When I get these calls I turn off the voice mail and the ringer and let it ring silently forever. Gives me plenty of time to check the number here and decide if it might be a live person I can mess with or just a robot that needs to be hung up on.
thank you people about blacklisting numbers so the call when comes in... doesn't ring. I don't answer out of state numbers. WARNING they can use your area code when calling from out of state. Pretty Slick TO GET you to answer.
Repetitive calls from this previously Blacklisted number to our DNC registered landline on 12/15/2014 @ 02:33 PM. Ringer was suppressed. Caller ID shows (319) 435-4501.