Section 64.6303 - Caller ID authentication in non-IP networks(a) Except as provided in §§ 64.6304 and 64.6306 , not later than June 30, 2021, a voice service provider shall either: (1) Upgrade its entire network to allow for the initiation, maintenance, and termination of SIP calls and fully implement the STIR/SHAKEN framework as required in § 64.6301 throughout its network; or(2) Maintain and be ready to provide the Commission on request with documented proof that it is participating, either on its own or through a representative, including third party representatives, as a member of a working group, industry standards group, or consortium that is working to develop a non-internet Protocol caller identification authentication solution, or actively testing such a solution.(b) Except as provided in § 64.6304 , not later than June 30, 2023, a gateway provider shall either: (1) Upgrade its entire network to allow for the processing and carrying of SIP calls and fully implement the STIR/SHAKEN framework as required in § 64.6302(c) throughout its network; or(2) Maintain and be ready to provide the Commission on request with documented proof that it is participating, either on its own or through a representative, including third party representatives, as a member of a working group, industry standards group, or consortium that is working to develop a non-internet Protocol caller identification authentication solution, or actively testing such a solution.(c) Except as provided in § 64.6304 , not later than December 31, 2023, a non-gateway intermediate provider receiving a call directly from an originating provider shall either: (1) Upgrade its entire network to allow for the processing and carrying of SIP calls and fully implement the STIR/SHAKEN framework as required in § 64.6302(d) throughout its network; or(2) Maintain and be ready to provide the Commission on request with documented proof that it is participating, either on its own or through a representative, including third party representatives, as a member of a working group, industry standards group, or consortium that is working to develop a non-internet Protocol caller identification authentication solution, or actively testing such a solution. 87 FR 42946 , July 18, 2022, as amended at 87 FR 75944 , Dec. 12, 2022 85 FR 73395 , 12/17/2020; 87 FR 42946 , 9/16/2022; 87 FR 75944 , 1/11/2023; 88 FR 40118 , Not Available ; 88 FR 40118 , 8/21/2023