Besides not answering the calls there are three ways to help with this problem:
If Comcast is your phone provider they have a feature that allows you to block anonymous calls and manually enter up to 25 phone numbers to block.
Nomorobo works pretty good but as noted the phone rings once before being redirected.
If you are using a wireless phone and AT&T is your wireless carrier then download a free app called "AT&T Call Protect".
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