"The fight against robocalls can even bring telecom rivals together," reports USA Today: AT&T and Comcast said Wednesday that they can authenticate calls made between the two different phone providers' networks, a potential industry first and the latest in the long-running battle against spam calls... The system, which uses a method developed in recent years, verifies that a legitimate call is being made instead of one that has been spoofed by spammers, scammers or robocallers with a "digital signature." The recipient network then confirms the signature on its side. The companies said consumers will get a notification that a call is verified, but exactly what that will look like is not yet known. Both AT&T and Comcast will roll out the system to home phone users later this year at no extra charge. AT&T also said it will introduce the feature to its mobile users this year... Other major wireless and traditional home voice providers have pledged support for the verification method, including Verizon, T-Mobile, Sprint, Charter, Cox and Vonage, with several announcing plans to roll out or test the feature in 2019. The day Comcast and AT&T made their announcement, AT&T's CEO was giving a live interview that was interrupted by a robocall.
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