W3C home > Mailing lists > Public > public-webrtc@w3.org > August 2013

RE: [rtcweb] media rollback and glare

From: Rauschenbach, Uwe (NSN - DE/Munich) <uwe.rauschenbach@nsn.com>
Date: Fri, 9 Aug 2013 11:36:10 +0000
To: ext Justin Uberti <juberti@google.com>, "public-webrtc@w3.org" <public-webrtc@w3.org>
Message-ID: <56C2F665D49E0341B9DF5938005ACDF80D3A07@DEMUMBX005.nsn-intra.net>
Hi Justin,

Thanks for pointing to the concept in JSEP. In the PeerConnection API it is still marked as “Issue 2”. Taking this thread to W3C.

What’s the plan for specifying the syntax of a ”rollback SDP” in the W3C PeerConnection draft? An RTCSessionDescription instance with type=”rollback” and sdp=null? Currently , this is marked as “Issue 2”.

Kind regards,

From: ext Justin Uberti [mailto:juberti@google.com]
Sent: Thursday, August 08, 2013 10:35 PM
To: Rauschenbach, Uwe (NSN - DE/Munich)
Cc: rtcweb@ietf.org
Subject: Re: [rtcweb] media rollback and glare

The thinking has been to pass in a SessionDescription of type "rollback" to the API. See in http://tools.ietf.org/html/draft-ietf-rtcweb-jsep-03.

On Thu, Aug 8, 2013 at 7:51 AM, Rauschenbach, Uwe (NSN - DE/Munich) <uwe.rauschenbach@nsn.com<mailto:uwe.rauschenbach@nsn.com>> wrote:


In the Open Mobile Alliance, a REST API is being defined, intended to be exposed by a gateway that offers WebRTC access to IMS (or even PSTN).
For that work, it is also necessary to understand how rollback will work in the PeerConnection API.

Kind regards,
Uwe Rauschenbach

Dr. Uwe Rauschenbach
Senior Specialist
NSN, Technology & Innovation
St.-Martin-Str. 76, D-81541 Munich, Germany
Tel.: +49 89 5159 29751<tel:%2B49%2089%205159%2029751>
Mobile: +49 173 3083573<tel:%2B49%20173%203083573>

Nokia Siemens Networks Management International GmbH
Geschäftsleitung / Board of Directors: Andreas Sauer, Ralf Dietzel
Sitz der Gesellschaft: München / Registered office: Munich
Registergericht: München / Commercial registry: Munich, HRB 198081

From: rtcweb-bounces@ietf.org<mailto:rtcweb-bounces@ietf.org> [mailto:rtcweb-bounces@ietf.org<mailto:rtcweb-bounces@ietf.org>] On Behalf Of ext Andrea Dixon
Sent: Thursday, August 08, 2013 12:17 PM
To: rtcweb@ietf.org<mailto:rtcweb@ietf.org>
Subject: [rtcweb] media rollback and glare

The Webrtc spec states:
"This API changes the local media state. In order to successfully handle scenarios where the application wants to offer to change from one media format to a different, incompatible format, the RTCPeerConnection must be able to simultaneously support use of both the old and new local descriptions (e.g. support codecs that exist in both descriptions) until a final answer is received, at which point the RTCPeerConnection can fully adopt the new local description, or roll back to the old description if the remote side denied the change.
Issue 8
ISSUE: how to indicate to roll back?"
When will rollback be added to webrtc? Is it imminent? We need it to resolve glare scenarios where both peers renegotiate at the same time. Or is there another way of resolving glare in webrtc? This is becoming a pressing concern.

Note: The information contained in this message may be privileged and confidential
and protected from disclosure. If the reader of this message is not the intended
recipient, or an employee or agent responsible for delivering this message to the
intended recipient, you are hereby notified that any dissemination, distribution or
copying of this communication is strictly prohibited. If you have received this
communication in error, please notify us immediately by replying to the message and
deleting it from your computer. Thank you. Thrupoint, Inc.
rtcweb mailing list

Received on Sunday, 11 August 2013 20:56:29 UTC

This archive was generated by hypermail 2.3.1 : Monday, 23 October 2017 15:19:35 UTC