This operation allows an NMS to request all of the unacknowledged active alarms and TCAs that are under the control of this EMS (both those raised by the NEs and those raised by the EMS itself). Some alarms may be filtered out (excluded) by specifying their probable causes or severities. 
The result of this operation is independent of the filtering set up by the NMS for the notifications.

Operation Exceptions:
1. NOT_IMPLEMENTED - Raised when the EMS does not support this operation.
2. INTERNAL_ERROR - Raised in case of non-specific EMS internal failure.
