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Grouping of Media Lines in the Session Description Protocol (SDP) (RFC3388)

IP.com Disclosure Number: IPCOM000010588D
Original Publication Date: 2002-Dec-01
Included in the Prior Art Database: 2002-Dec-20
Document File: 22 page(s) / 40K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Camarillo: AUTHOR [+4]

Abstract

This document defines two Session Description Protocol (SDP) attributes: "group" and "mid". They allow to group together several "m" lines for two different purposes: for lip synchronization and for receiving media from a single flow (several media streams) that are encoded in different formats during a particular session, on different ports and host interfaces.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 7% of the total text.

Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � G. Camarillo

Request for Comments: 3388� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � G. Eriksson

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � J. Holler

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Ericsson

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � H. Schulzrinne

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Columbia University

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � December 2002

� � Grouping of Media Lines in the Session Description Protocol (SDP)

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 (2002).� All Rights Reserved.

Abstract

� � This document defines two Session Description Protocol (SDP)

� � attributes: "group" and "mid".� They allow to group together several

� � "m" lines for two different purposes: for lip synchronization and for

� � receiving media from a single flow (several media streams) that are

� � encoded in different formats during a particular session, on

� � different ports and host interfaces.

Table of Contents

� � 1. Introduction..................................................� 2

� � 2. Terminology...................................................� 2

� � 3. Media Stream Identification Attribute.........................� 3

� � 4. Group Attribute...............................................� 3

� � 5. Use of "group" and "mid"......................................� 3

� � 6. Lip Synchronization (LS)......................................� 4

� � � � � 6.1 Example of LS.............................................� 5

� � 7. Flow Identification (FID).....................................� 5

� � � � � 7.1 SIP and Cellular Access...................................� 6

� � � � � 7.2 DTMF Tones................................................� 6

� � � � � 7.3 Media Flow Definition..................................... � 6

� � � � � 7.4 FID Semantics.............................................� 7

� � � � � � � � � 7.4.1 Examples of FID.....................................� 8

� � � � � 7.5 Scenarios that FID does not Cover........................� 11

Camarillo et. al.� � � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3388� � � � � � � � � � � � Grouping of Media Lin...