[notional]

I'm unsure because I do not answer the calls.

Since I do not live in 470 area code I do not answer calls from there. I've read (unsure the validity) that answering spam calls alone can be used as another data point in phishing.

[gostsamo]

Well, the information that you can gain might be more than what they will gain from you. Options are not to talk and just to check what will be said on the other side. Also, not sure if there is a way to blacklist phone numbers by regex, but it is worth exploring. :)