Section 64.6301 - Caller ID authentication(a)STIR/SHAKEN implementation by voice service providers. Except as provided in §§ 64.6304 and 64.6306 , not later than June 30, 2021, a voice service provider shall fully implement the STIR/SHAKEN authentication framework in its internet Protocol networks. To fulfill this obligation, a voice service provider shall: (1) Authenticate and verify caller identification information for all SIP calls that exclusively transit its own network;(2) Authenticate caller identification information for all SIP calls it originates and that it will exchange with another voice service provider or intermediate provider and, to the extent technically feasible, transmit that call with authenticated caller identification information to the next voice service provider or intermediate provider in the call path; and(3) Verify caller identification information for all SIP calls it receives from another voice service provider or intermediate provider which it will terminate and for which the caller identification information has been authenticated. 85 FR 22043 , Apr. 21, 2020, as amended at 85 FR 73394 , Nov. 17, 2020 85 FR 22043 , 5/21/2020; 85 FR 73394 , 12/17/2020