| 0 | Valid cause code not yet received | 50 | Requested facility not subscribed | 1 | Unallocated (unassigned) number - wrong dial # | 51 | Reverse charging not allowed | 2 | No route to specified transit network (WAN) | 52 | Outgoing calls barred | 3 | No route to destination | 53 | Outgoing calls barred within CUG | 4 | Send special information tone | 54 | Incoming calls barred | 5 | Miss dialed trunk prefix | 55 | Incoming calls barred within CUG | 6 | Channel unacceptable | 56 | Call waiting not subscribed | 7 | Call awarded, being delivered in an established channel | 57 | Bearer capability not authorized | 8 | Prefix 0 dialed but not allowed | 58 | Bearer capability not presently available | 9 | Prefix 1 dialed but not allowed | 63 | Service or option not available, unspecified | 10 | Prefix 1 dialed but not required | 65 | Bearer service not implemented | 11 | More digits received than allowed, call is proceeding | 66 | Message not implemented | 16 | Normal call clearing | 67 | Transit network selection not implemented | 17 | User busy | 68 | Message not implemented | 18 | No user responding | 69 | Requested facility not implemented | 19 | No answer from user (user alerted) | 70 | Only restricted digital information bearer capability is available | 21 | Call rejected | 79 | Service or option not implemented, unspecified | 22 | Number changed | 81 | Invalid call reference value | 23 | Reverse charging rejected | 82 | Identified channel does not exist | 24 | Call suspended | 83 | A suspended call exist, but this call identity does not | 25 | Call resumed | 84 | Call identity in use | 26 | Non-selected user clearing | 85 | No call suspended | 27 | Destination out of order | 86 | Call having the requested call identity has been cleared | 28 | Invalid number format (incomplete number) | 87 | Called user not member of CUG | 29 | Facility rejected | 88 | Incompatiible destination | 30 | Response to STATUS ENQUIRY | 89 | Non-existent abbreviated address entry | 31 | Normal, unspecified | 90 | Destination address missing, and direct call not subscribed | 33 | Circuit out of order | 91 | Invalid transit network selection (national use) | 34 | No circuit/channel available | 92 | Invalid facility parameter | 35 | Destination unattainable | 93 | Mandatory information element is missing | 37 | Degraded service | 95 | Invalid message, unspecified | 38 | Network (WAN) out of order | 96 | Mandatory information element is missing | 39 | Transit delay range cannot be acheived | 97 | Message type non-existent or not implemented | 40 | Throughput range cannot be acheived | 98 | Message not compatible with call state or message type non-existent or not implemented | 41 | Temporary failure | 99 | Information element non-existent or not implented | 42 | Switching equipment congestion | 100 | Invalid information element contents | 43 | Access information discarded | 101 | Message not compatible with call state | 44 | Requested circuit channel not available | 102 | Recovery on timer expiry | 45 | Preempted | 103 | Parameter non-existent or not implemented, passed on? | 46 | Precedence call blocked | 111 | Protocol error, unspecified | 47 | Resource unavailable, unspecified | 127 | Inter-networking, unspecified | 49 | Quality of service unavailable |