H-6 User’s Reference Guide
Cause No. 100: invalid information element contents. This cause indicates that the equipment sending this cause has received an information element which it has implemented; however, one or more of the fields in the information element are coded in a way that has not been implemented by the equipment sending this cause.
Cause No 101: message not compatible with call state. This cause indicates that a message has been received that is incompatible with the call state.
Cause No. 102: recovery on timer expiry. This cause indicates that a procedure has been initiated by the expiry of a timer in association with Q.931 error handling procedures.
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.