The Mediation Server service has encountered a major internal problem that may be causing it to fail calls. Cause: Check ...

The Mediation Server service has encountered a major internal problem that may be causing it to fail calls.

Cause: Check other MOM alerts for more details. CALLS_REJECTED_DUE_TO_LOAD and the LOAD_CALL_FAILURE_INDEX counter are examples of counters that signal overload conditions.  The MEDIATIONSERVER_UNEXPECTED_EXCEPTION (Event ID: 25018) and MEDIATIONSERVER_UNEXPECTED_SIGNALING_EXCEPTION (Event ID: 25027) are examples of events that signal internal error conditions.
Resolution:
If the cause for the alarm is an overload condition, consider deploying additional Mediation Servers in this cluster.  If the cause is due to an unexpected exception, consider restarting the service.