I dont know about ASA but in WBSF, "any defensive team member in the infield, with or without possession of the ball, may make a verbal appeal." The team coach or manager can also make an appeal, as long as they step into the infield. So my interpretation is that it doesn't matter where you are fielding, as long as you are in the infield when you make the appeal. Furthermore, the notion of "infielder" and "outfielder" is very vague. Again in WBSF, the infield is defined, not very helpfully, as "the area of the field in fair territory normally covered by infielders". An infielder is defined as anyone fielding "anywhere near or within the lines of the base paths forming fair territory", and "A player who normally plays in the outfield may be considered an infielder if they move into the area normally covered by infielders." This also applies, for example, to the infield fly rule. But this way of defining fielders by where they stand is problematic. In co-ed for example you must have 2 of each gender in infield and outfield ... but what if (say) one of your outfielders comes in very short to form a defensive ring along with SS and 2B, or indeed one of your infielders goes out to strengthen the outfield defence? All OK I suppose, though not if those two tactics happen simultaneously, ie the male rover comes in real short, while the female 2B goes out deep.