Don,
I don't know if you have ever had a problem of answering the phone and there was no one there, but I found out a reason behind it--
It seems the telemarketing firms have done research that has shown them that someone will answer something like 1 in 3 calls they make. So, their automated dialing machines will dial three phone numbers at once, gambling that one person out of the three will pick up the phone, just as their research dictates. Every great once in a while, two people will pick up the phone at the same time, so while the are giving their sales pitch to the one person, the other person picks up the phone and no one is there. I pick up the phone and say "hello" and no one is there. I thought that was interesting when it was explained to me.