Peterson, J., Jennings, C., and R. Sparks, "Change Process for the Session Initiation Protocol (SIP) and the Real-time Applications and Infrastructure Area", BCP 67, RFC 5727, March 2010. 

Campbell, B., Ed., Cooper, A., and B. Leiba, "DISPATCH-Style Working Groups and the SIP Change Process", BCP 67, RFC 7957, August 2016.

<https://www.rfc-editor.org/info/bcp67>