47 CFR § 64.6303 - Caller ID authentication in non-IP networks.

---
identifier: "/us/cfr/t47/s64.6303"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "47 CFR § 64.6303 - Caller ID authentication in non-IP networks."
title_number: 47
title_name: "Telecommunication"
section_number: "64.6303"
section_name: "Caller ID authentication in non-IP networks."
chapter_name: "FEDERAL COMMUNICATIONS COMMISSION"
subchapter_number: "B"
subchapter_name: "COMMON CARRIER SERVICES"
part_number: "64"
part_name: "MISCELLANEOUS RULES RELATING TO COMMON CARRIERS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "47 U.S.C. 151, 152, 154, 201, 202, 217, 218, 220, 222, 225, 226, 227, 227b, 228, 251(a), 251(e), 254(k), 255, 262, 276, 403(b)(2)(B), (c), 616, 620, 716, 1401-1473, unless otherwise noted; Pub. L. 115-141, Div. P, sec. 503, 132 Stat. 348, 1091; Pub. L. 117-338, 136 Stat. 6156."
regulatory_source: "28 FR 13239, Dec. 5, 1963, unless otherwise noted."
cfr_part: "64"
---


# 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(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.

(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(e) 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; 88 FR 40118, June 21, 2023; 90 FR 40256, Sept. 18, 2025]