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Calls between the carriers were authenticated in a March 5 test using a protocol called SHAKEN (Signature-based Handling of Asserted information using toKENs) and STIR (Secure Telephone Identity Revisited), a verification method meant to cut down on spoofed phone numbers.
?For example, a call that is illegally ?spoofed? ? or shows a faked number ? will fail the SHAKEN/STIR Caller ID verification and will not be marked as verified,? according to an AT&T statement. ?By contrast, verification will confirm that a call is really coming from the identified number or entity.?
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