Session Initiation Protocol (sip)

Session Initiation Protocol (sip)
---------------------------------

Charter
Last Modified: 2007-04-24

Current Status: Active Working Group

Chair(s):
Dean Willis <[email protected]>
Keith Drage <[email protected]>

Real-time Applications and Infrastructure Area Director(s):
Jon Peterson <[email protected]>
Cullen Jennings <[email protected]>

Real-time Applications and Infrastructure Area Advisor:
Cullen Jennings <[email protected]>

Technical Advisor(s):
Dan Romascanu <[email protected]>

Mailing Lists:
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Archive: http://www.ietf.org/mail-archive/web/sip/index.html

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 Replaces header to IESG (PS)

Done Upgrade S/MIME requirement for AES in 3261 to IESG (PS)

Done Application Interaction to IESG (BCP)

Done Presence Publication to IESG (PS)

Done Resource Priority signaling mechanism 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 obtaining globally routable unique URIs (GRUU) to
IESG (PS)

Done Connection reuse mechanism 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)

Aug 2006 Diagnostic Responses for SIP Errors to WGLC (PS)

Aug 2006 Submit Answering/Alerting Modes to the IESG (PS)

Aug 2006 Mechanism and guidelines for outbound connections to WGLC (PS)

Done Mechanism for connected identity to WGLC (PS)

Done Consent-Based Communications WGLC (PS)

Sep 2006 Mechanism for obtaining globally routable unique URIs (GRUU) to
IESG (PS)

Sep 2006 Mechanism and guidelines for outbound connections to IESG (PS)

Sep 2006 Location Conveyance with SIP to WGLC (PS)

Sep 2006 Example security flows to WGLC (Informational)

Done Rejecting Anonymous Requests to WGLC (PS)

Done Certificate Management Service for SIP to WGLC (PS)

Oct 2006 Consent-Based Communications to IESG (PS)

Oct 2006 Diagnostic Responses for SIP Errors to IESG (PS)

Oct 2006 Extensions to SIP UA Profile Delivery Change Notification Event
Package for XCAP to WGLC (PS)

Done Mechanism for connected identity to IESG (PS)

Done Refering to Multiple Resources to IESG as PS

Done Addressing an Amplification Vulnerability in Forking Proxies to
IESG (PS)

Done Rejecting Anonymous Requests to IESG (PS)

Nov 2006 Certificate Management Service for SIP to IESG (PS)

Dec 2006 Extensions to SIP UA Profile Delivery Change Notification Event
Package for XCAP to IESG (PS)

Dec 2006 Location Conveyance with SIP to IESG (PS)

Dec 2006 Example security flows to IESG (Informational)

Dec 2006 Roadmap for SIP to WGLC (Informational)

Done Signaling support for ICE to WGLC (PS)

Jan 2007 Session Policies to WGLC as PS

Jan 2007 Signaling support for ICE to IESG (PS)

Mar 2007 Session Policies to IESG as PS

Mar 2007 Roadmap for SIP to IESG (Informational)

Mar 2007 Guidelines for use of SIP security to WGLC (Informational)

Apr 2007 Connection reuse mechanism to IESG (PS)

Jun 2007 Guidelines for use of SIP security to IESG (Informational)

Jun 2007 Identify requirements for test matrix to move SIP to Draft
Standard

Jun 2007 Revise charter

Sep 2007 Extension for use of etags in conditional notification to WGLC

Sep 2007 Using SAML for SIP to WGLC (PS)

Dec 2007 Using SAML for SIP to IESG (PS)

Dec 2007 Extension for use in etags in conditional notification to IESG
(PS)

Dec 2007 Delivering request-URI and parameters to UAS via proxy to WGLC

Feb 2008 Delivering request-URI and parameters to UAS via proxy to IESG
(PS)

Internet-Drafts:

Posted Revised I-D Title <Filename>
------ ------- --------------------------------------------
Jan 2004 Apr 2007 <draft-ietf-sip-gruu-13.txt>
Obtaining and Using Globally Routable User Agent (UA) URIs
(GRUU) in the Session Initiation Protocol (SIP)

Jun 2005 Feb 2007 <draft-ietf-sip-location-conveyance-07.txt>
Session Initiation Protocol Location Conveyance

Jul 2005 Mar 2007 <draft-ietf-sip-e2m-sec-05.txt>
End-to-middle Security in the Session Initiation Protocol (SIP)

Jul 2005 Mar 2007 <draft-ietf-sip-outbound-08.txt>
Managing Client Initiated Connections in the Session Initiation
Protocol (SIP)

Dec 2005 Mar 2007 <draft-ietf-sip-answermode-02.txt>
Requesting Answering Modes for the Session Initiation Protocol
(SIP)

Jan 2006 Mar 2007 <draft-ietf-sip-acr-code-04.txt>
Rejecting Anonymous Requests in the Session Initiation Protocol
(SIP)

Mar 2006 Mar 2007 <draft-ietf-sip-fork-loop-fix-05.txt>
Addressing an Amplification Vulnerability in Session Initiation
Protocol (SIP) Forking Proxies

Apr 2006 Feb 2007 <draft-ietf-sip-connected-identity-05.txt>
Connected Identity in the Session Initiation Protocol (SIP)

May 2006 Mar 2007 <draft-ietf-sip-certs-03.txt>
Certificate Management Service for The Session Initiation
Protocol (SIP)

Jun 2006 Mar 2007 <draft-ietf-sip-hitchhikers-guide-02.txt>
A Hitchhiker's Guide to the Session Initiation Protocol (SIP)

Sep 2006 Nov 2006 <draft-ietf-sip-consent-framework-01.txt>
A Framework for Consent-Based Communications in the Session
Initiation Protocol (SIP)

Sep 2006 Jan 2007 <draft-ietf-sip-uri-list-subscribe-01.txt>
Subscriptions to Request-Contained Resource Lists in the
Session Initiation Protocol (SIP)

Sep 2006 Jan 2007 <draft-ietf-sip-uri-list-message-01.txt>
Multiple-Recipient MESSAGE Requests in the Session Initiation
Protocol (SIP)

Sep 2006 Jan 2007 <draft-ietf-sip-multiple-refer-01.txt>
Referring to Multiple Resources in the Session Initiation
Protocol (SIP)

Sep 2006 Jan 2007 <draft-ietf-sip-uri-list-conferencing-01.txt>
Conference Establishment Using Request-Contained Lists in the
Session Initiation Protocol (SIP)

Oct 2006 Feb 2007 <draft-ietf-sip-session-policy-framework-01.txt>
A Framework for Session Initiation Protocol (SIP) Session
Policies

Dec 2006 Apr 2007 <draft-ietf-sip-sips-03.txt>
The use of the SIPS URI Scheme in the Session Initiation
Protocol (SIP)

Jan 2007 Mar 2007 <draft-ietf-sip-ice-option-tag-01.txt>
Indicating Support for Interactive Connectivity Establishment
(ICE) in the Session Initiation Protocol (SIP)

Request For Comments:

RFC Stat Published Title
------- -- ----------- ------------------------------------
RFC2976 PS Oct 2000 The SIP INFO Method

RFC3204 PS Dec 2001 MIME media types for ISUP and QSIG Objects

RFC3261 PS Jul 2002 SIP: Session Initiation Protocol

RFC3262 PS Jul 2002 Reliability of Provisional Responses in SIP

RFC3263 PS Jul 2002 SIP: Locating SIP Servers

RFC3265 PS Jul 2002 SIP-Specific Event Notification

RFC3361 PS Aug 2002 DHCP Option for SIP Servers

RFC3310 I Sep 2002 Hypertext Transfer Protocol (HTTP) Digest Authentication
Using Authentication and Key Agreement (AKA)

RFC3311 PS Oct 2002 The Session Initiation Protocol UPDATE Method

RFC3312 PS Oct 2002 Integration of Resource Management and SIP

RFC3420 PS Nov 2002 Internet Media Type message/sipfrag

RFC3325 I Dec 2002 Private Extensions to the Session Initiation Protocol
(SIP) for Asserted Identity within Trusted Networks

RFC3323 PS Dec 2002 A Privacy Mechanism for the Session Initiation Protocol
(SIP)

RFC3428 PS Dec 2002 Session Initiation Protocol Extension for Instant
Messaging

RFC3326 PS Dec 2002 The Reason Header Field for the Session Initiation
Protocol (SIP)

RFC3327 PS Dec 2002 Session Initiation Protocol Extension for Registering
Non-Adjacent Contacts

RFC3329 PS Jan 2003 Security Mechanism Agreement for the Session Initiation
Protocol (SIP) Sessions

RFC3313 I Jan 2003 Private Session Initiation Protocol (SIP)Extensions for
Media Authorization

RFC3486Standard Mar 2003 Compressing the Session Initiation Protocol

RFC3515 PS Apr 2003 The Session Initiation Protocol (SIP) Refer Method

RFC3319 PS Jul 2003 Dynamic Host Configuration Protocol (DHCPv6)Options for
Session Initiation Protocol (SIP) Servers

RFC3581 PS Aug 2003 An Extension to the Session Initiation Protocol (SIP)
for Symmetric Response Routing

RFC3608Standard Oct 2003 Session Initiation Protocol Extension Header Field for
Service Route Discovery During Registration

RFC3853Standard Jul 2004 S/MIME AES Requirement for SIP

RFC3841Standard Aug 2004 Caller Preferences for the Session Initiation Protocol
(SIP)

RFC3840Standard Aug 2004 Indicating User Agent Capabilities in the Session
Initiation Protocol (SIP)

RFC3891Standard Sep 2004 The Session Inititation Protocol (SIP) 'Replaces' Header

RFC3892Standard Sep 2004 The SIP Referred-By Mechanism

RFC3893Standard Sep 2004 SIP Authenticated Identity Body (AIB) Format

RFC3911Standard Nov 2004 The Session Inititation Protocol (SIP) 'Join' Header

RFC3903Standard Nov 2004 An Event State Publication Extension to the Session
Initiation Protocol (SIP)

RFC3969BCP Jan 2005 The Internet Assigned Number Authority (IANA) Universal
Resource Identifier (URI) Parameter Registry for the
Session Initiation Protocol (SIP)

RFC3968BCP Jan 2005 The Internet Assigned Number Authority (IANA) Header
Field Parameter Registry for the Session Initiation
Protocol (SIP)

RFC4032Standard Mar 2005 Update to the Session Initiation Protocol (SIP)
Preconditions Framework

RFC4028Standard May 2005 Session Timers in the Session Initiation Protocol (SIP)

RFC4092Standard Jun 2005 Usage of the Session Description Protocol (SDP)
Alternative Network Address Types (ANAT) Semantics in
the Session Initiation Protocol (SIP)

RFC4168Standard Oct 2005 The Stream Control Transmission Protocol (SCTP) as a
Transport for the Session Initiation Protocol (SIP)

RFC4244Standard Dec 2005 An Extension to the Session Initiation Protocol (SIP)
for Request History Information

RFC4320Standard Jan 2006 Actions Addressing Identified Issues with the Session
Initiation Protocol's (SIP) non-INVITE Transaction

RFC4321 I Jan 2006 Problems identified associated with the Session
Initiation Protocol's (SIP) non-INVITE Transaction

RFC4412 PS Feb 2006 Communications Resource Priority for the Session
Initiation Protocol (SIP)

RFC4488 PS May 2006 Suppression of Session Initiation Protocol (SIP) REFER
Method Implicit Subscription

RFC4508 PS May 2006 Conveying Feature Tags with Session Initiation Protocol
(SIP) REFER Method

RFC4485 I May 2006 Guidelines for Authors of Extensions to the Session
Initiation Protocol (SIP)

RFC4483 PS May 2006 A Mechanism for Content Indirection in Session
Initiation Protocol (SIP) Messages

RFC4538 PS Jun 2006 Request Authorization through Dialog Identification in
the Session Initiation Protocol (SIP)

RFC4474 PS Aug 2006 Enhancements for Authenticated Identity Management in
the Session Initiation Protocol (SIP)

RFC4780 PS May 2007 Management Information Base for the Session Initiation
Protocol (SIP)