IETF Logo Mail Archive

Re: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute

Flemming Andreasen <fandreas@cisco.com> Wed, 18 December 2019 03:23 UTC

Return-Path: <fandreas@cisco.com>
X-Original-To: mmusic@ietfa.amsl.com
Delivered-To: mmusic@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B49B6120090 for <mmusic@ietfa.amsl.com>; Tue, 17 Dec 2019 19:23:59 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -14.499
X-Spam-Level:
X-Spam-Status: No, score=-14.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com
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 q4a_VzAIJfDe for <mmusic@ietfa.amsl.com>; Tue, 17 Dec 2019 19:23:58 -0800 (PST)
Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1B889120073 for <mmusic@ietf.org>; Tue, 17 Dec 2019 19:23:58 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=6293; q=dns/txt; s=iport; t=1576639438; x=1577849038; h=subject:to:references:from:message-id:date:mime-version: in-reply-to; bh=jUG7zQpBZ5H2L6skjvKDRwzUdvosGlX1bvTXZSTizSo=; b=hUGlYIe4A5ynpP5mMlkxGRcA84dAgO6cuQ2I9Wya5pyOYucDDlWQHWgY L2PrHL8amphD6Y3CKT+9JXrsUqOdlzkB1LMbwrWTteum6tTqI0w6JtWev D0ShNSm9Q+wYtKpzBJ+fiOtwN0wPp74cbBKZ6GBEgJwNxPJrU//E8wRpI M=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: A0DcAAB5mvld/4wNJK1lDgwBAQEBAQEBAQEDAQEBAREBAQECAgEBAQGBfoIgbFQBMiqEBI8rghGJaok7hiOBZwkBAQEOGAEKDAEBg3tFAoIYJDgTAgMNAQEEAQEBAgEFBG2FNwyFXwEBAQMBASFLGwkCDgoVFQICJzAGAQwGAgEBgx4BglIlD5IJmn91gTKFT4MzgUIGgTaMGBqBQT+BESeCbD6CZAEBgR6BBIJRgl4El1KIFI8fgj6WCgYbjlOLdo5NmnWBaSIqgS5NIxU7gmxQERSWGYUEWSMDMAGPVgEB
X-IronPort-AV: E=Sophos;i="5.69,327,1571702400"; d="scan'208,217";a="686911099"
Received: from alln-core-7.cisco.com ([173.36.13.140]) by rcdn-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 18 Dec 2019 03:23:56 +0000
Received: from [10.118.10.20] (rtp-fandreas-2-8813.cisco.com [10.118.10.20]) by alln-core-7.cisco.com (8.15.2/8.15.2) with ESMTP id xBI3NtEB014225; Wed, 18 Dec 2019 03:23:56 GMT
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, mmusic@ietf.org
References: <DB6PR0701MB24219718E7408022DB6F256493550@DB6PR0701MB2421.eurprd07.prod.outlook.com> <1b757fea-b5ce-c498-8100-cb54a4a431fa@omnitor.se> <5FF684F2-955E-4E52-AED5-69D9EA8D39F5@ericsson.com> <dc08b134-7c31-e466-3fcd-287105c1f455@cisco.com> <9e4f0999-0e06-d60d-c160-d95726288d5e@omnitor.se> <764C4101-0BFC-4379-8AA8-A4437992CB20@ericsson.com> <d5189a45-4398-5a4e-6eb0-ac5ec257b3d0@cisco.com> <bbd6694b-d98d-3e85-7996-cdf90033f3f4@alum.mit.edu> <954EC6EE-3F2A-4BD5-BEEB-7BE920A9DE67@ericsson.com> <8dae9394-635b-e2c7-0a72-8ab399daab4d@alum.mit.edu>
From: Flemming Andreasen <fandreas@cisco.com>
Message-ID: <1e2dad90-10ab-47cc-8c38-06ef7f40d348@cisco.com>
Date: Tue, 17 Dec 2019 22:23:55 -0500
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.3.0
MIME-Version: 1.0
In-Reply-To: <8dae9394-635b-e2c7-0a72-8ab399daab4d@alum.mit.edu>
Content-Type: multipart/alternative; boundary="------------216A2BAE8DD517B81BA8148B"
Content-Language: en-US
X-Outbound-SMTP-Client: 10.118.10.20, rtp-fandreas-2-8813.cisco.com
X-Outbound-Node: alln-core-7.cisco.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/rVNEydyO_Ogd-HAbvV7k3gDeZEI>
Subject: Re: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute
X-BeenThere: mmusic@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Multiparty Multimedia Session Control Working Group <mmusic.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mmusic>, <mailto:mmusic-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mmusic/>
List-Post: <mailto:mmusic@ietf.org>
List-Help: <mailto:mmusic-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mmusic>, <mailto:mmusic-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 18 Dec 2019 03:24:00 -0000


On 12/16/19 11:09 AM, Paul Kyzivat wrote:
> On 12/16/19 11:05 AM, Christer Holmberg wrote:
>> Hi,
>>
>> I'd be ok with the subchannel identifier.
>>
>> I do think it would be good to add some generic text to sdpneg, 
>> though, saying that whenever the media description format or PT 
>> number would normally be used in an attribute (e.g., the fmtp 
>> attribute), when encapsulated in a dcsa attribute the subchannel 
>> identifier is used instead.
>
> +1
Agreed as well.

-- Flemming
>
>> Regards,
>>
>> Christer
>>
>>
>> On 16/12/2019, 17.58, "mmusic on behalf of Paul Kyzivat" 
>> <mmusic-bounces@ietf.org on behalf of pkyzivat@alum.mit.edu> wrote:
>>
>>      On 12/16/19 10:34 AM, Flemming Andreasen wrote:
>>           >> Also, I think we should aim at being aligned with the 
>> RTP usage when it comes to SDP attributes.
>>      > Agreed again. I think the "fmtp" attribute is the right one to 
>> use here
>>      > - the question is simply what format value we use. I'm leaning 
>> towards
>>      > "t140", but we should get some general text in sdpneg to 
>> account for
>>      > additional media formats in the future.
>>           IIUC you are proposing that the format value in fmtp 
>> attributes for data
>>      subchannels should be the subchannel identifier. Is that right?
>>           While that is redundant I won't oppose that.
>>               Thanks,
>>          Paul
>>
>>           _______________________________________________
>>      mmusic mailing list
>>      mmusic@ietf.org
>>      https://www.ietf.org/mailman/listinfo/mmusic
>>
>> _______________________________________________
>> mmusic mailing list
>> mmusic@ietf.org
>> https://www.ietf.org/mailman/listinfo/mmusic
>>
>
> _______________________________________________
> mmusic mailing list
> mmusic@ietf.org
> https://www.ietf.org/mailman/listinfo/mmusic

v2.23.0 | Report a Bug | By Email