Telos Zephyr Xstream - Manual (Page 313)

USER’S MANUAL
Appendix 3 – ISDN Cause Phrases/Values 301
Appendix 3: ISDN Cause Phrases/Values
When there is an ISDN event or problem in the network, a cause code appears on the LCD
screen or ISDN protocol log that communicates information about the cause of the trouble. See
section 12.2 for how to enable ISDN logging through the serial or Telnet port. These “Cause
Values” are numbers generated by the network, which the Xstream 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, or by the ISDN protocol being
used.
We have included the most common cause codes here. For a complete list, see
http://www.telos‐systems.com/techtalk/default.htm .
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 a special information tone should be returned to the calling party.