How to stop telemarketers' calls with concealed caller ID's?

How to stop telemarketers' calls with concealed caller ID's?

• I joined the do-not-call list and I used to be able to report on the donotcall.gov website. But now the ugly marketing companies can hide their caller ID's. When I pick up the phone it's a recorded marketing message. I know there are certain machines that can detect non-human calls, but would the machines screen out those automatic calls from doctor office or library as well?

• Answer:

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