Inasmuch as telephone communication can be considered gra mm atical, it is. I have a couple of suggestions: “Hello. ” “Yes.
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muna tigeressIs this Sir John speaking?Your use of "Sir" gives the impression that John has been given a title such as a knighthood. See the introduction of the article here https://en.wikipedia.org/wiki/Sir Is that what you mean? If not, you should not use the word like that.