Can a business rule trigger SMS messages for "ON CALL" technicians

Can a business rule trigger SMS messages for "ON CALL" technicians

We want to be able to set up an On-call schedule that will automatically notify us of an issue.  The only way I've found to do this so far is to set everyone but the on call tech as on leave so that they don't get notified.  The issue we have with this is that it's more difficult to figure out who the person is that should receive messages.  If I could just set a Business Rule to send a notification to a Leave Type, I could leverage that instead.  Any suggestions?
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