| 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 |
| 3428 | Session Initiation Protocol (SIP) Extension for Instant MessagingB. Campbell, Ed., J. Rosenberg, H. Schulzrinne, C. Huitema, D. Gurle | Proposed Standard | December 2002 |
| 3862 | Common Presence and Instant Messaging (CPIM): Message FormatG. Klyne, D. Atkins | Proposed Standard | August 2004 |
| 4103 | RTP Payload for Text ConversationG. Hellstrom, P. Jones | Proposed Standard | June 2005 |
| 4648 | The Base16, Base32, and Base64 Data EncodingsS. Josefsson | Proposed Standard | October 2006 |
| 4975 | The Message Session Relay Protocol (MSRP)B. Campbell, Ed., R. Mahy, Ed., C. Jennings, Ed. | Proposed Standard | September 2007 |
| 5194 | Framework for Real-Time Text over IP Using the Session Initiation Protocol (SIP)A. van Wijk, Ed., G. Gybels, Ed. | Informational | June 2008 |
| 6234 | US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)D. Eastlake 3rd, T. Hansen | Informational | May 2011 |
| 7340 | Secure Telephone Identity Problem Statement and RequirementsJ. Peterson, H. Schulzrinne, H. Tschofenig | Informational | September 2014 |
| 7489 | Domain-based Message Authentication, Reporting, and Conformance (DMARC)M. Kucherawy, Ed., E. Zwicky, Ed. · obsoleted by RFC 9989, RFC 9990, RFC 9991 | Informational | March 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 |
| 8224 | Authenticated Identity Management in the Session Initiation Protocol (SIP)J. Peterson, C. Jennings, E. Rescorla, C. Wendt | Proposed Standard | February 2018 |
| 8225 | PASSporT: Personal Assertion TokenC. Wendt, J. Peterson | Proposed Standard | February 2018 |
| 8226 | Secure Telephone Identity Credentials: CertificatesJ. Peterson, S. Turner | Proposed Standard | February 2018 |
| 8591 | SIP-Based Messaging with S/MIMEB. Campbell, R. Housley | Proposed Standard | April 2019 |
| 8816 | Secure Telephone Identity Revisited (STIR) Out-of-Band Architecture and Use CasesE. Rescorla, J. Peterson | Informational | February 2021 |
| 8862 | Best Practices for Securing RTP Media Signaled with SIPJ. Peterson, R. Barnes, R. Housley | Best Current Practice | January 2021 |
| 8876 | Non-interactive Emergency CallsB. Rosen, H. Schulzrinne, H. Tschofenig, R. Gellens | Proposed Standard | September 2020 |
| 8946 | Personal Assertion Token (PASSporT) Extension for Diverted CallsJ. Peterson | Proposed Standard | February 2021 |