F-6 User’s Reference Guide
Cause No. 111: protocol error, unspecified. This cause is used to report a protocol error event only when no
other cause in the protocol error class applies.
Cause No. 127: interworking, unspecified. This cause indicates there has been interworking with a network
that does not provide causes for actions it takes; thus, the precise cause for a message being sent cannot be
ascertained.