Dialogue is a simple Mac application that uses bluetooth to connect your Mac with your phone. It allows you to answer and make normal phone calls over your Mac. It's as simple as that.
D. Walter, L. Schröder, und T. Mossakowski. Algebra and Coalgebra in Computer Science, Volume 3629 von Lecture Notes in Computer Science, Seite 424-438. Springer; Berlin; http://www.springer.de, (2005)