Works everywhere all the time. It is common sense but people are so nervous and insecure especially in sales that they believe talking would somehow build credibility. To be more effective they have to listen with a clear intent on addressing what is going on in the speakers mind / life so they can provide an apt solution.
I agree- I always keep this in mind when I am doing interviews. Its the interviewees that keep talking and talking about everything they have done that I lose interest in! Its the ones who ask me the questions and listen that I have interest.