Re: [rtcweb] Working Group Last Call for draft-uberti-rtcweb-rfc8829bis-01.txt

Agree we should add a reference to 8843-bis. I assume we can do that in the
endgame as (I believe) no text in 8829bis needs to change.

Regarding 3PCC:
- bundle clients should be able to accept initial offers without
bundle-only. If not, we should fix that in 8843bis, as this seems like an
unnecessary limitation - current implementations seem to be managing this
OK.
- the stats on BUNDLE show that it has been widely adopted (99.999% usage
when there is more than 1 a/v stream), and these numbers are only
increasing. If "rare" seems overly opinionated, we could use "uncommon"
instead.

Regarding the suggested workaround:
- adding a=bundle-only is insufficient, the application would also need to
insert zero ports for the bundled m= lines. It's also not clear that this
would lead to a good outcome, as the non-bundle endpoint would only be able
to accept the first bundled m= line. So I would suggest that if 3PCC with
non-bundle-aware endpoints is likely, the application should just eat the
a=group attribute for bundle to prevent bundling in the first place.

On Tue, Oct 26, 2021 at 10:01 AM Roman Shpount <roman@telurix.com> wrote:

> Hi Ted,
>
> I have mentioned on git that:
> 1. The reference to RFC 8843bis is missing
>
> 2. The following language is factually incorrect:
>
> This is by design, but could cause issues in the rare case of sending a
> subsequent offer as an initial offer to a non-bundle-aware endpoint via
> Third Party Call Control (3PCC).
>
> Primarily, this will cause issues if a subsequent offer is used as an
> initial even with bundle-aware end points. An offer with no bundle-only
> attributes for bundled m= lines might not get processed correctly. Second,
> I would not comment on how frequent this call scenario is going to be
> unless we have to.
>
> My suggested language was:
>
> This is by design, but could cause issues in case of sending a subsequent
> offer as an initial offer due to Third Party Call Control (3PCC). In such
> cases, the signaling application is responsible for adding bundle-only
> attributes to the offer so that it can be used as an initial offer.
>
> Best Regards,
> _____________
> Roman Shpount
>
>
> On Tue, Oct 26, 2021 at 6:55 AM Ted Hardie <ted.ietf@gmail.com> wrote:
>
>> This email serves as the start of a working group last call for
>> draft-uberti-rtcweb-rfc8829bis-01.txt.  Because of the upcoming IETF
>> meeting, it will be slightly longer than normal, ending on November 16,
>> 2021.
>>
>> Please send comments to the list.
>>
>> thanks,
>>
>> Ted and Sean
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>>
>