Re: [Slim] Eric Rescorla's No Objection on draft-ietf-slim-negotiating-human-language-19: (with COMMENT)
Gunnar Hellström <gunnar.hellstrom@omnitor.se> Sun, 07 January 2018 20:43 UTC
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To: Eric Rescorla <ekr@rtfm.com>
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From: Gunnar Hellström <gunnar.hellstrom@omnitor.se>
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Date: Sun, 07 Jan 2018 21:43:37 +0100
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Subject: Re: [Slim] Eric Rescorla's No Objection on draft-ietf-slim-negotiating-human-language-19: (with COMMENT)
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Den 2018-01-07 kl. 15:36, skrev Eric Rescorla: > > > On Sat, Jan 6, 2018 at 7:31 PM, Bernard Aboba <bernard.aboba@gmail.com > <mailto:bernard.aboba@gmail.com>> wrote: > > On Jan 6, 2018, at 6:55 PM, Eric Rescorla <ekr@rtfm.com > <mailto:ekr@rtfm.com>> wrote: > >> For disabled users, the capabilities may not be symmetric. >> >> >> But this is true for ordinary SDP as well. I might be able to >> receive H.264 but not send it. > > [BA] Thanks. The draft should explain the reasoning. IMHO the > argument goes sonething like this: > > A pure recv/recv negotiation will not necessarily disclose > beforehand what special services are needed for the call - > services (e.g. ASL interpretation or RTT handling) that could take > time to acquire. > > Since the actual video media sent is not labelled as ASL even if > the answerer has ASL interpreters it can pull in and therefore > advertises in SDP ASL reception capability in video, a recv/recv > negotiation doesn’t tell the Answerer that the Offerer will need > them, so the Answerer may need to (frantically) arrange for ASL > interpretation after initial receipt of media. In an emergency, > that can chew up valuable time. > > > Thanks. I think it would be helpful to put this logic in the draft. > > That said, as I noted in my review, it is still possible to get some > media (early media) prior to receiving the answer, so this isn't a > complete solution. <GH> Good discussion. However, I wonder what problem you see with early media? The offering party is supposed to express both which media and which languages are supported for both sending and receiving. The answering party then has all needed information to start sending a matching language in a matching media as early media. The offering party will not see any explicit information about what language and media is used, but hopefully one (or more ) media and language(s) from the hlang-recv attributes will be sent, so that the contents will be perceived and understood. Then, the answer is needed with both accepted media and the indications about which language and media the answering part prefers for receive. That will be conveyed in the answer and the enabled media and selected languages can be used both ways. Your review ended a bit abruptly. Was there some intended sentence missing at the end? It ended: " One reason you might is that you expect the answer to resolve which language is in use, however because SIP supports early media (i.e., media which is delivered prior to the answer.)" We have some similarities between the draft and RFC 4796 SDP Content Attribute. The content attribute indicates only what is intended to be SENT in the media, while we have indications separately for both directions. So, that is an existing example that it may be accepted to specify intentions for what to send. I will check further where to add more explaining reasoning. Thanks, Gunnar > > -Ekr > > > > > _______________________________________________ > SLIM mailing list > SLIM@ietf.org > https://www.ietf.org/mailman/listinfo/slim -- ----------------------------------------- Gunnar Hellström Omnitor gunnar.hellstrom@omnitor.se +46 708 204 288
- [Slim] Eric Rescorla's No Objection on draft-ietf… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens (IETF)
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Bernard Aboba
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Eric Rescorla
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Paul Kyzivat
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- Re: [Slim] Eric Rescorla's No Objection on draft-… Randall Gellens
- Re: [Slim] Eric Rescorla's No Objection on draft-… Gunnar Hellström
- [Slim] Updated version addresses comments receive… Randall Gellens
- Re: [Slim] Updated version addresses comments rec… Randall Gellens
- Re: [Slim] Updated version addresses comments rec… Randall Gellens