§  64.6302   Caller ID authentication by intermediate providers.

   Not later than June 30, 2021, each intermediate provider shall fully
   implement the STIR/SHAKEN authentication framework in its internet
   Protocol networks. To fulfill this obligation, an intermediate provider
   shall:

   (a) Pass unaltered to the subsequent intermediate provider or voice
   service provider in the call path any authenticated caller
   identification information it receives with a SIP call, subject to the
   following exceptions under which it may remove the authenticated caller
   identification information:

   (1) Where necessary for technical reasons to complete the call; or

   (2) Where the intermediate provider reasonably believes the caller
   identification authentication information presents an imminent threat
   to its network security; and

   (b) Authenticate caller identification information for all calls it
   receives for which the caller identification information has not been
   authenticated and which it will exchange with another provider as a SIP
   call, except that the intermediate provider is excused from such duty
   to authenticate if it:

   (1) Cooperatively participates with the industry traceback consortium;
   and

   (2) Responds fully and in a timely manner to all traceback requests it
   receives from the Commission, law enforcement, and the industry
   traceback consortium regarding calls for which it acts as an
   intermediate provider.

   [ 85 FR 73395 , Nov. 17, 2020]