| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3262 | Reliability of Provisional Responses in Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne | Proposed Standard | July 2002 |
| 3326 | The Reason Header Field for the Session Initiation Protocol (SIP)H. Schulzrinne, D. Oran, G. Camarillo | Proposed Standard | December 2002 |
| 4103 | RTP Payload for Text ConversationG. Hellstrom, P. Jones | Proposed Standard | June 2005 |
| 4240 | Basic Network Media Services with SIPE. Burger, Ed., J. Van Dyke, A. Spitzer | Informational | December 2005 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 5039 | The Session Initiation Protocol (SIP) and SpamJ. Rosenberg, C. Jennings | Informational | January 2008 |
| 6350 | vCard Format SpecificationS. Perreault | Proposed Standard | August 2011 |
| 6809 | Mechanism to Indicate Support of Features and Capabilities in the Session Initiation Protocol (SIP)C. Holmberg, I. Sedlacek, H. Kaplan | Proposed Standard | November 2012 |
| 7092 | A Taxonomy of Session Initiation Protocol (SIP) Back-to-Back User AgentsH. Kaplan, V. Pascual | Informational | December 2013 |
| 7095 | jCard: The JSON Format for vCardP. Kewisch | Proposed Standard | January 2014 |
| 7340 | Secure Telephone Identity Problem Statement and RequirementsJ. Peterson, H. Schulzrinne, H. Tschofenig | Informational | September 2014 |
| 7515 | JSON Web Signature (JWS)M. Jones, J. Bradley, N. Sakimura | Proposed Standard | May 2015 |
| 7518 | JSON Web Algorithms (JWA)M. Jones | Proposed Standard | May 2015 |
| 7519 | JSON Web Token (JWT)M. Jones, J. Bradley, N. Sakimura | Proposed Standard | May 2015 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8197 | A SIP Response Code for Unwanted CallsH. Schulzrinne | Proposed Standard | July 2017 |
| 8224 | Authenticated Identity Management in the Session Initiation Protocol (SIP)J. Peterson, C. Jennings, E. Rescorla, C. Wendt | Proposed Standard | February 2018 |
| 8259 | The JavaScript Object Notation (JSON) Data Interchange FormatT. Bray, Ed. | Internet Standard | December 2017 |
| 8445 | Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) TraversalA. Keranen, C. Holmberg, J. Rosenberg | Proposed Standard | July 2018 |