RFC 2198 (rfc2198) - Page 1 of 11
RTP Payload for Redundant Audio Data
Alternative Format: Original Text Document
Network Working Group C. Perkins
Request for Comments: 2198 I. Kouvelas
Category: Standards Track O. Hodson
V. Hardman
University College London
M. Handley
ISI
J.C. Bolot
A. Vega-Garcia
S. Fosse-Parisis
INRIA Sophia Antipolis
September 1997
RTP Payload for Redundant Audio Data
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.
Abstract
This document describes a payload format for use with the real-time
transport protocol (RTP), version 2, for encoding redundant audio
data. The primary motivation for the scheme described herein is the
development of audio conferencing tools for use with lossy packet
networks such as the Internet Mbone, although this scheme is not
limited to such applications.
1 Introduction
If multimedia conferencing is to become widely used by the Internet
Mbone community, users must perceive the quality to be sufficiently
good for most applications. We have identified a number of problems
which impair the quality of conferences, the most significant of
which is packet loss. This is a persistent problem, particularly
given the increasing popularity, and therefore increasing load, of
the Internet. The disruption of speech intelligibility even at low
loss rates which is currently experienced may convince a whole
generation of users that multimedia conferencing over the Internet is
not viable. The addition of redundancy to the data stream is offered
as a solution [1]. If a packet is lost then the missing information
may be reconstructed at the receiver from the redundant data that
arrives in the following packet(s), provided that the average number
Perkins, et. al. Standards Track