This happened a few years ago: I decided to call my friend Lydia for a chat. I dialled the number and a female voice (who I didn't recognise) said "hello". I was slightly confused but said "er hello, is Lydia there please?" The female voice sounded even more confused than I and said "erm, sorry, who's calling?". I was rather put out by being asked by this person who I didn't even know who I was but replied "It's Kerry". A short while later, another female voice came on the line and said "Hello, Lydia here".