FALCOM A2 Series User Manual And Command Reference page 45

FALCOM A2
Cause no 98: "Message not compatible with short message protocol
This cause indicates that the equipment sending this cause has
received a message such that the procedures do not indicate that this is
a permissible message to receive while in the short message transfer
state.
Cause no 99: "Information element non-existent or not implemented"
This cause indicates that the equipment sending this cause has
received a message which includes information elements not
recognised because the information element identifier is not defined or
it is defined but not implemented by the equipment sending the cause.
However, the information element is not required to be present in the
message in order for the equipment sending the cause to process the
message.
Cause no 111: "Protocol error, unspecified"
This cause is used to report a protocol error event only when no other
cause applies.
Cause no 127: "Interworking, unspecified"
This cause indicates that there has been interworking with a network
which does not provide causes for actions it takes; thus, the precise
cause for a message which is being send cannot be ascertained.
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A2MAN.DOC
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08 MARCH 1999
Page 44