You might be able to handle this with alert escalation.
See page 130 (or 146, depending on if you use the Acrobat page number to jump there, or the printed page number!) of
http://www.solarwinds.com/documentation/Orion/docs/OrionCoreAdministratorGuide.pdf
more thwack related:
Alert Escalation: Using Alerts to Provide Active Network Fault Management
