Sign in
Version 5.3.0, 2014-04-12
Report a bug

Session Initiation Protocol Core (sipcore)

Name: Session Initiation Protocol Core
Area:Real-time Applications and Infrastructure Area (rai)
State: Active
Charter: charter-ietf-sipcore-03 (Approved)
Chairs: Adam Roach <>
Paul Kyzivat <>
Area Director: Richard Barnes <>
Mailing List
To Subscribe:
Jabber Chat
Room Address:

Charter for Working Group

The Session Initiation Protocol Core (SIPCore) working group is
chartered to maintain and continue the development of the core SIP
specifications, currently defined as proposed standard RFCs 3261, 3262,
3263, 3264, and 3265.

The SIPCore working group will concentrate on specifications that
update or replace the core SIP specifications. In this context,
"update" means replacing or modifying protocol elements in the above
listed RFCs in ways that would affect most or all implementations of
those RFCs alone. Extensions to SIP that add new functionality that
would not be required of all implementations will be done outside of
this WG. The process and requirements for such extensions are
documented in RFC 5727, "Change Process for the Session Initiation

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

The primary source of change requirements will be a) interoperability
problems that stem from ambiguous, or under-defined specification,
and b) requirements from other working groups in the RAI Area.

Although in general the WG will not work on extensions to SIP, it
may take on some previous work items from the SIP working group
to allow for a smooth transition. The adoption of new items requires
explicit agreement from the AD or rechartering.


INFO package framework to IESG (PS)
Termination of early dialog prior to final response to IESG (PS)
Invite Transaction Handling Correction to IESG (PS)
Extension for use in etags in conditional notification to IESG (PS)
SIP Events throttling mechanism to IESG (PS)
Presence Scaling Requirements to IESG as Info
Mechanism for indicating support for keep-alives (PS)
Example security flows to IESG (Informational)
Location Conveyance with SIP to IESG (PS)
Error corrections and clarifications to RFC3265 to IESG (PS)
May 2012
WGLC on requirements for a mechanism to indicate proxy capabilities to both endpoints and other proxies in the path of a REGISTER transaction or a dialog-forming transaction.
Jul 2012
Delivering request-URI and parameters to UAS via proxy to IESG (PS)
Dec 2012
Mechanism to indicate proxy capabilities to both endpoints and other intermediaries in the path of a REGISTER transaction or dialog-forming transaction to IESG (PS)
Apr 2013
WebSockets transport definition for SIP to the IESG (proposed standard)

+ 1 new milestone currently in Area Director review.