In China people usually say "wei" (hello) first when beginning a telephone conversation. If toi call an old acquaintance and recognize his/her voice, toi may address him/her directly par name. Otherwise, toi have to make clear who the other person is par saying, "Hello! Excuse me. Are toi so-and-so?" ou "Hello! Are toi so-and-so?" instead of saying "I an so-and-so" first. "So-and-so" may be name of a person ou a company.
e.g.
--Wèi, shì lǐ míng ma?
   (Hello! Are toi Li Ming?)
--Duì, shì wǒ. Nǐ shì Qí Qí ma?
   (Yes, I am Li Ming. toi are Qi Qi, aren't you?)
One usually says, "You...