IETF Logo Mail Archive

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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 16 December 2019 16:05 UTC

Return-Path: <christer.holmberg@ericsson.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 3446D1200B1 for <mmusic@ietfa.amsl.com>; Mon, 16 Dec 2019 08:05:56 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.002
X-Spam-Level:
X-Spam-Status: No, score=-2.002 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ericsson.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 VVXeHzr8ha7B for <mmusic@ietfa.amsl.com>; Mon, 16 Dec 2019 08:05:54 -0800 (PST)
Received: from EUR03-DB5-obe.outbound.protection.outlook.com (mail-eopbgr40074.outbound.protection.outlook.com [40.107.4.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CF398120020 for <mmusic@ietf.org>; Mon, 16 Dec 2019 08:05:53 -0800 (PST)
ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=G9qSbvtBaO4/MO+bZ1a21Hwwl4N379ySfKY7C394tqMfASoU8D5ECqS0plRXBR69hJwcNkKsD6BqiYcCIRffVgU/M4GPSw+KIuO/6Zwf3MA7DGldIRaasbREByxmjKqMm0ZPh3tPJbVrMuoaW4L7Yxx54EX2RGklRmNGBLPVOeG099+w+1XAMyEY8+1S6Yrx6kq35rXIvI3naM5quuSsvU+pGb6hTzp6zd8aJD8wfwbpLTtx8PQoraUlks/WrW6GY70ofmLeqNSk/6QrnlMXLThrvnWkkYIQiQE6cvrVgfTToc+nYWicL6DFb8M034QMG6kRXyH9KoHR9ZhNgzGwcA==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=NqCtxkBve2G2UvfXgKV8jQR3knE4ZnlU9OC+NVv2yyc=; b=UQg6lzq5dNZw2b0Nol/ZNCBQYJrJGCX7qZ7tO90vzIqzDiWTa+ET6t1w8QSDRzUYFpcCjGa/gCzDvaOk2SP7LSkkAjIQ8xioY6P6Ez4zX5zMiy6Us4qvrNu3g4kXnVaU6liiD9k6Q9L9ZluoAt4uTlO7JSOr9FEGNFrm7dVPK4o9aTuAd2PhWkqPlDPqLZD+Rxnbp1LhD7nd6oVXfGj8WwotS3BftLl6mm3ksz0WF+NzhanyYyfEbRu3M5vNbOZYYJBWCKcERGHZhkePob5+JwSnZ2+lx6gLeoREhQ4BFCyqLOuchFe5Rg6nF5gYQKEuWZyRjHkmQsoEtVR/PjrpTQ==
ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=ericsson.com; dmarc=pass action=none header.from=ericsson.com; dkim=pass header.d=ericsson.com; arc=none
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ericsson.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=NqCtxkBve2G2UvfXgKV8jQR3knE4ZnlU9OC+NVv2yyc=; b=PlbyqhFw6j4SBtWpv8IjLwxXhKHOerwqnAtuv8QRvsJ6Bd4HVDnVKRg2bUjsdvyCVmBpksTGQA5VK+rqsM/JiQL0qbrZmxzysKMW3b0qzMCkcSXYHAyoGfXuOcUOx5r8cSJI/ELk6TLEwD+Ft8/j5mTXJ+W/UC0+lkdIqoWjdJU=
Received: from DB6PR0701MB2421.eurprd07.prod.outlook.com (10.168.73.16) by DB6PR0701MB2311.eurprd07.prod.outlook.com (10.168.74.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2559.12; Mon, 16 Dec 2019 16:05:51 +0000
Received: from DB6PR0701MB2421.eurprd07.prod.outlook.com ([fe80::39bd:a590:dcd9:201e]) by DB6PR0701MB2421.eurprd07.prod.outlook.com ([fe80::39bd:a590:dcd9:201e%10]) with mapi id 15.20.2559.012; Mon, 16 Dec 2019 16:05:51 +0000
From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] T140: Usage of "-"fmt value in dcsa encapsulated fmtp attribute
Thread-Index: AQHVsR/lwYXoivuBwkKJ+MACi8tNi6e36BcAgAAuQACAAGifgIACijaAgAGy/QCAAC4rAIAABnyAgAAj1IA=
Date: Mon, 16 Dec 2019 16:05:51 +0000
Message-ID: <954EC6EE-3F2A-4BD5-BEEB-7BE920A9DE67@ericsson.com>
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>
In-Reply-To: <bbd6694b-d98d-3e85-7996-cdf90033f3f4@alum.mit.edu>
Accept-Language: en-US
Content-Language: en-GB
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
user-agent: Microsoft-MacOutlook/10.1e.0.191013
authentication-results: spf=none (sender IP is ) smtp.mailfrom=christer.holmberg@ericsson.com;
x-originating-ip: [2001:14b8:1829:11:d94d:35dd:76:bc06]
x-ms-publictraffictype: Email
x-ms-office365-filtering-correlation-id: ba96c77b-4c00-48d4-45f2-08d78241d2aa
x-ms-traffictypediagnostic: DB6PR0701MB2311:
x-microsoft-antispam-prvs: <DB6PR0701MB23119F24F6880CD886A2EC3393510@DB6PR0701MB2311.eurprd07.prod.outlook.com>
x-ms-oob-tlc-oobclassifiers: OLM:7691;
x-forefront-prvs: 02530BD3AA
x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(366004)(136003)(39860400002)(396003)(376002)(346002)(199004)(189003)(6506007)(36756003)(86362001)(44832011)(2906002)(2616005)(6486002)(33656002)(6512007)(76116006)(91956017)(66446008)(64756008)(66556008)(66476007)(66946007)(478600001)(8936002)(186003)(5660300002)(71200400001)(110136005)(81156014)(81166006)(966005)(53546011)(316002)(8676002); DIR:OUT; SFP:1101; SCL:1; SRVR:DB6PR0701MB2311; H:DB6PR0701MB2421.eurprd07.prod.outlook.com; FPR:; SPF:None; LANG:en; PTR:InfoNoRecords; A:1; MX:1;
received-spf: None (protection.outlook.com: ericsson.com does not designate permitted sender hosts)
x-ms-exchange-senderadcheck: 1
x-microsoft-antispam: BCL:0;
x-microsoft-antispam-message-info: XxPo+t4I5jlT0FV+wfex1vlyueiVobkA86xH3317si8e9jbvSVhhSdVXQ0oGZSrrrir8Qumcg3z2Yf5nZJkQaFyNaCdMraVzwKcbvupk4xiGyBMWvGeXA1PtOUBFRbKpEsnwwYUOmYuEB2m9zH47+444T62TuOl1ODkDPDkIzVHkJ24nIDUMMm7UyVNJM/QYpo8zhjbRERBWXJ1IShROZ3T/0xqiqPOtC2xOn3LLm+1sClkoIJl7f+ZblzRGNzgwsvjXab62xi0C8TniIaOF8RBc7z4ewaiRVhVDFRxrkJeH73eMoN+J0BSFszsxc+K7ZdK7GCWufp+M1xh3/xZHXyqajtf3lcBuU7yUWSwe8aAacZZ97UIlWK4Db82RKJ4fBOy4ABzhVDsMfhLKTEqLvVba+9HQa9fVxLYBEqzh2EII8eel5nuYbQj8T7Atpt8pDrcg3Rc/OKAM2QJpF3wQuijmyydrTBfYt33NYTT8nfU=
x-ms-exchange-transport-forked: True
Content-Type: text/plain; charset="utf-8"
Content-ID: <E7B88A0B0C82FD4FA3901446AA20111F@eurprd07.prod.outlook.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: ericsson.com
X-MS-Exchange-CrossTenant-Network-Message-Id: ba96c77b-4c00-48d4-45f2-08d78241d2aa
X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Dec 2019 16:05:51.4074 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: 92e84ceb-fbfd-47ab-be52-080c6b87953f
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: 8cJwvGwcrNQvaeZHOwzBOfUjyzdHyzXcBesN5qcqe5UGsn5grDZr3i6h8/3P68xi0LHNR5BN8aQbnVmjyzDh9rktkrk97ArbD+QnEBicuNQ=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB6PR0701MB2311
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/nHYDaAddLucqEMsjclrsxR2A35Y>
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: Mon, 16 Dec 2019 16:05:56 -0000

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.

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

v2.23.0 | Report a Bug | By Email