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ISDN Information
132
ViewStation User’s Guide
19
No answer from user (user
alerted)
The destination fails to complete the connection within the
prescribed time after responding to the connection request. The
problem occurs at the remote end of the connection.
21 Call rejected
The destination rejects the call for an unknown reason, although
capable of accepting the call.
22 Number changed
No system has been assigned the ISDN number used to set up the
call. (The diagnostic field of the message may return an alternate
address assigned to the called equipment.)
26 Non-selected user clearing
The destination rejected the call, although capable of accepting it,
because the call was not assigned to the user.
27 Destination out of order
A signaling message can not be delivered because the interface is
not functioning correctly, and therefore the destination can not be
reached. This condition might be temporary, though of extended
duration; for instance, remote equipment might be turned off.
28 Invalid number format
Destination address presented in an unrecognizable format or an
incomplete destination address prevented the connection from
being established.
29 Facility rejected The network can not provide facility requested by the user.
30
Response to STATUS
ENQUIRY
The prior receipt of a status inquiry message generated the status
message.
31 Normal, unspecified
A normal has occurred with no standard cause applying. No
resulting action is required.
34
No circuit/channel
available
The call can not be taken because no appropriate channel is
available to establish the connection.
38 Network out of order
The network is not functioning correctly and this condition may
persist for an extended period. The call can not reach the
destination and an immediate attempt to reconnect will probably
fail.
41 Temporary failure
The network is not functioning correctly and an error occurred. The
problem will be resolved shortly.
42
Switching equipment
congestion
The network switching equipment is temporarily overloaded and
the destination can not be reached.
43
Access information
discarded
The requested access information can not be provided by the
network.
44
Requested circuit/channel
not available
An unknown reason prevents the remote equipment from providing
the requested channel. This might be a temporary problem.
47
Resource unavailable,
unspecified
An unknown reason prevents the remote equipment from providing
the requested channel. This might be a temporary problem.
49
Quality of service
unavailable
The network can not provide the requested quality of service (as
defined by CCITT recommendation X.213). This might be a
subscription problem.
50
Requested facility not
subscribed
The remote equipment supports the requested supplementary
service, but only by subscription.
ISDN Errors (Continued)
Code Cause Definition