Actually, if you ask "Is Dr. Smith there?" on a campus, he/she may say
1) Speaking
2) It's he(she).
Most people use the former, but some people use the latter. We cannot ask people not to say "It's he" or "it's she".
1) Speaking
2) It's he(she).
Most people use the former, but some people use the latter. We cannot ask people not to say "It's he" or "it's she".