This is an illness my wife has been afflicted with from an early age. There is no cure, no medication will help. There are three options: 1). Uuuhhhhhh . . . 2). Who is this? followed by the inevitable angry retort, Who's THIS? 3). Hang up quickly, less effective these days due to caller ID. Hey, did you just call me and hang up on me? I don't know, who is this?