Re: [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-rfc8829bis-00.txt

Justin Uberti <juberti@alphaexplorationco.com> Tue, 13 July 2021 17:43 UTC

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From: Justin Uberti <juberti@alphaexplorationco.com>
Date: Tue, 13 Jul 2021 10:43:21 -0700
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To: Roman Shpount <roman@telurix.com>
Cc: Justin Uberti <justin@uberti.name>, RTCWeb IETF <rtcweb@ietf.org>
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Subject: Re: [rtcweb] Fwd: New Version Notification for draft-uberti-rtcweb-rfc8829bis-00.txt
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Roman,

I see what you are getting at. I suppose that was one benefit of the other
BUNDLE syntax, i.e., that all offers (not just the first) are always
understandable by a non-BUNDLE endpoint.

That said, given the adoption of BUNDLE I tend to think that 3PCC to a
non-BUNDLE endpoint is increasingly a corner case, so it may not be worth
going to the trouble of trying to fix the SDP syntax and allowing for
mid-call unbundling.

Note also that it is not clear to me how rtcp-mux would work in a similar
situation, i.e., when doing 3PCC to a non-rtcp-mux endpoint.

Justin

On Sat, Jul 10, 2021 at 8:45 PM Roman Shpount <roman@telurix.com> wrote:

> On Sat, Jul 10, 2021 at 11:35 PM Justin Uberti <justin@uberti.name> wrote:
>
>> (To be clear, m= sections that are bundled will continue to be bundled
>> and will not participate in the restart.)
>>
>
> This is what I thought.
>
> How would one unbundle them if an offer needs to be generated for 3PCC
> (like an offer in response to an empty INVITE)? There is the iceRestart
> option for ICE to do this. Is there a need for something similar for the
> bundle to do the same thing? Please see draft-ietf-mmusic-rfc8843bis-04
> section 7.6 (
> https://www.ietf.org/archive/id/draft-ietf-mmusic-rfc8843bis-04.html#section-7.6)
> for more details.
>
> Please note that in the case of 3PCC an offer within an existing session
> for one call leg would be the initial offer for another call leg. After the
> latest change, an offer within the existing session is no longer a valid
> initial offer.
>
> Thank You,
> _____________
> Roman Shpount
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>