| 2002, June | SIP: Session Initiation Protocol |
| 2002, June | Support for IPv6 in Session Description Protocol (SDP) |
| 2002, October | Integration of Resource Management and Session Initiation Protocol (SIP) |
| 2002, December | The Reason Header Field for the Session Initiation Protocol (SIP) |
| 2003, January | Security Mechanism Agreement for the Session Initiation Protocol (SIP) |
| 2002, December | Grouping of Media Lines in the Session Description Protocol (SDP) |
| 2002, December | Integrated Services Digital Network (ISDN) User Part (ISUP) to Session Initiation Protocol (SIP) Mapping |
| 2003, February | Compressing the Session Initiation Protocol (SIP) |
| 2003, April | Mapping of Media Streams to Resource Reservation Flows |
| 2003, August | Mapping of Integrated Services Digital Network (ISDN) User Part (ISUP) Overlap Signalling to the Session Initiation Protocol (SIP) |
| 2004, February | Authentication, Authorization, and Accounting Requirements for the Session Initiation Protocol (SIP) |
| 2004, April | Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP) |
| 2004, December | The Early Session Disposition Type for the Session Initiation Protocol (SIP) |
| 2004, December | Early Media and Ringing Tone Generation in the Session Initiation Protocol (SIP) |
| 2004, December | The Internet Assigned Number Authority (IANA) Header Field Parameter Registry for the Session Initiation Protocol (SIP) |
| 2004, December | The Internet Assigned Number Authority (IANA) Uniform Resource Identifier (URI) Parameter Registry for the Session Initiation Protocol (SIP) |
| 2005, March | Update to the Session Initiation Protocol (SIP) Preconditions Framework |
| 2005, June | The Alternative Network Address Types (ANAT) Semantics for the Session Description Protocol (SDP) Grouping Framework |
| 2005, June | Usage of the Session Description Protocol (SDP) Alternative Network Address Types (ANAT) Semantics in the Session Initiation Protocol (SIP) |
| 2005, June | Transcoding Services Invocation in the Session Initiation Protocol (SIP) Using Third Party Call Control (3pcc) |
| 2005, September | TCP-Based Media Transport in the Session Description Protocol (SDP) |
| 2005, October | The Stream Control Transmission Protocol (SCTP) as a Transport for the Session Initiation Protocol (SIP) |
| 2006, April | Requirements for Consent-Based Communications in the Session Initiation Protocol (SIP) |
| 2006, April | The Session Initiation Protocol (SIP) P-User-Database Private-Header (P-Header) |
| 2006, July | Internet Assigned Number Authority (IANA) Registration of the Message Media Feature Tag |
| 2006, August | The Session Description Protocol (SDP) Label Attribute |
| 2006, November | The Binary Floor Control Protocol (BFCP) |
| 2006, November | Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams |
| 2007, February | The Session Description Protocol (SDP) Content Attribute |
| 2007, August | The Session Initiation Protocol (SIP) P-Profile-Key Private Header (P-Header) |
| 2007, September | Connection Establishment in the Binary Floor Control Protocol (BFCP) |
| 2007, December | Applying Signaling Compression (SigComp) to the Session Initiation Protocol (SIP) |
| 2007, September | Security Attacks Found Against the Stream Control Transmission Protocol (SCTP) and Current Countermeasures |
| 2008, December | The Session Initiation Protocol (SIP) P-Refused-URI-List Private-Header (P-Header) |
| 2008, October | A Framework for Consent-Based Communications in the Session Initiation Protocol (SIP) |
| 2008, October | A Document Format for Requesting Consent |
| 2008, October | The Session Initiation Protocol (SIP) Pending Additions Event Package |
| 2008, October | Framework and Security Considerations for Session Initiation Protocol (SIP) URI-List Services |
| 2008, October | Extensible Markup Language (XML) Format Extension for Representing Copy Control Attributes in Resource Lists |
| 2008, October | Multiple-Recipient MESSAGE Requests in the Session Initiation Protocol (SIP) |
| 2008, October | Conference Establishment Using Request-Contained Lists in the Session Initiation Protocol (SIP) |
| 2008, October | Subscriptions to Request-Contained Resource Lists in the Session Initiation Protocol (SIP) |
| 2008, October | Referring to Multiple Resources in the Session Initiation Protocol (SIP) |
| 2008, October | Framework for Transcoding with the Session Initiation Protocol (SIP) |
| 2008, October | The Session Initiation Protocol (SIP) Conference Bridge Transcoding Model |