The following publications are possibly variants of this publication:
- URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)Laura Liess, Roland Jesske, Alan B. Johnston, Dale R. Worley, Paul Kyzivat. rfc, 7462:1-46, March 2015. [doi]
- Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3GPPRoland Jesske, Keith Drage, Christer Holmberg. rfc, 7315:1-43, July 2014. [doi]