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Q.850 description: This cause indicates that the call is being cleared because
one of the users involved in the call has requested that the call be cleared.
Under normal situations, the source of this cause is not the network.
29201 Cause 17, User Busy: The TDM network rejected the call because
the destination number is busy. Error type: BUSY .
Q.850 description: This cause is used to indicate that the called party is unable
to accept another call because the user busy condition has been encountered.
This cause value may be generated by the called user or by the network. In the
case of user determine user busy, it is noted that the user equipment is
compatible with the call.
29202 Cause 18, No answer: Call was not answered. Error type:
NO_ANSWER .
Q.850 description: This cause is used when a called party does not respond to a
call establishment message with either an alerting or connect indication within
the prescribed period of time allocated.
29203 Cause 19, No answer from user (user aler ted): Call was not
answered. Error type: NO_ANSWER .
Q.850 description: This cause is used when the called party has been alerted
but does not respond with a connect indication within a prescribed period of
time.
NOTE – This cause is not necessarily generated by Q.931 procedures but may
be generated by internal network timers.
29204 Cause 20, Subscriber absent: Q.850 description: This cause
value is used when a mobile station has logged off, radio contact is not
obtained with a mobile station or if a personal telecommunication user is
temporarily not addressable at any user- network interface. Error type:
NO_ANSWER .
29205 Cause 21, Call rejected: Q.850 description: 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. The diagnostic field may
contain additional information about the supplementary service and reason for
rejection. Error type:
NON_RETRYABLE .
29206 Cause 22, Number changed: Q.850 description: 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 value,
cause No. 1, Unallocated (unassigned) number, shall be used. Error type:
NON_RETRYABLE .
29207 Cause 23, Redirection to new destination: Q.850 description:
This cause is used by a general ISUP protocol mechanism that can be invoked
by an exchange that decides that the call should be set-up to a different called
number. Such an exchange can invoke a redirection mechanism, by use of this
cause value, to request a preceding exchange involved in the call to route the
call to the new number. Error type:
NON_RETRYABLE .