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Versions: 00 01 02 03 04 rfc3372                   Best Current Practice
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        BCP 63
        RFC 3372

        Title:      Session Initiation Protocol (SIP) for Telephones
                    (SIP-T): Context and Architectures
        Author(s):  A. Vemuri, J. Peterson
        Status:     Best Current Practice
        Date:       September 2002
        Mailbox:    Aparna.Vemuri@Qwest.com, jon.peterson@neustar.biz
        Pages:      22
        Characters: 49893
        SeeAlso:    BCP 63

        I-D Tag:    draft-ietf-sipping-sipt-04.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3372.txt


The popularity of gateways that interwork between the PSTN (Public
Switched Telephone Network) and SIP networks has motivated the
publication of a set of common practices that can assure consistent
behavior across implementations.  This document taxonomizes the uses
of PSTN-SIP gateways, provides uses cases, and identifies mechanisms
necessary for interworking.  The mechanisms detail how SIP provides
for both 'encapsulation' (bridging the PSTN signaling across a SIP
network) and 'translation' (gatewaying).

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

This document specifies an Internet Best Current Practices for the
Internet Community, and requests discussion and suggestions for
improvements.  Distribution of this memo is unlimited.

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