This is the Congressional Budget Office Cost Estimate as ordered reported by the Senate Committee on Commerce, Science, and Transportation on December 11, 2019. From the Document: "S. 2204 would require the Federal Communications Commission (FCC) to initiate a rulemaking related to maintaining a list of numbers that may not be blocked by a voice service provider. Such a list could include numbers associated with public safety facilities, government entities, or schools. In addition, the bill would require the FCC to submit to the Congress an analysis of the effectiveness of various tools to block robocalls."
Congressional Budget Office: http://www.cbo.gov/