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Usage of the Session Description Protocol (SDP) Alternative Network Address Types (ANAT) Semantics in the Session Initiation Protocol (SIP) (RFC4092)

IP.com Disclosure Number: IPCOM000125542D
Original Publication Date: 2005-Jun-01
Included in the Prior Art Database: 2005-Jun-07
Document File: 7 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Camarillo: AUTHOR [+2]

Abstract

This document describes how to use the Alternative Network Address Types (ANAT) semantics of the Session Description Protocol (SDP) grouping framework in SIP. In particular, we define the sdp-anat SIP option-tag. This SIP option-tag ensures that SDP session descriptions that use ANAT are only handled by SIP entities with ANAT support. To justify the need for such a SIP option-tag, we describe what could possibly happen if an ANAT-unaware SIP entity tried to handle media lines grouped with ANAT.

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This is the abbreviated version, containing approximately 22% of the total text.

Network Working Group                                       G. Camarillo
Request for Comments: 4092                                      Ericsson
Category: Standards Track                                   J. Rosenberg
                                                           Cisco Systems
                                                               June 2005


            Usage of the Session Description Protocol (SDP)
          Alternative Network Address Types (ANAT) Semantics
                in the Session Initiation Protocol (SIP)

Status of This Memo

   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.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document describes how to use the Alternative Network Address
   Types (ANAT) semantics of the Session Description Protocol (SDP)
   grouping framework in SIP.  In particular, we define the sdp-anat SIP
   option-tag.  This SIP option-tag ensures that SDP session
   descriptions that use ANAT are only handled by SIP entities with ANAT
   support.  To justify the need for such a SIP option-tag, we describe
   what could possibly happen if an ANAT-unaware SIP entity tried to
   handle media lines grouped with ANAT.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  2
   3.  The sdp-anat Option-Tag . . . . . . . . . . . . . . . . . . . . 2
   4.  Backward Compatibility . . . . . . . . . . . . . . . . . . . .  3
       4.1.  Answerer Supports All the Network Types Offered  . . . .  3
       4.2.  Answerer Does Not Support All the Network Types Offered.  3
       4.3.  OPTIONS Requests . . . . . . . . . . . . . . . . . . . .  4
   5.  Option-Tag Usage . . . . . . . . . . . . . . . . . . . . . . .  4
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  4
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  4
   8.  Normative References . . . . . . . . . . . . . . . . . . . . .  5


Camarillo & Rosenberg       Standards Track                     [Page 1]
RFC 4092                   ANAT Usage in SDP                   June 2005


1.  Introduction

   SIP [3] UAs (User Agents) often support different network address
   ty...