100
Invalid information element contents
This cause indicates that the equipment sending this cause has received and information element which it has implemented; however, one or more fields in the I.E. are coded in such a way which has not been implemented by the equipment sending this cause.
101
102
103
Message not compatible with call state
Recovery on timer expiry
Parameter
This cause indicates that a message has been received which is incompatible with the call state.
This cause indicates that a procedure has been initiated by the expiry of a timer in association with error handling procedures.
This cause indicates that the equipment sending this cause has received a message which includes parameters not recognized because the parameters are not defined or are defined but not implemented by the equipment sending this cause. The cause indicates that the parameter(s) were ignored. In addition, if the equipment sending this cause is an intermediate point, then this cause indicates that the parameter(s) were passed unchanged.
110
111
127
Message with unrecognized parameter discarded
Protocol error, unspecified
Interworking, unspecified
This cause indicates that the equipment sending this cause has discarded a received message which includes a parameter that is not recognized.
This cause is used to report a protocol error event only when no other cause in the protocol error class applies.
This cause indicates that an interworking call (usually a call to SW56 service) has ended.