Section 67.3 - Incorporation by Reference(a) Certain material is incorporated by reference into this part with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51 . All approved incorporation by reference (IBR) material is available for inspection at the FCC and the National Archives and Records Administration (NARA). Contact the FCC through the Federal Communications Commission's Reference Information Center, phone: (202) 418-0270. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations.html or email fr.inspection@nara.gov. The material may be obtained from the source in the following paragraph of this section.(b) Internet Engineering Task Force (IETF), c/o Association Management Solutions, LLC (AMS) 5177 Brandin Court, Fremont, California 94538, phone (510) 492-4080, Web site at http://ietf.org or directly at https://www.ietf.org/rfc/rfc4103.txt.(1) Request for Comments (RFC) 4103, Real-time Transport Protocol Payload for Text Conversation (2005), IBR approved for § 67.1 . 82 FR 7707 , Jan. 23, 2017, as amended at 85 FR 64408 , Oct. 13, 2020; 88 FR 21445 , Apr. 10, 2023 82 FR 7707 , 1/23/2017; as amended at 85 FR 64408 , 10/13/2020; 88 FR 21445 , 4/10/2023