NoMoRoBo is a way to reduce the number of robot calls. It uses simultaneou s ring to answer the phone , then asks a question which the robot does not understand , and if no answer from the robot , hangs up. So the phone rings once if the call is from a robot.
I have not tried it because Pioneer Telephone is not on their list of comp anies that support simultaneous ring. I called Pioneer and they said they do support simultaneous ring. So sent an email to Nomorobo and hope to be using it soon. Oh yes, it is free.
For more info just goggle on " nomorobo ".
Dan