A new Request for Comments is now available in online RFC libraries.

        RFC 3261

        Title:      SIP: Session Initiation Protocol
        Author(s):  J. Rosenberg, H. Schulzrinne, G. Camarillo,
                    A. Johnston, J. Peterson, R. Sparks, M. Handley,
                    E. Schooler
        Status:     Standards Track
        Date:       June 2002
        Mailbox:    jdrosen@dynamicsoft.com,
                    alan.johnston@wcom.com, jon.peterson@neustar.com,
                    rsparks@dynamicsoft.com, mjh@icir.org,
        Pages:      266
        Characters: 647976
        Obsoletes:  2543

        I-D Tag:    draft-ietf-sip-rfc2543bis-09.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3261.txt

This document describes Session Initiation Protocol (SIP), an
application-layer control (signaling) protocol for creating,
modifying, and terminating sessions with one or more
participants.  These sessions include Internet telephone calls,
multimedia distribution, and multimedia conferences.

SIP invitations used to create sessions carry session descriptions
that allow participants to agree on a set of compatible media types.
SIP makes use of elements called proxy servers to help route requests
to the user's current location, authenticate and authorize users for
services, implement provider call-routing policies, and provide
features to users.  SIP also provides a registration function that
allows users to upload their current locations for use by proxy
servers.  SIP runs on top of several different transport protocols.

This document is a product of the Session Initiation Protocol Working
Group of the IETF.

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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