82 Section 6
6.7ISDN Cause Phrases/Values
When there is an ISDN problem in the network, a phrase appears in the ISDN protocol log that communicates information about the cause of the trouble. See Section 7.10 for how to enable ISDN logging through the Telnet port. These “Cause Values” are numbers generated by the network. When possible, we use those suggested by the Bellcore standard. Note that in some cases there may be more than one meaning. This can frequently be evaluated by whether the message has been received by the calling party or the called party.
CLASS 1.1 (normal)
Cause No. 1 - Check number, redial (unallocated number)
This cause indicates that the called party cannot be reached because, although the called party number is in a valid format, it is not currently allocated (assigned).
Cause No. 2 - No route to network /Prefix 0 dialed in error
This cause indicates that the equipment sending this cause has received a request to route the call through a particular transit network which it does not recognize. The equipment sending this cause does not recognize the transit network either because 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.
or
This cause indicates the prefix 0 is invalid for the entered number
Cause No. 3 - No route to dest./Prefix 1 dialed in error
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
or
A 1 was dialed when not required. Redial without the 1.
Cause No. 4 – No prefix 1/Special Information Tone
The prefix 1 is not required for this number or
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 (National use)
This cause indicates the erroneous inclusion of a trunk prefix in the called party number.
Cause No. 6 – Channel unacceptable
This cause indicates a called user cannot negotiate for a
Cause No. 7 – Call awarded and being delivered on an established channel
This call indicates the user has been awarded the incoming calls, and that call is being connected to a channel already established to that user for similar calls (e.g.
