I thought that the new challenge-response systems between providers (shaken-stir?) was supposed to take 99.9% of this. I guess I'm off to see if they have actually fully implemented it between providers.
Edit: looks like summer is the mandated time. From: wikipedia article on Stir/Shaken As of 2019, SHAKEN/STIR is a major ongoing effort in the United States, which is suffering an "epidemic" of robocalls.[1] Both the Canadian Radio-television and Telecommunications Commission and the Federal Communications Commission are requiring use of the protocols by June 30, 2021.[2][3]
Edit: looks like summer is the mandated time. From: wikipedia article on Stir/Shaken As of 2019, SHAKEN/STIR is a major ongoing effort in the United States, which is suffering an "epidemic" of robocalls.[1] Both the Canadian Radio-television and Telecommunications Commission and the Federal Communications Commission are requiring use of the protocols by June 30, 2021.[2][3]