You'll get further not answering in any way than you will blowing whistles, airhorns, firecrackers, gunfire, or anything loud, into the phone. You answered--what their intent is--and they can now pass your number along for money to other scammers. They might not get any personal, or financial information from you, or hijack your computer, but getting any kind of an answer is a win for telepests. Do as you wish, though.

Called 10/17/15 at 10:10 am. Caller ID showed "Sherman Oaks CA". Call answered by Sentry robo call blocker, so did not ring through.

The caller, Van Nuys CA ( displayed as ID on  my c-phone ), 10:30, 10.19.2015. I was with my c-phone. I opted not to answer per FTC suggestion. When I returned the call hiding my home phone number, the number was not in service. The caller used this number & Sherman Oaks CA to call my home phone  10.02.2015
According ttp:800notes.com, the caller started to use this  spoofed number since 08.25.2015.
Caller: Van Nuys CA.

I don't answer them, but I keep getting calls from this number.

Oct 23, 1:49 pm.  Still wish I knew if No mo blocked or not.  This time the caller ID said Sherman Oaks CA.