Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords

Flemming Andreasen <fandreas@cisco.com> Fri, 25 January 2019 14:05 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 25D2A129AB8 for <mmusic@ietfa.amsl.com>; Fri, 25 Jan 2019 06:05:57 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -19.053
X-Spam-Level:
X-Spam-Status: No, score=-19.053 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-4.553, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, 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 KvYftOfOlGiI for <mmusic@ietfa.amsl.com>; Fri, 25 Jan 2019 06:05:55 -0800 (PST)
Received: from alln-iport-7.cisco.com (alln-iport-7.cisco.com [173.37.142.94]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2E8FD128BCC for <mmusic@ietf.org>; Fri, 25 Jan 2019 06:05:55 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8233; q=dns/txt; s=iport; t=1548425155; x=1549634755; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to; bh=JoduJcD1gZZj96se3Jra9H1rxCyN5wfWr/ruittFYDs=; b=AUHPP4nEHkOudoVl215laFZH/btyVLrrI/rLrmazzItlNZ8OelB04FGa w0P2pRr/lQ2FgRFsW1QdMQIn+AbdpK+3ELYzVcDU0VqkzRIyb8+4j2POW BCcoSMLOscEY9lg1FVwVvtdLf5J5wlbG5u9i6JtAQfNZmvsH8thsQph1D 8=;
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AWAABPF0tc/51dJa1kGQEBAQEBAQE?= =?us-ascii?q?BAQEBAQcBAQEBAQGBVAEBAQEBAQsBggNnUAEyJ4QBlBGBYAgliTSIaYdlDSO?= =?us-ascii?q?ESQKDCCI3Bg0BAwEBAgEBAm0cDIVLAQUjVhALGCcDAgJGEQYBDAYCAQGDHgG?= =?us-ascii?q?BdA0PqxGBLx+FJIRoBYxBF4FAP4ERJwyCX4MeAQECAYRnglcCkFw5kSMJhyy?= =?us-ascii?q?KeAYYgWqFNIMVJodOhU2ERoUljA2BXCKBVk0jFYMnix2FXSEDMAEBAYsrAQE?=
X-IronPort-AV: E=Sophos;i="5.56,521,1539648000"; d="scan'208,217";a="230502656"
Received: from rcdn-core-6.cisco.com ([173.37.93.157]) by alln-iport-7.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 25 Jan 2019 14:05:54 +0000
Received: from [10.118.10.18] (rtp-fandreas-2-881-ap.cisco.com [10.118.10.18]) by rcdn-core-6.cisco.com (8.15.2/8.15.2) with ESMTP id x0PE5rwR027329; Fri, 25 Jan 2019 14:05:53 GMT
To: Adam Roach <adam@nostrum.com>, Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, "mmusic@ietf.org" <mmusic@ietf.org>
References: <0454609c-ce69-80d4-93d8-f89bc8ba897e@nostrum.com> <CAD5OKxu1bPDU_snQ=H7RwVgPKW_hKJY1Nj7g82vTpJ+gorPrYQ@mail.gmail.com> <f279e997-0236-b78c-e555-5189d9818ef2@nostrum.com> <9B6124BE-E369-4327-B759-77DB0ED8A484@ericsson.com> <6f42b5c5-72f0-8d6a-c68d-d19da7d94353@cisco.com> <HE1PR07MB3161189A6405D403F433F17293980@HE1PR07MB3161.eurprd07.prod.outlook.com> <CAD5OKxvNYnARbw5yvSHCeQUiSMRxQdMj9h5zUeXj+o3Nd8Kh-g@mail.gmail.com> <3e17ec5d-e6b2-5d38-e206-2ed7b8b9c690@nostrum.com> <CAD5OKxtzxOfE9O-G5tQ1C_sg8LHQBxpNATJi_ee-UVcp0gdb2w@mail.gmail.com> <ab0940dd-9ad0-d012-5530-a6a35dd659e9@nostrum.com> <CAD5OKxtgRZErxSfPOQd1xts4zg+1RWuYFOZSey=HgG-Y9g0Dhw@mail.gmail.com> <b7c0eb29-d11b-1a54-5325-d8fccb1c778d@nostrum.com> <CAD5OKxthX_GVNCchMvovAac9Q_hwLVP2VHudp3QUEZxfzBj5HA@mail.gmail.com> <b5cd275a-1dc7-9729-fea0-e8e2b432f171@nostrum.com>
From: Flemming Andreasen <fandreas@cisco.com>
Message-ID: <f54c5932-7254-151f-a04a-07cb86809fe7@cisco.com>
Date: Fri, 25 Jan 2019 09:05:53 -0500
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.4.0
MIME-Version: 1.0
In-Reply-To: <b5cd275a-1dc7-9729-fea0-e8e2b432f171@nostrum.com>
Content-Type: multipart/alternative; boundary="------------92A10CF8C6936EE1B78F4EB3"
Content-Language: en-US
X-Outbound-SMTP-Client: 10.118.10.18, rtp-fandreas-2-881-ap.cisco.com
X-Outbound-Node: rcdn-core-6.cisco.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/lYslSAkPoMQ3RD0kwpwhQIERe6U>
Subject: Re: [MMUSIC] Please Read and Comment: Re: ICE SDP/JSEP peace accords
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: Fri, 25 Jan 2019 14:05:57 -0000


On 1/22/19 4:42 PM, Adam Roach wrote:
> On 1/22/19 3:40 PM, Roman Shpount wrote:
>> On Tue, Jan 22, 2019 at 4:36 PM Adam Roach <adam@nostrum.com 
>> <mailto:adam@nostrum.com>> wrote:
>>
>>     On 1/22/19 3:33 PM, Roman Shpount wrote:
>>>     On Tue, Jan 22, 2019 at 4:25 PM Adam Roach <adam@nostrum.com
>>>     <mailto:adam@nostrum.com>> wrote:
>>>
>>>         On 1/22/19 3:15 PM, Roman Shpount wrote:
>>>         > The issue is the offer generated when ICE restart is not
>>>         initiated and
>>>         > TCP candidate is currently nominated. TCP candidate is the
>>>         only
>>>         > candidate which is present in both offer and answer. It is
>>>         also the
>>>         > default candidate. No UDP candidate will be added it any
>>>         point during
>>>         > the offer/answer exchange.
>>>
>>>
>>>         This is what I tried to indicate with the use of an
>>>         italicized "always"
>>>         in my previous reply.
>>>
>>>         EVEN IF it is generating an offer when ICE restart is
>>>         initiated and the
>>>         TCP candidate is nominated, Chrome will still always
>>>         (always, always)
>>>         generate an SDP that includes a UDP candidate and use that
>>>         candidate's
>>>         value in the m=/o= lines.
>>>
>>>     Unless I am mistaken, if ICE restart is not initiated, only the
>>>     nominated candidate must be included. No other candidates must
>>>     be present. If Chrome does not follow this, then it is most
>>>     likely not complaint with either ICE or JSEP specifications.
>>
>>
>>     Based on the conversation I had with their engineers, that seems
>>     to be the case.
>>
>>
>> Based on RFC 5245 section 9.1.2.2 
>> (https://tools.ietf.org/html/rfc5245#section-9.1.2.2) this is wrong:
>>
>>     The agent MUST include candidate attributes for candidates
>>     matching the default destination for each component of the media
>>     stream, and MUST NOT include any other candidates.
>>
>
> I'm not disagreeing.
>

So where does this leave us ?

Thanks

-- Flemming

> /a
>