Just add this to the reject list on your phone. Just hang up on this number or don't bother answering it. These are auto-dial machine calls; they can dial hundreds of phone numbers in an hour and it doesn't cost them a penny. They are finding a number of someone who will pick up the phone. Once you pick up the phone, you've confirmed your number is "live" - expect more calls in the coming months. After that, it takes them a while - hence, that pause with no one answering - before the auto-dialer connects a live person i.e. scammer to talk to you. If all their scammers are busy scamming other people, you may not get a live person to talk to - but don't worry... they will be calling you back.
I wish the phone companies would crack down on these scams but they stand to profit from all the calls - especially calls to cell phones since they're billing you for the minutes your phone rang - even if you don't pick up. Say "bye" to your precious minutes.
And don't give me that "they provide jobs" argument - being in the mafia, robbing or killing people, scamming others etc also provide good paying jobs but they are illegal and unethical. Lots of people have honest paying jobs - why can't these tele-marketers/scammers? Stop annoying families who don't want to buy into your scams.