For security, 'hello' is all that's needed. You can 'field' the call from then on.
Charity callers get a 'not interested, remove my name & number from your list immediately'.
Indian call centre persons' get hung up upon.
Genuine callers make themselves known at outset of call, by saying their name & Company's name.
If it's a relie or friend, I'll recognize their voice anyway!
My very dumb & stupid m/i/l used to answer the phone, not only with her full name, but also her phone number! I pointed out to her, in no uncertain ways, the folly of doing that! It didn't occur to her idiotic brain that the caller ALREADY knew the phone number he/she was dialling!
A phone was my 'tool of trade' so extremely well aquainted with its' foibles!
Indian callers get hung up on.
Oh! Rice, wasn't even a 'double-intend'! In my enthusiasm, I answered 2nd time, not realising I'd ALREADY answered it! Duuuuhhhh........