I also received a call from this number today but did not answer it as I am sick n' tired of receiving all of the calls from the spammers, spoofer's and phishing lowlifes that have nothing better to do with their lives!
Check out the latest issue of AARP magazine - they recommended NOT responding to those calls as you outlined because the 'caller' will then have a record of a real phone number. I'm afraid that they would use the call as a 'respond and sign up for services' type situation [remember when the phone companies were big into 'slamming'?]