[BCP228]   Best Current Practice 228,
              <https://www.rfc-editor.org/info/bcp228>.
              At the time of writing, this BCP comprises the following:

              Peterson, J., Barnes, R., and R. Housley, "Best Practices
              for Securing RTP Media Signaled with SIP", BCP 228,
              RFC 8862, DOI 10.17487/RFC8862, January 2021,
              <https://www.rfc-editor.org/info/rfc8862>.