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Global Call IP Technology Guide — November 2007
Dialogic Corporation
IP-Specific Event Cause Codes
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. This cause is supported on a network-dependent basis.
IPEC_Q931Cause03NoRouteToDestination (0xbbb, 3003 decimal)
Q.931 cause 03 - No route to destination; 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.
IPEC_Q931Cause06ChannelUnacceptable (0xbbe, 3006 decimal)
Q.931 cause 06 - Channel unacceptable; indicates that the channel most recently identified is
not acceptable to the sending entity for use in this call.
IPEC_Q931Cause07CallAwardedAndBeingDeliveredInAnEstablishedChannel (0xbbf, 3007
decimal)
Q.931 cause 07 - Call awarded and being delivered in an established channel; indicates that the
user has been awarded the incoming call, and that the incoming call is being connected to a
channel already established to that user for similar calls (e.g. packet-mode X.25 virtual calls).
IPEC_Q931Cause16NormalCallClearing (0xbc8, 3016 decimal)
Q.931 cause 16 - Normal call clearing; indicates that the call is being cleared because one of
the user’s involved in the call has requested that the call be cleared. Under normal situations,
the source of this cause is not the network.
IPEC_Q931Cause17UserBusy (0xbc9, 3017 decimal)
Q.931 cause 17 - User busy; 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.
IPEC_Q931Cause18NoUserResponding (0xbca, 3018 decimal)
Q.931 cause 18 - No user responding; 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.
IPEC_Q931Cause19UserAlertingNoAnswer (0xbcb, 3019 decimal)
Q.931 cause 19 - No answer from user (user alerted); used when the called party has been
alerted but does not respond with a connect indication within a prescribed period of time. This
cause is not necessarily generated by Q.931 procedures but may be generated by internal
network timers.
IPEC_Q931Cause21CallRejected (0xbcd, 3021 decimal)
Q.931 cause 21 - Call rejected; 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.
IPEC_Q931Cause22NumberChanged (0xbce, 3022 decimal)
Q.931 cause 22 - Number changed; 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 should be used.