Re: [AVTCORE] Slight rewording on Selective Forwarding Middlebox

Magnus Westerlund <magnus.westerlund@ericsson.com> Wed, 01 April 2015 10:46 UTC

Return-Path: <magnus.westerlund@ericsson.com>
X-Original-To: avt@ietfa.amsl.com
Delivered-To: avt@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 791E41A009E for <avt@ietfa.amsl.com>; Wed, 1 Apr 2015 03:46:45 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -4.201
X-Spam-Level:
X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001] autolearn=ham
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 Ntxi7fVoj5sb for <avt@ietfa.amsl.com>; Wed, 1 Apr 2015 03:46:44 -0700 (PDT)
Received: from sessmg23.ericsson.net (sessmg23.ericsson.net [193.180.251.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 139941A0049 for <avt@ietf.org>; Wed, 1 Apr 2015 03:46:43 -0700 (PDT)
X-AuditID: c1b4fb2d-f79a46d0000006b4-42-551bcc920f99
Received: from ESESSHC004.ericsson.se (Unknown_Domain [153.88.253.124]) by sessmg23.ericsson.net (Symantec Mail Security) with SMTP id 4A.E2.01716.29CCB155; Wed, 1 Apr 2015 12:46:42 +0200 (CEST)
Received: from [127.0.0.1] (153.88.183.153) by smtp.internal.ericsson.com (153.88.183.32) with Microsoft SMTP Server id 14.3.210.2; Wed, 1 Apr 2015 12:46:41 +0200
Message-ID: <551BCC91.6070200@ericsson.com>
Date: Wed, 01 Apr 2015 12:46:41 +0200
From: Magnus Westerlund <magnus.westerlund@ericsson.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.5.0
MIME-Version: 1.0
To: Roni Even <ron.even.tlv@gmail.com>, avt@ietf.org
References: <55193001.9070009@ericsson.com> <55193770.3000102@ericsson.com> <00b701d06bd6$45896530$d09c2f90$@gmail.com>
In-Reply-To: <00b701d06bd6$45896530$d09c2f90$@gmail.com>
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprKLMWRmVeSWpSXmKPExsUyM+Jvje6kM9KhBjc+SVu87FnJbvG3ndmB yWPnrLvsHkuW/GQKYIrisklJzcksSy3St0vgyjjRlVUwm6PiX/M69gbGG2xdjJwcEgImEq2t ExghbDGJC/fWA8W5OIQEjjJKnJj1nhXCWQbk3LnAAlLFK6At8Wv5IqAqDg4WARWJhyetQcJs AhYSN380gg0VFQiW+Nm+mwmiXFDi5MwnYK0iAmYS686/ArOFBTwltlw9DVYvJFAu0XT+A5jN CTRn54MtjCDjmQU0Jdbv0gcJMwvISzRvnc0MUa4t0dDUwTqBUWAWkg2zEDpmIelYwMi8ilG0 OLW4ODfdyFgvtSgzubg4P08vL7VkEyMwHA9u+a27g3H1a8dDjAIcjEo8vAmd0qFCrIllxZW5 hxilOViUxHntjA+FCAmkJ5akZqemFqQWxReV5qQWH2Jk4uCUamCUW/IjeVr+q6Ta1XfVdGb8 MZd8ILJt4vGpzfG7XPXyjDyXr1LJu95jm36h5NDLKOc/zSnG/I9WiR9/ln21jD3n8gOz1gjb W16PPJe4TJP/Yv7Me77iCZ7IbcaRP/ijJ57m2GuTIn8zTXIVh2xqiXmt84GfR388lneze8Yn Jjet/tuc2KrSB/+UWIozEg21mIuKEwHLzsw9KAIAAA==
Archived-At: <http://mailarchive.ietf.org/arch/msg/avt/JkI0P6BEZ3MdHhHTFdD7ChFfDag>
Subject: Re: [AVTCORE] Slight rewording on Selective Forwarding Middlebox
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.15
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: <http://www.ietf.org/mail-archive/web/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: Wed, 01 Apr 2015 10:46:45 -0000

On 2015-03-31 19:15, Roni Even wrote:
> I am wondering how collisions
> are detected if the SFM uses the same source address for all streams
> he is sending (SSRC multiplexing) 

The reason that having the capability of translating the SSRC values is
desirable is to avoid the SSRC collision issue. If one do not translate
the SSRCs then one need to ensure that any joining endpoint doesn't use
the SSRCs already present in the RTP session, or is forced to change by
sending it the used SSRC. However, the more reliable way is likely
signalling.

Cheers

Magnus Westerlund

----------------------------------------------------------------------
Services, Media and Network features, Ericsson Research EAB/TXM
----------------------------------------------------------------------
Ericsson AB                 | Phone  +46 10 7148287
Färögatan 6                 | Mobile +46 73 0949079
SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com
----------------------------------------------------------------------