RFC 5057 on Multiple Dialog Usages in the Session Initiation Protocol

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

        RFC 5057

        Title:      Multiple Dialog Usages in the 
                    Session Initiation Protocol 
        Author:     R. Sparks
        Status:     Informational
        Date:       November 2007
        Mailbox:    RjS@estacado.net
        Pages:      26
        Characters: 62654
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-sipping-dialogusage-06.txt

        URL:        http://www.rfc-editor.org/rfc/rfc5057.txt

Several methods in the Session Initiation Protocol (SIP) can create
an association between endpoints known as a dialog.  Some of these
methods can also create a different, but related, association within
an existing dialog.  These multiple associations, or dialog usages,
require carefully coordinated processing as they have independent
life-cycles, but share common dialog state.  Processing multiple
dialog usages correctly is not completely understood.  What is
understood is difficult to implement.

This memo argues that multiple dialog usages should be avoided.  It
discusses alternatives to their use and clarifies essential behavior
for elements that cannot currently avoid them.

This is an informative document and makes no normative statements of
any kind.  This memo provides information for the Internet community.

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

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It does not specify an Internet standard of any kind. Distribution
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