§  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.

   (b) [Reserved].

   [ 85 FR 22043 , Apr. 21, 2020, as amended at  85 FR 73394 , Nov. 17, 2020]