| 9796 | SIP Call-Info Parameters for Rich Call DataC. Wendt, J. Peterson | Proposed Standard | July 2025 |
| 9248 | Interoperability Profile for Relay User EquipmentB. Rosen | Proposed Standard | June 2022 |
| 8984 | JSCalendar: A JSON Representation of Calendar DataN. Jenkins, R. Stepanek | Proposed Standard | July 2021 |
| 8876 | Non-interactive Emergency CallsB. Rosen, H. Schulzrinne, H. Tschofenig, R. Gellens | Proposed Standard | September 2020 |
| 8621 | The JSON Meta Application Protocol (JMAP) for MailN. Jenkins, C. Newman | Proposed Standard | August 2019 |
| 8262 | Content-ID Header Field in the Session Initiation Protocol (SIP)C. Holmberg, I. Sedlacek | Proposed Standard | October 2017 |
| 8226 | Secure Telephone Identity Credentials: CertificatesJ. Peterson, S. Turner | Proposed Standard | February 2018 |
| 7852 | Additional Data Related to an Emergency CallR. Gellens, B. Rosen, H. Tschofenig, R. Marshall, J. Winterbottom | Proposed Standard | July 2016 |
| 6787 | Media Resource Control Protocol Version 2 (MRCPv2)D. Burnett, S. Shanmugham | Proposed Standard | November 2012 |
| 6772 | Geolocation Policy: A Document Format for Expressing Privacy Preferences for Location InformationH. Schulzrinne, Ed., H. Tschofenig, Ed., J. Cuellar, J. Polk, J. Morris, M. Thomson | Proposed Standard | January 2013 |
| 6442 | Location Conveyance for the Session Initiation ProtocolJ. Polk, B. Rosen, J. Peterson | Proposed Standard | December 2011 |
| 6047 | iCalendar Message-Based Interoperability Protocol (iMIP)A. Melnikov, Ed. | Proposed Standard | December 2010 |
| 5707 | Media Server Markup Language (MSML)A. Saleem, Y. Xin, G. Sharratt | Informational | February 2010 |
| 5621 | Message Body Handling in the Session Initiation Protocol (SIP)G. Camarillo | Proposed Standard | September 2009 |
| 5547 | A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File TransferM. Garcia-Martin, M. Isomaki, G. Camarillo, S. Loreto, P. Kyzivat | Proposed Standard | May 2009 |
| 5545 | Internet Calendaring and Scheduling Core Object Specification (iCalendar)B. Desruisseaux, Ed. | Proposed Standard | September 2009 |
| 5368 | Referring to Multiple Resources in the Session Initiation Protocol (SIP)G. Camarillo, A. Niemi, M. Isomaki, M. Garcia-Martin, H. Khartabil | Proposed Standard | October 2008 |
| 5318 | The Session Initiation Protocol (SIP) P-Refused-URI-List Private-Header (P-Header)J. Hautakorpi, G. Camarillo | Informational | December 2008 |
| 4463 | A Media Resource Control Protocol (MRCP) Developed by Cisco, Nuance, and SpeechworksS. Shanmugham, P. Monaco, B. Eberman | Informational | April 2006 |
| 4227 | Using the Simple Object Access Protocol (SOAP) in Blocks Extensible Exchange Protocol (BEEP)E. O'Tuathail, M. Rose | Proposed Standard | January 2006 |
| 4119 | A Presence-based GEOPRIV Location Object FormatJ. Peterson | Proposed Standard | December 2005 |
| 3795 | Survey of IPv4 Addresses in Currently Deployed IETF Application Area Standards Track and Experimental DocumentsR. Sofia, P. Nesser, II | Informational | June 2004 |
| 3391 | The MIME Application/Vnd.pwg-multiplexed Content-TypeR. Herriot | Informational | December 2002 |
| 3340 | The Application Exchange CoreM. Rose, G. Klyne, D. Crocker | Historic | July 2002 |
| 3288 | Using the Simple Object Access Protocol (SOAP) in Blocks Extensible Exchange Protocol (BEEP)E. O'Tuathail, M. Rose · obsoleted by RFC 4227 | Proposed Standard | June 2002 |