Hi
Would you say that both versions sound OK on the phone?
Alec: Who is this? or Who is that?
James: This is me, James. Don't you recognize my voice?
James: It's me, James. Don't you recognize my voice?
Thanks,
Tom
Mr. Tom Alec: Who is this? or Who is that?
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Mr. TomAlec: Who is this? or Who is that?
Either is acceptable although 'that' is probably more common; most would abbreviate it to 'who's [that / this]?' though.
Mr. TomJames: This is me, James.
Maybe it makes sense technically but it sounds unusual and not at all natural.
Mr. Tom