Cause codes of ISDN and there Effects
- Cause No.1
- Cause No.2
- etc
Cause No. 1 - Unallocated (Unassigned) Number
This causes indicates that the destination requested by the calling user cannot be reached because, although the number is in a valid format, it is not currently assigned.
Cause No. 2 - No Route To Specified Transit Network
This cause indicates that the equipment sending this causes has received a request to route the call through a particular transit network, which it does not recognize.The equipment sending this causes does not recognize the transit network does not exist or because that particular transit network, while it does exist, does not serve the equipment, which is sending this cause.
Cause No. 3 - No Route To Destination
This cause indicates that the called party cannot be reached because the network through which the call has been routed does not serve the destination desired. This cause is supported on a network dependent basis.
Cause No. 4 - Send Special Information Tone (Five One Zero NT)
This cause indicates that the called party cannot be reached for reasons that are of a long term nature and that the special information tone should be returned to the calling party.
Cause No. 5 - Misdialed Trunk Prefix
This cause indicates the errorneous inclusion of a trunk prefix in the called party number. This number is supposed to be striped from the dialed number being sent to the network by the customer premises equipment.
Cause No. 6 - Channel Unacceptable
This cause indicates that the channel most recently identified is not acceptable to the sending party for use in this call.
Cause No. 7 - call awarded, being delivered in an established channel
This cause indicates that the user has been awarded the incoming call, and that the incoming call is being connected to a channel already established to that user for similar calls (e.g. packet-mode x.25 virtual calls.)
Cause No. 8 - Preemption
This cause indicates the call is being preempted.
Cause No. 9 - Preemption - Circuit reserved For Reuse
This cause indicates that the call is being preempted and the circuit is reserved for reuse by the preempting exchange.
Cause No. 16 - Normal Call Clearing
This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared.
Cause No. 16/4 or 17 - User Busy
This cause is used when the called user has indicated the inability to accept another call. This cause may code may be generated by the called user or by the network. Please note that the use equipment is compatible with the call.
Cause No. 16/3 or 18 - No User Responding
This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated.
Cause No. 19 - No Answer From User (User Alerted)
This cause is used when a user has provided an alerting indication but has not provided a connect indication within a prescribed period of time. Note: This cause is not necessarily generated by the customer premise equipment, but may be generated by internal network timers.
Cause No. 20 - Subscriber Absent
This cause value is used when a mobile station has logged off, radio contact is not obtained with a mobile station or if a personal telecommunication user is temporarily not addressable at any user-network interface.
Cause No. 21 - Call Rejected
This cause indicates that the equipment sending this cause does not wish to accept this call, although it could have accepted the call because the equipment sending this cause is neither busy nor incompatible. This cause may also be generated by the network, indicating that the call was cleared due to a supplementary service constraint. The diagnostic field may contain additional information about the supplementary service and reason for rejection.
Cause No. 22 - Number Changed
This cause is returned to a calling party when the called party number indicated by the calling party is no longer assigned. The new called party number may optionally be included in the diagnostic field. If the network does not support this cause, cause no: 1, unallocated (unassigned) will be used instead.
Cause No. 26 - Non-Selected User Clearing
this cause indicates that the user has not been awarded the incoming call.
Cause No. 27 - Destination Out Of Order
This cause indicates that the destination cannot be reached because the interface to the destination is not functioning correctly. The signaling message was unable to be delivered to a hardware failure.
Cause No. 28 - Invalid Number Format (Address Incomplete)
This cause indicates that the called party cannot be reached because the called party number is not in valid format or is not complete.
Cause No. 29 - Facilities Rejected
This cause is returned when a facility requested by the user cannot be provide by the network.
Cause No. 30 - Response To Status Inquiry
This cause is included in the STATUS message when the reason for generating the STATUS message was the prior receipt of a STATUS INQUIRY.
Cause No. 31 - Normal, Unspecified
This cause is used to report a normal event only when no other cause in the normal class applies.
Cause No. 34 - No Circle/Channel Available
This cause indicates that there is no appropriate circuit/channel presently available to handle the call. Note : If you receive this call, try another data-service, such as dropping from a 64K to 56K data rate.
Cause No. 35 - Call Queued
This cause indicates that the call has been queued for service by the next available device.
Cause No. 38 - Network Out Of Order
This cause indicates that the network is not functioning correctly and that the condition are likely to last a relatively long period of time. A call that is attempted soon afterwards will most likely not connect successfully.
Cause No. 39 - Permanent Frame Mode Connection Out-Of-Service
This cause is included in a STATUS message to indicate that a permanently established frame mode connection is out-of-service
Cause No. 40 - Permanent Frame Mode Connection Operational
This cause is included in a STATUS message to indicate that a permanently established frame mode connection is operational and capable of carrying user information.
Cause No. 41 - Temporary Failure
This indicates that the system is not functioning correctly and that the condition is not likely to last a very long period of time. A call that is attempted almost immediately afterwards will most likely connect successfully.
Cause No. 42 - Switching Equipment Congestion
This cause indicates that the switching equipment generating this cause is experiencing a period of high traffic.
Cause No. 43 - Access Information Discarded
This cause indicates that the network could not deliver access information, low layer compatibility, high layer compatibility, or sub-address as indicated in the diagnostic.
Cause No. 44 - Requested Circuit/Channel Not Available
This cause is returned when the circuit or channel indicated by the requesting entity cannot be provided by the other side of the interface.
Cause No. 46 - Precedence Call Blocked
This indicates that there is no preemptable circuits or that the called user is busy with a call of equal or higher preemptable level.
More will be updated soon....
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