Subject: [MMUSIC] I-D Action: draft-hellstrom-mmusic-multi-party-rtt-01.txt

From: Gunnar Hellström <[email-masked]>
Date: Sun, 23 Feb 2020 20:46:03 +0000

A new version of draft-hellstrom-mmusic-multi-party-rtt is available.

The main changes are that in chapter 4: Coordination of RTP text streams, now the RTP Mixer alternative has a solution proposal, that makes it the recommended proposal for the main use case - a traditional centralized conference.

The capability negotiation alternatives in chapter 7 now has clarifying examples, and a new alternative, an FMTP parameter.   I would like to receive views of preference of these alternatives.

Comments are welcome

Regards

Gunnar

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A New Internet-Draft is available from the on-line Internet-Drafts directories.

Title : Real-time text media handling in multi-party conferences
Author : Gunnar Hellstrom
Filename : draft-hellstrom-mmusic-multi-party-rtt-01.txt
Pages : 38
Date : 2020-02-23

Abstract:
This memo specifies methods for Real-Time Text (RTT) media handling
in multi-party calls. The main solution is to carry Real-Time text
by the RTP protocol in a time-sampled mode according to RFC 4103.
The main solution for centralized multi-party handling of real-time
text is achieved through a media control unit coordinating multiple
RTP text streams into one RTP session.

Identification for the streams are provided through the CSRC lists in
the RTP packets and through the RTCP messages. This mechanism
enables the receiving application to present the received real-time
text medium separated per source, in different ways according to user
preferences. Some presentation related features are also described
explaining suitable variations of transmission and presentation of
text.

Call control features are described for the SIP environment. A
number of alternative methods for providing the multi-party
negotiation, transmission and presentation are discussed and a
recommendation for the main one is provided. Two alternative methods
using a single RTP stream and source identification inline in the
text stream are also described, one of them being provided as a lower
functionality fallback method for endpoints with no multi-party
awareness for RTT.

Brief information is also provided for multi-party RTT in the WebRTC
environment.

EDITOR NOTE: A number of alternatives are specified for discussion.
A decision is needed which alternatives are preferred and then how
the preferred alternatives shall be emphasized.

The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-hellstrom-mmusic-multi-party-rtt/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-hellstrom-mmusic-multi-party-rtt-01
https://datatracker.ietf.org/doc/html/draft-hellstrom-mmusic-multi-party-rtt-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-hellstrom-mmusic-multi-party-rtt-01

Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/

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