[Sip] RFC 3911 on The Session Initiation Protocol (SIP) "Join" Header

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

        RFC 3911

        Title:      The Session Initiation Protocol (SIP)
                    "Join" Header
        Author(s):  R. Mahy, D. Petrie
        Status:     Standards Track
        Date:       October 2004
        Mailbox:    rohan@airespace.com, dpetrie@pingtel.com
        Pages:      17
        Characters: 35373
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-sip-join-03.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3911.txt

This document defines a new header for use with SIP multi-party
applications and call control.  The Join header is used to logically
join an existing SIP dialog with a new SIP dialog.  This primitive
can be used to enable a variety of features, for example: "Barge-In",
answering-machine-style "Message Screening" and "Call Center
Monitoring".  Note that definition of these example features is
non-normative.

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
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