| 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 |
| 3263 | Session Initiation Protocol (SIP): Locating SIP ServersJ. Rosenberg, H. Schulzrinne | Proposed Standard | July 2002 |
| 3265 | Session Initiation Protocol (SIP)-Specific Event NotificationA. B. Roach · obsoleted by RFC 6665 | Proposed Standard | July 2002 |
| 3323 | A Privacy Mechanism for the Session Initiation Protocol (SIP)J. Peterson | Proposed Standard | December 2002 |
| 3327 | Session Initiation Protocol (SIP) Extension Header Field for Registering Non-Adjacent ContactsD. Willis, B. Hoeneisen | Proposed Standard | December 2002 |
| 3361 | Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) ServersH. Schulzrinne | Proposed Standard | August 2002 |
| 3486 | Compressing the Session Initiation Protocol (SIP)G. Camarillo | Proposed Standard | February 2003 |
| 3515 | The Session Initiation Protocol (SIP) Refer MethodR. Sparks | Proposed Standard | April 2003 |
| 3608 | Session Initiation Protocol (SIP) Extension Header Field for Service Route Discovery During RegistrationD. Willis, B. Hoeneisen | Proposed Standard | October 2003 |
| 3680 | A Session Initiation Protocol (SIP) Event Package for RegistrationsJ. Rosenberg | Proposed Standard | March 2004 |
| 3840 | Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, P. Kyzivat | Proposed Standard | August 2004 |
| 3841 | Caller Preferences for the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, P. Kyzivat | Proposed Standard | August 2004 |
| 3891 | The Session Initiation Protocol (SIP) "Replaces" HeaderR. Mahy, B. Biggs, R. Dean | Proposed Standard | September 2004 |
| 3911 | The Session Initiation Protocol (SIP) "Join" HeaderR. Mahy, D. Petrie | Proposed Standard | October 2004 |
| 3966 | The tel URI for Telephone NumbersH. Schulzrinne | Proposed Standard | December 2004 |
| 3968 | The Internet Assigned Number Authority (IANA) Header Field Parameter Registry for the Session Initiation Protocol (SIP)G. Camarillo | Best Current Practice | December 2004 |
| 3969 | The Internet Assigned Number Authority (IANA) Uniform Resource Identifier (URI) Parameter Registry for the Session Initiation Protocol (SIP)G. Camarillo | Best Current Practice | December 2004 |
| 4235 | An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, R. Mahy, Ed. | Proposed Standard | November 2005 |
| 4240 | Basic Network Media Services with SIPE. Burger, Ed., J. Van Dyke, A. Spitzer | Informational | December 2005 |
| 4458 | Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR)C. Jennings, F. Audet, J. Elwell | Informational | April 2006 |
| 4475 | Session Initiation Protocol (SIP) Torture Test MessagesR. Sparks, Ed., A. Hawrylyshen, A. Johnston, J. Rosenberg, H. Schulzrinne | Informational | May 2006 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 4730 | A Session Initiation Protocol (SIP) Event Package for Key Press Stimulus (KPML)E. Burger, M. Dolly | Proposed Standard | November 2006 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5589 | Session Initiation Protocol (SIP) Call Control - TransferR. Sparks, A. Johnston, Ed., D. Petrie | Best Current Practice | June 2009 |
| 5626 | Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)C. Jennings, Ed., R. Mahy, Ed., F. Audet, Ed. | Proposed Standard | October 2009 |
| 5628 | Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)P. Kyzivat | Proposed Standard | October 2009 |