For a month, when desperate to know what goes on. I went for a job as a phone sales person. We were given scripts, had to train for free! And got dressed down angrily and loudly when unable to answer a hard question despite being new! Needless to say I left pretty quickly!
The script was on the lines of:
Hello, is that Mr /Mrs (name from phone book)
1. expected response: What are you selling?
A, I'm not selling anything.
they tended to say "Oh! Great..."
We then had to talk about the bathrooms, bedrooms etc. that were being sold of course. The ploy was to put the person off guard. Either just hang up, or see my blog "how to put up with pesky sales people"