How to answer when the other party asks you who you are on the phone (social etiquette)

When making a call, you should first confirm whether the call is correct and say: Hello! If the voice is unfamiliar, ask: Is this your phone number? Then introduce yourself: I am so-and-so, and I want to find so-and-so. If the call is made correctly, the other party will definitely tell me that this is so-and-so’s house. Please wait a moment while I let so-and-so answer the phone.

I have encountered a joke like this. A relative and friend of A, B, came to the house of A. Another relative and friend of A, C, called A to inquire about booking a hotel for a holiday dinner. C got through to A. Home phone number, B answered the phone, B: Hello, C: Hello, who are you? (Because when B heard the voice, it was not that of A), C: Who are you looking for? B: Who are you? C: Who are you looking for? Peng hung up the phone. A's phone rang again, C: Hello, B: Hello, (B heard it was C again), why is it you again? Who are you? (It means who are you? Actually, I didn’t hear C’s voice. If C reported his name, B knows C.) C: Who are you looking for? B: I’m looking for A. C: You should have told me earlier.