https://www.cnet.com/news/att-and-comcast-say-they-hit-new-milestone-in-fight-against-robocalls/

"While authentication won't solve the problem of unwanted robocalls by itself," the companies said, "it's a key step toward giving customers greater confidence and control over the calls they receive."

This comes after the Federal Communications Commission said carrier companies need to implement robust call authentication systems this year. In February, FCC Chairman Ajit Pai said companies should get the systems installed by the end of 2019 or the FCC will consider "regulatory intervention."