Robocall takedown: AT&T and T-Mobile team up for cross-network call authentication
AT&T and T-Mobile implementations of the SHAKEN/STIR call authentication standard now interoperate, allowing subscribers to see if a caller is coming from a verified subscriber.
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On Wednesday, AT&T and T-Mobile announced that their respective implementations of the SHAKEN/STIR call-origin validation schema now interoperate. This feature allows compatible phones to display a badge in the Dialer app showing a “Caller Verified” message (or similar phrasing) to assure subscribers that an actual person is on the other end, in an attempt to limit the proliferation of robocalls.
With the announcement of this interoperability, the “Caller Verified” message now appears on compatible phones, for calls between AT&T and T-Mobile users.
The standard requires the network operator of the originating call to “sign” the call using a certificate. The network on the receiving end can verify the call by checking the cryptographic signature. Frequently, robocalls rely on Caller ID spoofing, often claiming the originating phone number is from the local area code of the targeted caller to convince victims to answer the call.