The VoIP platform encountered an exception %1 during the call with ID "%2". This exception occurred at the Microsoft Exchange ...

The VoIP platform encountered an exception %1 during the call with ID "%2". This exception occurred at the Microsoft Exchange Speech Engine VoIP platform during an event-based asynchronous operation submitted by the Unified Messaging server. The Unified Messaging server will attempt to recover from this exception. If this warning occurs frequently, contact Microsoft Product Support.