[BCP151]   Best Current Practice 151,
              <https://www.rfc-editor.org/info/bcp151>.
              At the time of writing, this BCP comprises the following:

              Groves, C. and Y. Lin, "H.248/MEGACO Registration
              Procedures", BCP 151, RFC 5615, DOI 10.17487/RFC5615,
              August 2009, <https://www.rfc-editor.org/info/rfc5615>.