[BCP36]    Best Current Practice 36,
              <https://www.rfc-editor.org/info/bcp36>.
              At the time of writing, this BCP comprises the following:

              Handley, M. and C. Perkins, "Guidelines for Writers of RTP
              Payload Format Specifications", BCP 36, RFC 2736,
              DOI 10.17487/RFC2736, December 1999,
              <https://www.rfc-editor.org/info/rfc2736>.