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Session Initiation Protocol (sip)
(concluded WG)

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Note: The data for concluded WGs is occasionally incorrect.
Group
Name: Session Initiation Protocol
Acronym:sip
Area:Real-time Applications and Infrastructure Area (rai)
State: Concluded
Charter: charter-ietf-sip-04 (Approved)
Personnel
Chairs: Keith Drage <keith.drage@alcatel-lucent.com>
Dean Willis <dean.willis@softarmor.com>
Area Director: ?
Tech Advisor: Dan Romascanu <dromasca@avaya.com>
Mailing List
Address:sip@ietf.org
To Subscribe:sip-request@ietf.org
Archive:http://www.ietf.org/mail-archive/web/sip/

In addition to the charter maintained by the IETF Secretariat, there is additional information about this working group on the Web at: Additional SIP Page

Description of Working Group


The Session Initiation Protocol (SIP) working group is chartered to
maintain and continue the development of SIP, currently specified as
proposed standard RFC 3261, and its family of extensions.

SIP is a text-based protocol, similar to HTTP and SMTP, for
initiating interactive communication sessions between users.
Such sessions include voice, video, chat, interactive games, and
virtual reality. The main tasks of the group involve bringing SIP
from proposed to draft standard and specifying and developing
proposed extensions that arise out of strong requirements. The SIP
working group will concentrate on the specification of SIP and its
extensions, and will not explore the use of SIP for specific
environments or applications. It will, however respond to general-
purpose requirements for changes to SIP provided by other working
groups, including the SIPPING working group, when those
requirements are within the scope and charter of SIP. The process and
requirements for such extensions are documented in RFC 3427, "Change
Process for the Session Initiation Protocol".

Throughout its work, the group will strive to maintain the basic model
and architecture defined by SIP. In particular:

1. Services and features are provided end-to-end whenever possible.

2. Standards-track extensions and new features must be generally
applicable, and not applicable only to a specific set of session types.

3. Simplicity is key.

4. Reuse of existing Internet protocols and architectures and
integrating
with other Internet applications is crucial.

The primary source of change requirements to be considered by the SIP
Working Group is the SIPPING working group, which
analyzes the requirements for application of SIP to several different
tasks, including the tasks of standards-development organizations
that are developing systems based on SIP and that may require changes
or extensions thereto. Additional requirements are produced by the
other IETF working groups that are using SIP, including the SIMPLE WG
(which is using SIP for messaging and presence) and the XCON working
group (which is using SIP for centralized conferencing).

In addition to extending SIP as required to address these externally-
derived requirements, the deliverables of the group include assuring
capable security and privacy mechanisms within SIP and increasing
the stability of the SIP specification.

Specific deliverables toward these goals include:

1. Mechanisms for secure expression of identity in requests and
responses.

2. Mechanism to securely request services delivery by non-terminal
elements ("end-to-middle").

3. Guidelines for use of existing security mechanisms such as TLS,
IPsec, and certificates.

4. Guidelines for the use of descriptive techniques such as SAML
(Security Association Markup Language) with SIP.

5. Draft standard versions of SIP and critical supporting
specifications.

Other deliverables may be agreed upon as extensions are understood
to be necessary. Prospective deliverables will be discussed
with the Area Director before inclusion on agendas, and new
proposed work must be approved via a charter update.

Goals and Milestones

Done Server Features Negotiation submitted to IESG
Done Complete IESG requested fixes to provrel and servfeat
Done Revised proposed standard version of SIP (2543bis) submitted to IESG
Done SIP Events specification to IESG
Done The UPDATE Method submitted for Proposed Standard
Done SIP extensions for media authorization (call-auth) submitted as Informational
Done Preconditions extensions (manyfolks) spec to IESG
Done SIP Privacy specification to IESG
Done SIP Privacy and Security Requirements to IESG
Done The MESSAGE Method submitted for Proposed Standard
Done The Replaces Header submitted for Proposed Standard
Done Refer spec to IESG
Done SIP NAT extension submitted to IESG
Done SIP over SCTP specification and applicability statement
Done Mechanism for Content Indirection in SIP submitted to IESG for Proposed Standard
Done The SIP Referred-By Header submitted to IESG for Proposed Standard
Done Session Timer spec, revised to IESG
Done Caller preferences specification submitted to IESG
Done Submit SIP Identity documents to IESG for Proposed Standard
Done The SIP Join Header submitted to IESG for Proposed Standard
Done Upgrade S/MIME requirement for AES in 3261 to IESG (PS)
Done Replaces header to IESG (PS)
Done Application Interaction to IESG (BCP)
Done Resource Priority signaling mechanism to IESG (PS)
Done Presence Publication to IESG (PS)
Done Guidelines for Authors of SIP extensions submitted as Informational
Done Enhancements for Authenticated Identity Management to IESG (BCP)
Done MIB spec to IESG
Done Request History mechanism to IESG (PS)
Done Mechanism for REFER without implicit SUBSCRIBE to IESG (PS)
Done Mechanism for Target-Dialog to IESG (PS)
Done Mechanism for feature parameters with REFER To IESG (PS)
Done Mechanism for End-to-Middle Requests to IESG (PS)
Done Consent-Based Communications WGLC (PS)
Done Mechanism for connected identity to WGLC (PS)
Done Certificate Management Service for SIP to WGLC (PS)
Done Rejecting Anonymous Requests to WGLC (PS)
Done Rejecting Anonymous Requests to IESG (PS)
Done Mechanism for connected identity to IESG (PS)
Done Addressing an Amplification Vulnerability in Forking Proxies to IESG (PS)
Done Refering to Multiple Resources to IESG as PS
Done Signaling support for ICE to WGLC (PS)
Done Submit Answering/Alerting Modes to the IESG (PS)
Done Mechanism and guidelines for outbound connections to WGLC (PS)
Done Location Conveyance with SIP to WGLC (PS)
Done Mechanism for obtaining globally routable unique URIs (GRUU) to IESG (PS)
Done Corrections to the SIPS Specification to WGLC (PS)
Done Mechanism and guidelines for outbound connections to IESG (PS)
Done Consent-Based Communications to IESG (PS)
Done Certificate Management Service for SIP to IESG (PS)
Done Signaling support for ICE to IESG (PS)
Done Extensions to SIP UA Profile Delivery Change Notification Event Package for XCAP to WGLC (PS)
Done Connection reuse mechanism to IESG (PS)
Done Session Policies to WGLC as PS
Done Extension for use of etags in conditional notification to WGLC
Done Session Policies to IESG as PS
Done Corrections to the SIPS Specification to IESG (PS)
Done New resource priority namespaces for DISA to WGLC (PS)
Done Requirements for media keying to WGLC (Informational)
Done New resource priority namespaces for DISA to IESG (PS)
Done X.509 Certificates for TLS use in SIP to WGLC (Info)
Done X.509 extended key usage for SIP to WGLC (PS)
Done Requirements for media keying to IESG (Informational)
Done Extensions to SIP UA Profile Delivery Change Notification Event Package for XCAP to IESG (PS)
Done Roadmap for SIP to WGLC (Informational)
Done Roadmap for SIP to IESG (Informational)
Dec 2007 Extension for use in etags in conditional notification to IESG (PS)
Done Establishment of secure media sessions using DTLS-SRTP to WGLC (PS)
Done MIME body handling in SIP to WGLC (PS)
Done Establishment of secure media sessions using DTLS-SRTP to IESG (PS)
Done Guidelines for double route recording to WGLC (BCP)
Aug 2008 Guidelines for double route recording to IESG (BCP)
Sep 2008 X.509 Certificates for TLS use in SIP to IESG (PS)
Sep 2008 X.509 extended key usage for SIP to IESG (PS)
Done Termination of early dialog prior to final response to WGLC (PS)
Done Using SAML for SIP to WGLC (Exp)
Nov 2008 Termination of early dialog prior to final response to IESG (PS)
Dec 2008 Location Conveyance with SIP to IESG (PS)
Dec 2008 Using SAML for SIP to IESG (Exp)
Dec 2008 Delivering request-URI and parameters to UAS via proxy to WGLC (PS)
Jan 2009 MIME body handling in SIP to IESG (PS)
Feb 2009 Delivering request-URI and parameters to UAS via proxy to IESG (PS)
Done Mechanisms for UA initiated privacy to WGLC (BCP)
Done INFO package framework to WGLC (PS)
Mar 2009 Example security flows to WGLC (Informational)
Mar 2009 Identify requirements for test matrix to move SIP to Draft Standard
Mar 2009 Revise charter
Mar 2009 Essential corrections to RFC 3261 (1st batch) to IESG (PS)
Apr 2009 Mechanisms for UA initiated privacy to IESG (BCP)
Apr 2009 INFO package framework to IESG (PS)
Jul 2009 Example security flows to IESG (Informational)