Telos TWOx12 - ISDN Cause Phrases;Values

TELOS TWOX12 USER’S MANUAL
TECHNICAL DATA & TROUBLESHOOTING
CHAPTER 8 154
8.7 ISDN 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 7.4.1 for how to
enable ISDN logging through the serial port or Telnet port. These “Cause Values” are
numbers generated by the network, which the TWOx12 translates to the associated phrases.
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 network-dependent basis.
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.