Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-08.txt

Gunnar Hellström <gunnar.hellstrom@ghaccess.se> Sun, 30 August 2020 06:20 UTC

Return-Path: <gunnar.hellstrom@ghaccess.se>
X-Original-To: avt@ietfa.amsl.com
Delivered-To: avt@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8BC613A14B4 for <avt@ietfa.amsl.com>; Sat, 29 Aug 2020 23:20:26 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.847
X-Spam-Level:
X-Spam-Status: No, score=-2.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, NICE_REPLY_A=-0.948, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=egensajt.se
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s6_NVAIZYmMD for <avt@ietfa.amsl.com>; Sat, 29 Aug 2020 23:20:23 -0700 (PDT)
Received: from smtp.egensajt.se (smtp.egensajt.se [194.68.80.251]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C95453A14B8 for <avtcore@ietf.org>; Sat, 29 Aug 2020 23:20:21 -0700 (PDT)
Received: from [192.168.2.136] (h77-53-228-169.cust.a3fiber.se [77.53.228.169]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: gunnar.hellstrom@ghaccess.se) by smtp.egensajt.se (Postfix) with ESMTPSA id 764C32014D for <avtcore@ietf.org>; Sun, 30 Aug 2020 08:20:18 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=egensajt.se; s=dkim; t=1598768418; bh=Zftlx5oV1qnNVl+uBZNzXfZj4UQTZzaWqv05lwytfTo=; h=Subject:From:To:References:Date:In-Reply-To:From; b=VEP826iA1Glur4SycY+Iwq0dRbK0PYccVHm2cStJ/bUFOfJZm7NlQnzSPg59W7Hs3 eGBC/LL00kbjyrYKDpTzh1/nHdIIRSe+1v7oX5TuoCOoj3K5Iose6jBZlexhrrQBQg y6Sd6yyK4CRLQMDthrhFQgJgnsCOlcEiqlb/onK0=
From: =?UTF-8?Q?Gunnar_Hellstr=c3=b6m?= <gunnar.hellstrom@ghaccess.se>
To: avtcore@ietf.org
References: <159725784100.26501.7801603611291404620@ietfa.amsl.com> <cea92434-e74b-2fba-dc29-f1b29f5e22d9@ghaccess.se>
Message-ID: <6cd60502-14bd-6799-fd75-6bf79e64972e@ghaccess.se>
Date: Sun, 30 Aug 2020 08:20:16 +0200
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0
MIME-Version: 1.0
In-Reply-To: <cea92434-e74b-2fba-dc29-f1b29f5e22d9@ghaccess.se>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 8bit
Content-Language: sv
Archived-At: <https://mailarchive.ietf.org/arch/msg/avt/tvg07GUDWw7DzydvWrqX5B1gn1Q>
Subject: Re: [AVTCORE] I-D Action: draft-ietf-avtcore-multi-party-rtt-mix-08.txt
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Audio/Video Transport Core Maintenance <avt.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/avt/>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sun, 30 Aug 2020 06:20:27 -0000

I would appreciate comments and reviews on this draft. Other 
organizations want to refer to it.

After some variations of the method to carry multi-party real-time text 
in the previous versions, we are now back to a simple RFC 4103 and 
single RTP stream solution with source indicated in CSRC of the RTP 
packets. In fact it is the same as in the expired predecessor 
draft-hellstrom-text-conference-04, just more elaborated, with 
negotiation by an SDP attribute and an explicit fallback method for 
cases when the endpoint does not support true multi-party presentation.

This was the way recommended by the avtcore session in IETF 108.

I hope you also find it to be the right way to go.

Regards

Gunnar

--------------------------------
Gunnar Hellström
GHAccess
gunnar.hellstrom@ghaccess.se

Den 2020-08-12 kl. 20:52, skrev Gunnar Hellström:
> A new version of the "RTP-mixer formatting of multi-party Real-time 
> text" is available.
>
> This version moves forward with only two methods for multi-party 
> mixing of RTP transported real-time text.
>
> The major one is RFC 4103 with transmission interval of 100 ms when 
> there is text from more than one source to transmit, and source 
> indicated in the CSRC list.
>
> The second one is the fallback for the situation that the endpoint 
> does not have multi-party capability.
>
> Regards
>
> Gunnar
>
> Den 2020-08-12 kl. 20:44, skrev internet-drafts@ietf.org:
>> A New Internet-Draft is available from the on-line Internet-Drafts 
>> directories.
>> This draft is a work item of the Audio/Video Transport Core 
>> Maintenance WG of the IETF.
>>
>>          Title           : RTP-mixer formatting of multi-party 
>> Real-time text
>>          Author          : Gunnar Hellstrom
>>     Filename        : draft-ietf-avtcore-multi-party-rtt-mix-08.txt
>>     Pages           : 36
>>     Date            : 2020-08-12
>>
>> Abstract:
>>     Real-time text mixers for multi-party sessions need to identify the
>>     source of each transmitted group of text so that the text can be
>>     presented by endpoints in suitable grouping with other text from the
>>     same source.
>>
>>     Regional regulatory requirements specify provision of real-time text
>>     in multi-party calls.  RFC 4103 mixer implementations can use
>>     traditional RTP functions for source identification, but the mixer
>>     source switching performance is limited when using the default
>>     transmission characteristics with redundancy.
>>
>>     Enhancements for RFC 4103 real-time text mixing is provided in this
>>     document, suitable for a centralized conference model that enables
>>     source identification and source switching.  The intended use is for
>>     real-time text mixers and multi-party-aware participant endpoints.
>>     The specified mechanism build on the standard use of the CSRC 
>> list in
>>     the RTP packet for source identification.  The method makes use of
>>     the same "text/red" format as for two-party sessions.
>>
>>     A capability exchange is specified so that it can be verified that a
>>     participant can handle the multi-party coded real-time text stream.
>>     The capability is indicated by use of a media attribute 
>> "rtt-mix-rtp-
>>     mixer".
>>
>>     The document updates RFC 4103[RFC4103]
>>
>>     A specifications of how a mixer can format text for the case when 
>> the
>>     endpoint is not multi-party aware is also provided.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-avtcore-multi-party-rtt-mix/
>>
>> There are also htmlized versions available at:
>> https://tools.ietf.org/html/draft-ietf-avtcore-multi-party-rtt-mix-08
>> https://datatracker.ietf.org/doc/html/draft-ietf-avtcore-multi-party-rtt-mix-08 
>>
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-avtcore-multi-party-rtt-mix-08 
>>
>>
>>
>> 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/
>>
>>
>> _______________________________________________
>> Audio/Video Transport Core Maintenance
>> avt@ietf.org
>> https://www.ietf.org/mailman/listinfo/avt