RFC4091 - The Alternative Network Address Types (ANAT) Semantics for the Session Description Protocol (SDP) Grouping Framework
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日期:2007年5月5日 作者: 查看:[大字体
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Network Working Group G. Camarillo
Request for Comments: 4091 Ericsson
Category: Standards Track J. Rosenberg
Cisco Systems
June 2005
The Alternative Network Address Types (ANAT) Semantics
for the Session Description Protocol (SDP) Grouping Framework
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 defines the Alternative Network Address Types (ANAT)
semantics for the Session Description Protocol (SDP) grouping
framework. The ANAT semantics allow alternative types of network
addresses to establish a particular media stream.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Scope and Relation with Interactive Connectivity
Establishment. . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. ANAT Semantics . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Preference . . . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Offer/Answer and ANAT . . . . . . . . . . . . . . . . . . . . 3
6. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
7. Security Considerations . . . . . . . . . . . . . . . . . . . 4
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1. Normative References . . . . . . . . . . . . . . . . . . 5
9.2. Informational References . . . . . . . . . . . . . . . . 5
1. Introduction
A Session Description Protocol (SDP) [2] session description contains
the media parameters to be used in establishing a number of media
streams. For a particular media stream, an SDP session description
contains, among other parameters, the network addresses and the codec
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