 Though in most films, phone voices are recorded later, director  Wes Craven (qv) actually had the voice of the killer on set, to  heighten the sense of fear for the actors. According to  Roger L. Jackson (qv), who plays the voice, he was kept on set but  always out of sight from the actors, so they couldnt picture a face  with the voice. He said while watching the monitors, he could see  between takes that Heather Graham (I) (qv) looked a little scared,  whereas Sarah Michelle Gellar (qv) would pick up the phone and  carry on a conversation with him.