I've been called by them twice.  The first time, I answered "4192 nonsecure, identify and authenticate".  A confused man asked me "Is this Ray?"  I repeat my one line, they hit some buttons on their keypad because I hear the tones.  We go along like that for 5 minutes before he hangs up.  The Indian callers usually give up in 15 seconds, so that person....was really down there.

The second time, I did something far worse.  I had a woman call me, so I turned it into a little naughty time with the phone  "What are you wearing?"  "Oh, that sounds hot, say it again for me."  I was interested to see how far she would take it, and she took it pretty far.  So glad it was on her dime.