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

Adam Roach <adam@nostrum.com> Tue, 22 January 2019 21:25 UTC

Return-Path: <adam@nostrum.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 2ADBC131117 for <mmusic@ietfa.amsl.com>; Tue, 22 Jan 2019 13:25:02 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.68
X-Spam-Level:
X-Spam-Status: No, score=-1.68 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, T_SPF_HELO_PERMERROR=0.01, T_SPF_PERMERROR=0.01] autolearn=no autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=fail (1024-bit key) reason="fail (message has been altered)" header.d=nostrum.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 6Ct1FrTmX3yI for <mmusic@ietfa.amsl.com>; Tue, 22 Jan 2019 13:25:01 -0800 (PST)
Received: from nostrum.com (raven-v6.nostrum.com [IPv6:2001:470:d:1130::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2C817131116 for <mmusic@ietf.org>; Tue, 22 Jan 2019 13:25:01 -0800 (PST)
Received: from Svantevit.roach.at (99-152-146-228.lightspeed.dllstx.sbcglobal.net [99.152.146.228]) (authenticated bits=0) by nostrum.com (8.15.2/8.15.2) with ESMTPSA id x0MLOrm6011631 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Tue, 22 Jan 2019 15:24:54 -0600 (CST) (envelope-from adam@nostrum.com)
DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=nostrum.com; s=default; t=1548192295; bh=6DwZMCgadQmYSMBmPE8gNo5H3QrVnHtvOhLDjuPoXzg=; h=Subject:To:Cc:References:From:Date:In-Reply-To; b=ROPCF0/LG1sQYBQ0tah6G8TNlfFoI/sJTnKTvekdHfR+iIOUEz7St2nRfgbG9/g53 cZ2/ja5+vyfK9LU/c80BYiq+wPVGx7+3HBNX85u4PaehklYRARUNAuaWn9nNAJSxfd waHXMDUuN50UID+QQOlhRGI+YkuFyh08Xk7UbqbI=
X-Authentication-Warning: raven.nostrum.com: Host 99-152-146-228.lightspeed.dllstx.sbcglobal.net [99.152.146.228] claimed to be Svantevit.roach.at
To: Roman Shpount <roman@telurix.com>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, Flemming Andreasen <fandreas@cisco.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>
From: Adam Roach <adam@nostrum.com>
Message-ID: <ab0940dd-9ad0-d012-5530-a6a35dd659e9@nostrum.com>
Date: Tue, 22 Jan 2019 15:24:48 -0600
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:60.0) Gecko/20100101 Thunderbird/60.4.0
MIME-Version: 1.0
In-Reply-To: <CAD5OKxtzxOfE9O-G5tQ1C_sg8LHQBxpNATJi_ee-UVcp0gdb2w@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Transfer-Encoding: 7bit
Content-Language: en-US
Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/gr2K0X7h9wgy7yuYtpfF_Bh711g>
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: Tue, 22 Jan 2019 21:25:02 -0000

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.

/a