Separating interlocutor phenomena from grammatical person

In this paper I argue that not everything that involves speakers or addressees falls under a person system of first, second and third person. Rather, there is an additional grammatical category of interlocutors with the speech-act roles speaker, addressee and outsider. With this knowledge we can make a split in phenomena: spatial deixis (here and there), for example, is a person phenomenon, while the vocative (John in That's great, John) is not a person phenomenon but an interlocutor phenomenon. Furthermore I present the theory that interlocutor phenomena are universal, while person phenomena may differ between languages.