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Re: [Wish] Proposal: Triggering ICE Restart

Jonathan Lennox <jonathan.lennox@8x8.com> Mon, 02 August 2021 21:07 UTC

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From: Jonathan Lennox <jonathan.lennox@8x8.com>
In-Reply-To: <437e03e0-3594-2090-326e-e0859bf604d2@nostrum.com>
Date: Mon, 2 Aug 2021 17:07:14 -0400
Cc: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>, WISH List <wish@ietf.org>
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To: Adam Roach <adam@nostrum.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/wish/26YHEtJbiN7WwgaaHRmAcAo5zO8>
Subject: Re: [Wish] Proposal: Triggering ICE Restart
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> On Aug 2, 2021, at 4:14 PM, Adam Roach <adam@nostrum.com> wrote:
> 
> On 7/31/21 02:35, Sergio Garcia Murillo wrote:
>> On the other side mapping the sdp frag info to an actual sdp o/a is a trivial string replacement for the sdp answer, you can get the local username and frag from the ice transport object and add the server new candidates via the addCandidate method.
> 
> This kind of syntactic manipulation seems really inelegant to me, but I can live with it if it gets us to consensus faster.
> 
> So, in this scheme, we address the issue that Jonathan raised by returning ICE candidates in a 200 response to the PATCH request, right? Jonathan: can you see any issues with that approach?

Yeah, that seems fine; you’d have ICE candidates, and the ufrag/password, in the 200 response to a PATCH request that does an ICE restar.  (Assuming that’s sensible according to the HTTP semantics people, that is; it seems potentially odd enough that we should probably confirm this.)

We also need to clarify that servers can’t trickle their own candidates (either for the initial connection or a restart), since we’re not supporting any sort of server push that could send them.  (I don’t think the complexity of allowing servers to respond to non-restart trickle candidate PATCH requests with candidates of their own would be particularly useful.)

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