Telos ZephyrExpress Cause No No far end response, Cause No No answer, Cause No Call rejected

called user or by the network. In the case of user determined user busy it is noted that the user equipment is compatible with the call.

Cause No. 18 - No far end response

This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within a prescribed period of time.

Cause No. 19 - No answer

This cause is used when the called party has been alerted (has provided an alerting indi- cation) but does not respond with a connect indication within a prescribed period.

Cause No. 21 - Call rejected

This cause indicates that the equipment sending this cause does not wish to accept this call, although it could have accepted the call because the equipment sending this cause is neither busy nor incompatible.

This cause may also be generated by the network, indicating that the call was cleared due to a supplementary service constraint.

Cause No. 22 - Number changed

This cause is returned to a calling party when the called party number indicated

by the calling party is no longer assigned, The new called party number may optionally be included in the diagnostic field. If a network does not support this cause, an unas- signed number message (cause number 1) may appear instead.

Cause No. 26 - Non-selected user clearing

This cause indicates the user has not been awarded the incoming call.

Cause No. 27 - Dest. 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.

Cause No. 28 - Incorrect number (Invalid number format, address incomplete)

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.

Cause No. 29 - Facility rejected/Special intercept announcement: undefined code

This cause indicates that the user cannot use this feature

or

This cause value indicates that a user in a special business group (i.e. Centrex) dialed an undefined code

9-20 TROUBLESHOOTING