Re: [rtcweb] A few questions on draft-ejzak-dispatch-webrtc-data-channel-sdpneg-00
Paul Kyzivat <pkyzivat@alum.mit.edu> Wed, 26 February 2014 19:38 UTC
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Subject: Re: [rtcweb] A few questions on draft-ejzak-dispatch-webrtc-data-channel-sdpneg-00
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Randell, I agree that most of this discussion belongs elsewhere. But there are a few bits that probably do belong here. CLUE needs *something* that provides an e2e reliable channel. It could be a lot of things, e.g. TCP or TLS. We decided to go with the SCTP-based data channel that RTCWEB is defining so that we had the potential for a Webrtc endpoint to participate in CLUE without a gateway on the clue channel. That means we will also be using the same stack between non-webrtc clue endpoints that are using SIP for signaling. We are still undecided on whether to use DCEP or SDP O/A to negotiate the channel we use. If we use DCEP it will be straightforward for a webrtc endpoint. But that is a little unnatural for the sip endpoints. For them, the SDP O/A approach would be more natural. It doesn't matter much if the *only* channel being used is the clue channel. It will start to matter if there is a desire to use other channels for features that can coexist with clue. E.g. BFCP. (But now we see a proposal to put BFCP over websocket, so maybe it won't ever be an issue for us.) The important thing is that if clue decides to use SDP O/A for this, (the ejzak draft) then we must be confident that it will be feasible for a webrtc endpoint, via javascript, to participate in this negotiation and use it to set up the clue data channel. That is the part that belongs in rtcweb. Thanks, Paul On 2/25/14 5:41 PM, Randell Jesup wrote: > On 2/24/2014 10:21 AM, Christer Holmberg wrote: >> >> I still don't think the information belong to SDP - they define >> protocol characteristics. The protocol specification should define >> re-transmission timers etc. >> >> Anyway, we can argue about it later. At this moment I think the focus >> should be on whether to move forward with the mechanism to begin with, >> and the main feature of the mechanism - which is about negotiating >> usage of channels :) > > This (whether to move forward) is my concern (in addition to Mary's > about this being the wrong group - MMUSIC is where the SDP should be and > has been). > > The apparent justification for this document is "This document defines > SDP-based out-of-band negotiation procedures to establish WebRTC data > channels for transport of well-defined sub- protocols." This seems a > pretty sparse justification. > > We very purposely avoided using SDP for channel setup (after MUCH > discussion at Boston and elsewhere). That isn't to say that for > non-webrtc usage, one could define an SDP used to externally-negotiate > the settings for DataChannels, which this appears to be. But I think > there should a clearer statement as to "why" we should invest the time > to standardize this now, not just that we "can". For example, if CLUE > really wants to use this instead of in-band opens, then maybe there's a > reason to do so - but don't expect webrtc endpoints to implement this. > And if so, it should be done in CLUE by request to MMUSIC. > > At this point I don't see need to move forward with this, and certainly > not here. And I certainly don't want this to delay finalizing the stuff > needed in MMUSIC for WebRTC use of DataChannels >
- [rtcweb] A few questions on draft-ejzak-dispatch-… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Richard Ejzak
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Richard Ejzak
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Mary Barnes
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Randell Jesup
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Christer Holmberg
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Paul Kyzivat
- Re: [rtcweb] A few questions on draft-ejzak-dispa… Makaraju, Maridi Raju (Raju)