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

 Charter
 Last Modified: 2006-08-22

 Current Status: Active Working Group

 Chair(s):
     Dean Willis  <dean.willis@softarmor.com>
     Keith Drage  <drage@lucent.com>

 Real-time Applications and Infrastructure Area Director(s):
     Jon Peterson  <jon.peterson@neustar.biz>
     Cullen Jennings  <fluffy@cisco.com>

 Real-time Applications and Infrastructure Area Advisor:
     Cullen Jennings  <fluffy@cisco.com>

 Technical Advisor(s):
     Dan Romascanu  <dromasca@avaya.com>

 Mailing Lists: 
     General Discussion:sip@ietf.org
     To Subscribe:      sip-request@ietf.org
         In Body:       subscribe
     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       Consent-Based Communications WGLC (PS) 

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

   Aug 2006       Mechanism for connected identity to WGLC (PS) 

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

   Aug 2006       Mechanism and guidelines for outbound connections to 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       Certificate Management Service for SIP to WGLC (PS) 

   Sep 2006       Rejecting Anonymous Requests to WGLC (PS) 

   Sep 2006       Session Policies to WGLC as PS 

   Sep 2006       Example security flows to WGLC (Informational) 

   Oct 2006       Consent-Based Communications to IESG (PS) 

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

   Oct 2006       Rejecting Anonymous Requests to IESG (PS) 

   Oct 2006       Mechanism for connected identity to IESG (PS) 

   Oct 2006       Addressing an Amplification Vulnerability in Forking Proxies to 
                IESG (PS) 

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

   Oct 2006       Refering to Multiple Resources to IESG as PS 

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

   Nov 2006       Session Policies to IESG as 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) 

   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       Using SAML for SIP to WGLC (PS) 

   Dec 2007       Using SAML for SIP to IESG (PS) 


 Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Mar 2000 Jun 2006   <draft-ietf-sip-mib-11.txt>
                Management Information Base for the Session Initiation Protocol 
                (SIP) 

Oct 2002 Oct 2005   <draft-ietf-sip-identity-06.txt>
                Enhancements for Authenticated Identity Management in the 
                Session Initiation Protocol (SIP) 

Aug 2003 Aug 2006   <draft-ietf-sip-connect-reuse-06.txt>
                Connection Reuse in the Session Initiation Protocol (SIP) 

Jan 2004 Aug 2006   <draft-ietf-sip-gruu-10.txt>
                Obtaining and Using Globally Routable User Agent (UA) URIs 
                (GRUU) in the Session Initiation Protocol (SIP) 

Jun 2005 Aug 2006   <draft-ietf-sip-location-conveyance-04.txt>
                Session Initiation Protocol Location Conveyance 

Jul 2005 Jun 2006   <draft-ietf-sip-e2m-sec-02.txt>
                End-to-middle Security in the Session Initiation Protocol (SIP) 

Jul 2005 Jun 2006   <draft-ietf-sip-outbound-04.txt>
                Managing Client Initiated Connections in the Session Initiation 
                Protocol (SIP) 

Dec 2005 May 2006   <draft-ietf-sip-answermode-01.txt>
                Requesting Answering Modes for the Session Initiation Protocol 
                (SIP) 

Jan 2006 Aug 2006   <draft-ietf-sip-acr-code-02.txt>
                Rejecting Anonymous Requests in the Session Initiation Protocol 
                (SIP) 

Feb 2006 Jun 2006   <draft-ietf-sip-hop-limit-diagnostics-03.txt>
                Diagnostic Responses for Session Initiation Protocol Hop Limit 
                Errors 

Mar 2006 Sep 2006   <draft-ietf-sip-fork-loop-fix-03.txt>
                Addressing an Amplification Vulnerability in Session Initiation 
                Protocol (SIP) Forking Proxies 

Apr 2006 Aug 2006   <draft-ietf-sip-connected-identity-01.txt>
                Connected Identity in the Session Initiation Protocol (SIP) 

May 2006 Jun 2006   <draft-ietf-sip-sec-flows-01.txt>
                Example call flows using Session Initiation Protocol (SIP) 
                security mechanisms 

May 2006 Jun 2006   <draft-ietf-sip-certs-01.txt>
                Certificate Management Service for The Session Initiation 
                Protocol (SIP) 

Jun 2006 Jun 2006   <draft-ietf-sip-saml-00.txt>
                SIP SAML Profile and Binding 

Jun 2006 Jun 2006   <draft-ietf-sip-hitchhikers-guide-00.txt>
                A Hitchhikers Guide to 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 

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

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

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