US Regulator Demands Companies Take Action to Halt 'Robocalls'

U.S. Federal Communications Commission Chairman Ajit Pai on Monday wrote the chief executives of major telephone service providers and other companies, demanding they launch a system to combat billions of "robocalls" and other nuisance calls received monthly by American consumers.

In May, Pai called on companies to adopt an industry-developed "call authentication system" or standard for the cryptographic signing of telephone calls aimed at ending the use of illegitimate spoofed numbers from the telephone system. Monday's letters seek answers by Nov. 19 on the status of those efforts.

The letters went to 13 companies including AT&T Inc., Verizon Communications Inc., T-Mobile US Inc., Alphabet Inc., Comcast Corp., Cox Communications Inc., Sprint Corp., CenturyLink Inc., Charter Communications Inc. and others.

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