Re: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 05 August 2013 05:13 UTC

Return-Path: <christer.holmberg@ericsson.com>
X-Original-To: stox@ietfa.amsl.com
Delivered-To: stox@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8AA5B11E8138 for <stox@ietfa.amsl.com>; Sun, 4 Aug 2013 22:13:08 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -5.329
X-Spam-Level:
X-Spam-Status: No, score=-5.329 tagged_above=-999 required=5 tests=[AWL=0.050, BAYES_00=-2.599, HELO_EQ_SE=0.35, RCVD_IN_DNSWL_MED=-4, SARE_MLH_Stock1=0.87]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OBNIcR3uK-1z for <stox@ietfa.amsl.com>; Sun, 4 Aug 2013 22:13:03 -0700 (PDT)
Received: from mailgw7.ericsson.se (mailgw7.ericsson.se [193.180.251.48]) by ietfa.amsl.com (Postfix) with ESMTP id F1D8F11E8136 for <stox@ietf.org>; Sun, 4 Aug 2013 22:12:56 -0700 (PDT)
X-AuditID: c1b4fb30-b7ef76d000004bbc-39-51ff345791a9
Received: from ESESSHC014.ericsson.se (Unknown_Domain [153.88.253.125]) by mailgw7.ericsson.se (Symantec Mail Security) with SMTP id ED.C1.19388.7543FF15; Mon, 5 Aug 2013 07:12:55 +0200 (CEST)
Received: from ESESSMB209.ericsson.se ([169.254.9.135]) by ESESSHC014.ericsson.se ([153.88.183.60]) with mapi id 14.02.0328.009; Mon, 5 Aug 2013 07:12:54 +0200
From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Adrian Georgescu <ag@ag-projects.com>
Thread-Topic: VS: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking
Thread-Index: Ac6PaRwphn/mcGjdScuZ2ITH5v377///4akA///dspCAACTvAP/8UCBAgAdFoQD//8jcoAAJ2OIA//8vpmA=
Date: Mon, 5 Aug 2013 05:12:54 +0000
Message-ID: <7594FB04B1934943A5C02806D1A2204B1C41CBAC@ESESSMB209.ericsson.se>
References: <7594FB04B1934943A5C02806D1A2204B1C418E51@ESESSMB209.ericsson.se> <8C703C0F-181C-4E36-8A59-727B45C0A1B5@ag-projects.com> <7594FB04B1934943A5C02806D1A2204B1C418FAC@ESESSMB209.ericsson.se> <B7CBEFB1-2A23-4337-90DD-D8157123A1AD@ag-projects.com> <7594FB04B1934943A5C02806D1A2204B1C41C17E@ESESSMB209.ericsson.se> <6E2B9398-C9C5-47F1-AC5D-2C7E23AB6E69@ag-projects.com> <7594FB04B1934943A5C02806D1A2204B1C41C208@ESESSMB209.ericsson.se> <51FEA128.2060806@ag-projects.com>
In-Reply-To: <51FEA128.2060806@ag-projects.com>
Accept-Language: en-US
Content-Language: fi-FI
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [153.88.183.146]
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrJLMWRmVeSWpSXmKPExsUyM+JvrW64yf9AgxXHJCy23su3+L+jidWB yaOlfxKLx5IlP5kCmKK4bFJSczLLUov07RK4Mt5/nc5UsFixYtfyBawNjG+luhg5OCQETCTu fEzvYuQEMsUkLtxbz9bFyMUhJHCYUeJqxztGCGcxo8TsCc9ZQRrYBCwkuv9pgzSICGhKtCya zAISZhZQljg0RRYkLCzgK7HofBMLREmAxLl5p9kh7CSJr+svMILYLAIqErNmtrGDtPIC1R+8 KQux6SWzxMY5y8FqOAX0Jb40HGcCsRmBbvt+ag2YzSwgLvHh4HVmiJsFJJbsOQ9li0q8fPyP FcJWkvix4RILRL2exI2pU9ggbG2JZQtfg9XzCghKnJz5hGUCo9gsJGNnIWmZhaRlFpKWBYws qxjZcxMzc9LLzTcxAqPj4JbfBjsYN90XO8QozcGiJM67We9MoJBAemJJanZqakFqUXxRaU5q 8SFGJg5OqQbG2Q6e6Qw5tVO/9dbn7BLVE+ycPOXwiZ0hh1fle55OyCvnmX9yf7bV2ry86bxq pzOlVyzudHBvNNo37fRuW12JcxpLMvdErtnzM9tj0ZmLF1uXcLrO0amXemecZKteevNHY+0G u9TcrZevrzHYuCUhs+eXRvPlxbNKPxQLhR77fWomd6deiDaLEktxRqKhFnNRcSIA4r9H/lwC AAA=
Cc: "stox@ietf.org" <stox@ietf.org>
Subject: Re: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking
X-BeenThere: stox@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: SIP-TO-XMPP Working Group discussion list <stox.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/stox>, <mailto:stox-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/stox>
List-Post: <mailto:stox@ietf.org>
List-Help: <mailto:stox-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/stox>, <mailto:stox-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 05 Aug 2013 05:13:08 -0000

Hi,

> The gateway would care to translate the final response. Getting more then one 180 is not causing any harm nor does those need to be translated into different events on XMPP side.

If that's the case, then you should have to problem :) I would suggest to have some text about that, though.

And, I assume that means that possible early media from the SIP side won't be forwarded into the XMPP network either, or?

Regards,

Christer



On 08/04/2013 08:39 PM, Christer Holmberg wrote:
Hi,
 
I am not sure I understand.
 
The server may implement SIP functions like forking, and fork the INVITE. BUT, the gateway will still get the 18x responses for the early dialogs - just like a SIP phone.
 
Regards,
 
Christer
 
Lähettäjä: Adrian Georgescu [mailto:ag@ag-projects.com] 
Lähetetty: 4. elokuuta 2013 20:20
Vastaanottaja: Christer Holmberg
Kopio: stox@ietf.org
Aihe: Re: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking
 
The gateway lookups the SIP server for a given domain in the DNS same as any other device would do like a SIP phone configured with credentials under that domain. Is the job of that server to properly implement all SIP functions like forking proxy, handle nat traversal or registrar to name a few common features.
 
You ask what shall the world do if the SIP server of given domain does not implemented forking or other feature. My answer is the gateway must not care, is the problem of whomever manages that domain and its applications to handle such features.
 
Regards,
Adrian
 
 
 
On Aug 4, 2013, at 6:55 PM, Christer Holmberg wrote:



Hi,
 
There for sure may be a SIP server (a proxy, B2BUA and/or the remote UAS) in the network, but how can you guarantee that it will handle forking? A forking proxy will simply forward 18x responses forming the early dialogs towards the gateway, which then will have to handle them.
 
Regards,
 
Christer
 
Lähettäjä: Adrian Georgescu [mailto:ag@ag-projects.com] 
Lähetetty: 2. elokuuta 2013 13:36
Vastaanottaja: Christer Holmberg
Kopio: stox@ietf.org
Aihe: Re: [Stox] Media Sessions (draft-ietf-stox-media-01) and forking
 
 
On Aug 2, 2013, at 12:30 PM, Christer Holmberg <christer.holmberg@ericsson.com> wrote:




Hi Adrian,
 
>I would suggest that best practice is for the SIP traffic to be routed to the SIP Proxy/Registrar/Presence Agent of the given domain behind the gateway. That element has more proper capabilities for handling forking or any other SIP features. 
 
Ok, but how are you going to ensure that such element exists?
 
The gateway knows, it queries the DNS for the domain SIP service records. If no proper records exist, the call flow will stop as there is nothing to rote the calls flows to. 
 
Such gateway, its very existence, implies that there is both a SIP Server and and XMPP server for each domain. It is a cross protocol federation, the domain must exists otherwise there is nothing to gateway to and there is no reason to deploy it. 
 
Adrian
 
 
Regards,
 
Christer
 
 
 
 
 
Otherwise you will move all SIP functionality into the XMPP gateway and must document that whole SIP universe as running inside that gateway, which makes little sense.
 
Regards, 
Adrian
 
On Aug 2, 2013, at 12:16 PM, Christer Holmberg <christer.holmberg@ericsson.com> wrote:





Hi,
 
As I indicated at the STOX session (and was later repeated by Jonathan Lennox), the draft need to have a story on SIP forking, e.g. if what happens if the INVITE sent from the interworking node gets forked, and multiple early dialogs are created.
 
Regards,
 
Christer
 
_______________________________________________
stox mailing list
stox@ietf.org
https://www.ietf.org/mailman/listinfo/stox
 
_______________________________________________
stox mailing list
stox@ietf.org
https://www.ietf.org/mailman/listinfo/stox
 
_______________________________________________
stox mailing list
stox@ietf.org
https://www.ietf.org/mailman/listinfo/stox