Found this guide to stop the EAccessviolation error associated with Windows 2003 server when running Avaya's CallStatus program. A user named cascadia on the http://www.pbxtech.info Forum had this to say and it worked for me:

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There is a very easy fix to this. I was advised to update the server fully with MS patches. Did that, but no help. So I did the following on a hunch and it worked!

My Computer > Properties
Advanced Tab
Performance > Settings
Data Execution Prevention Tab
This is turned on by default with a blank exception list.
Click Add...
Locate your copy of callstatus.exe
Mine was in C:\Program Files\Avaya\IP Office\CallStatus\callstatus.exe
Click Apply > OK > OK

And now you should be able to execute the Call Status monitor and run it like you used to.

Source: http://www.pbxtech.info/showthread.php/3114-EAccessviolation-error