| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2543 | SIP: Session Initiation ProtocolM. Handley, H. Schulzrinne, E. Schooler, J. Rosenberg · obsoleted by RFC 3261, RFC 3262, RFC 3263, RFC 3264, RFC 3265 | Proposed Standard | March 1999 |
| 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 |
| 3264 | An Offer/Answer Model with Session Description Protocol (SDP)J. Rosenberg, H. Schulzrinne | Proposed Standard | July 2002 |
| 3319 | Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) ServersH. Schulzrinne, B. Volz | Proposed Standard | July 2003 |
| 3361 | Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) ServersH. Schulzrinne | Proposed Standard | August 2002 |
| 3484 | Default Address Selection for Internet Protocol version 6 (IPv6)R. Draves · obsoleted by RFC 6724 | Proposed Standard | March 2003 |
| 3550 | RTP: A Transport Protocol for Real-Time ApplicationsH. Schulzrinne, S. Casner, R. Frederick, V. Jacobson | Internet Standard | July 2003 |
| 3725 | Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP)J. Rosenberg, J. Peterson, H. Schulzrinne, G. Camarillo | Best Current Practice | April 2004 |
| 4038 | Application Aspects of IPv6 TransitionM-K. Shin, Ed., Y-G. Hong, J. Hagino, P. Savola, E. M. Castro | Informational | March 2005 |
| 4213 | Basic Transition Mechanisms for IPv6 Hosts and RoutersE. Nordmark, R. Gilligan | Proposed Standard | October 2005 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 4943 | IPv6 Neighbor Discovery On-Link Assumption Considered HarmfulS. Roy, A. Durand, J. Paugh | Informational | September 2007 |
| 5118 | Session Initiation Protocol (SIP) Torture Test Messages for Internet Protocol Version 6 (IPv6)V. Gurbani, C. Boulton, R. Sparks | Informational | February 2008 |
| 5245 | Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer ProtocolsJ. Rosenberg · obsoleted by RFC 8445, RFC 8839 | Proposed Standard | April 2010 |
| 5389 | Session Traversal Utilities for NAT (STUN)J. Rosenberg, R. Mahy, P. Matthews, D. Wing · obsoleted by RFC 8489 | Proposed Standard | October 2008 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5766 | Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)R. Mahy, P. Matthews, J. Rosenberg · obsoleted by RFC 8656 | Proposed Standard | April 2010 |
| 6156 | Traversal Using Relays around NAT (TURN) Extension for IPv6G. Camarillo, O. Novo, S. Perreault, Ed. · obsoleted by RFC 8656 | Proposed Standard | April 2011 |