relevance engine pings a user's instant messaging client, calendar, recent call history, and list of important contacts to automatically determine how calls should be handled or what presence information should be displayed to a potential caller.
A. Stocker, K. Tochtermann, and N. Krasser. WM2009: 5th Conf. on Professional Knowledge Management, page 560-572. Bonn, Gesellschaft für Informatik, (2009)