Re: [MMUSIC] WG adoption of other WebRTC data channel usage drafts?; Re: New Version Notification for draft-ietf-mmusic-msrp-usage-data-channel-02.txt
Ted Hardie <ted.ietf@gmail.com> Fri, 16 October 2015 22:39 UTC
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Date: Fri, 16 Oct 2015 15:39:37 -0700
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From: Ted Hardie <ted.ietf@gmail.com>
To: Gunnar Hellström <gunnar.hellstrom@omnitor.se>
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Subject: Re: [MMUSIC] WG adoption of other WebRTC data channel usage drafts?; Re: New Version Notification for draft-ietf-mmusic-msrp-usage-data-channel-02.txt
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On Fri, Oct 16, 2015 at 3:21 PM, Gunnar Hellström < gunnar.hellstrom@omnitor.se> wrote: > > Yes, but it is useful to use sdpneg to tell the other party what protocol > you want to use. > > I think this is where the confusion lies. My understanding from Paul's message was that he felt that WebRTC endpoints could exchange real time text over a data channel, using T.140. In 4103 terms, I thought that meant sending text/t140 in RTP payload format (that is, one "T140block" per payload). I believe you could do this just using SCTP payload protocol identifiers. Any webrtc endpoint that received that would then send it off to whatever is listed in its media types handler registry as owning T.140 (if there is one). Presuming that this data channel is being negotiated between two clients both of which share the same javascript application, you could also assume that they negotiated it because they could handle the media type themselves. That case isn't very different from the subprotocol case it's simply that it's a default rather than a named subprotocol. I note that if you go the sub-protocol route, your T.140 data channel will only get used if exactly the same sub-protocol is used (chat.example.com won't be able to talk to chat.example.org), even if both could handle the T.140 media type in RTP payload format. regards, Ted
- [MMUSIC] WG adoption of other WebRTC data channel… Schwarz, Albrecht (Albrecht)
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Schwarz, Albrecht (Albrecht)
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Roman Shpount
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Flemming Andreasen
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Christer Holmberg
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Schwarz, Albrecht (Albrecht)
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Christer Holmberg
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Christer Holmberg
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Gunnar Hellström
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Ted Hardie
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Gunnar Hellström
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Ted Hardie
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Christer Holmberg
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Gunnar Hellström
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Paul Kyzivat
- Re: [MMUSIC] WG adoption of other WebRTC data cha… DRAGE, Keith (Keith)
- Re: [MMUSIC] WG adoption of other WebRTC data cha… Christian Groves