Telos Zephyr Xstream User Manual page 315

USER'S MANUAL
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 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.
May also indicate local unit has incorrect SPIDs.
Cause No. 28 ‐ Incorrect number (invalid number format, address incomplete)/Special
intercept announcement
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.
or
This cause indicates the user should be returned a Special Intercept Announcement.
Cause No. 31 ‐ Network disconnect (Normal, unspecified)/Special intercept announcement:
Call blocked because of group restrictions
This cause is used to report a normal event only when no other cause in the normal class
applies.
or
This value indicates that a user from outside a basic business group (i.e. Centrex) violated an
access restriction feature
CLASS 1.2 (Resource unavailable)
Cause No. 34 ‐ No circuit available (circuit/channel congestion)
This cause indicates that there is no appropriate circuit/channel presently available to handle
the call.
Cause No. 38 ‐ Net 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.
Appendix 3 – ISDN Cause Phrases/Values 303