ISDN Cause Code(21-50)

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.

 

What it means:

This is usually a telco issue. The call never reaches the final destination, which can be caused by a bad switch translation, or a misconfiguration on the equipment being called.

 

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 a network does not support this cause, cause no. 1, unallocated (unassigned) number shall be used.

 

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 indicated by the user cannot be reached because the interface to the destination is not functioning correctly. The term "not functioning correctly" indicates that a signal message was unable to be delivered to the remote party; e.g., a physical layer or data link layer failure at the remote party or user equipment off-line.

 

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 a valid format or is not complete.

 

Cause No. 29 - facilities rejected.

This cause is returned when a supplementary service 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 circuit/channel available.

This cause indicates that there is no appropriate circuit/channel presently available to handle the call.

 

What it means:

There is no place on the Public Telephone network to place the call; the call never gets to its destiation. This is usually a temporary problem.

 

Cause No. 35 - Call Queued.

 

Cause No. 38 - network out of order.

This cause indicates that the network is not functioning correctly and that the condition is likely to last a relatively long period of time e.g., immediately re-attempting the call is not likely to be successful.

 

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 (e.g. due to equipment or section failure)

 

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 cause indicates that the network is not functioning correctly and that the condition is no likely to last a long period of time; e.g., the user may wish to try another call attempt almost immediately.

 

What it means:

This means that there is a temporary failure at the physical layer on the ISDN network. If you remove the ISDN cable from the Netopia, you would see this. It's usually temporary.

 

Cause No. 42 - switching equipment congestion.

This cause indicates that the switching equipment generating this cause is experiencing a period of high traffic.

 

What it means:

Just too much going on at this point on the ISDN network to get the call through to its destination.

 

Cause No. 43 - access information discarded.

This cause indicates that the network could not deliver access information to the remote user as requested. i.e., user-to-user information, low layer compatibility, high layer compatibility or sub-address as indicated in the diagnostic. It is noted that the particular type of access information discarded is optionally included 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 cause indicates that there are no predictable circuits or that the called user is busy with a call of equal or higher preventable level.

 

Cause No. 47 - resource unavailable, unspecified.

This cause is used to report a resource unavailable event only when no other cause in the resource unavailable class applies.

 

Cause No. 49 - Quality of Service not available.

This cause is used to report that the requested Quality of Service, as defined in Recommendation X.213. cannot be provided (e.g., throughput of transit delay cannot be supported).

 

Cause No. 50 - requested facility not subscribed.

This cause indicates that the user has requested a supplementary service which is implemented by the equipment which generated this cause but the user is not authorized to use.

 

What it means:

The switch looks at the number being dialed and thinks it is for another service rather than ISDN. If the phone number is put in the correct format, the call should be placed properly. There are no standards for this, all Telcos have their own system for programming the number formats that the switches will recognize. Some systems want to see 7 digits, some 10, and others 11.