in my opinion, i think normal lang na magkaroon ng callsign regardless of ano ba kayo—friends, talking stage, lovers, madali lang mabigyan ng callsign/endearments ang mga tao in general if i were to observe how people around me act nowadays.

pero kung ang point is about sa inyo ng talking stage mo, i think it all boils down kung ano ba ang meaning ng callsign para sa inyo—or if mutual ba ang understanding n'yo or kung pareho ba ang depth ng intention when you pertain to each other gamit ang callsign na 'yun. ultimately, it's up to you and that person to know if you're both comfortable with using callsigns early (?) or if you both need to get to know each other more before endearments. we all have different boundaries and perception naman. may callsigns na pang-friendly lang, may ibang pang-intimate, depending sa tao. :>