9 Prefix 1 dialed but not allowed
  • 10 Prefix 1 dialed but not required
  • 11 More digits received than allowed, call is proceeding
  • 16 Normal call clearing
  • 17 User busy
  • 18 No user responding
  • 20 Subscriber absent
  • 19 no answer from user
  • 21 Call rejected
  • 22 Number changed
  • 23 Reverse charging rejected
  • 24 Call suspended
  • 25 Call resumed
  • 26 Non-selected user clearing
  • 27 Destination out of order
  • 28 Invalid number format (incomplete number)
  • 29 Facility rejected
  • 30 Response to STATUS ENQUIRY
  • 31 Normal, unspecified
  • 33 Circuit out of order
  • 34 No circuit/channel available
  • 35 Destination unattainable
  • 37 Degraded service
  • 38 Network (WAN) out of order
  • 39 Transit delay range cannot be achieved
  • 40 Throughput range cannot be achieved
  • 41 Temporary failure
  • 42 Switching equipment congestion
  • 43 Access information discarded
  • 44 Requested circuit channel not available
  • 45 Pre-empted
  • 46 Precedence call blocked
  • 47 Resource unavailable – unspecified
  • 49 Quality of service unavailable
  • 50 Requested facility not subscribed
  • 51 Reverse charging not allowed
  • 52 Outgoing calls barred
  • 53 Outgoing calls barred within CUG
  • 54 Incoming calls barred
  • 55 Incoming calls barred within CUG
  • 56 Call waiting not subscribed
  • 57 Bearer capability not authorized
  • 58 Bearer capability not presently available
  • 63 Service or option not available, unspecified
  • 65 Bearer service not implemented
  • 66 Channel type not implemented
  • 67 Transit network selection not implemented
  • 68 Message not implemented
  • 69 Requested facility not implemented
  • 70 Only restricted digital information bearer capability 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 Called user not member of CUG
  • 88 Incompatible destination
  • 89 Non-existent abbreviated address entry
  • 90 Destination address missing, and direct call not subscribed
  • 91 Invalid transit network selection (national use)
  • 92 Invalid facility parameter
  • 93 Mandatory information element is missing
  • 95 Invalid message, unspecified
  • 96 Mandatory information element is missing
  • 97 Message type non-existent or not implemented
  • 98 Message not compatible with call state or message type non-existent or not implemented
  • 99 information element nonexistent or not implemented
  • 100Invalid information element contents
  • 101Message not compatible with call state
  • 102Recovery on timer expiry
  • 103parameter non-existent or not implemented – passed on
  • 111Protocol error unspecified
  • 127Internetworking, unspecified

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