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Re: [payload] SDP O/A -- L, D, ToP and Flexible mode

Bernard Aboba <bernard.aboba@gmail.com> Tue, 05 March 2019 20:20 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Tue, 05 Mar 2019 12:20:13 -0800
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To: Bernard Aboba <Bernard.Aboba=40microsoft.com@dmarc.ietf.org>
Cc: Varun Singh <varun@callstats.io>, "payload@ietf.org" <payload@ietf.org>, Robin Raymond <robin@opticaltone.com>
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Subject: Re: [payload] SDP O/A -- L, D, ToP and Flexible mode
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Varun --

Have your suggestions for clarifying the SDP O/A answer negotiation in the
document made it into the updates to draft-ietf-payload-flexible-fec-scheme?

I re-read the latest update, and the problems still seem like they remain.



On Tue, Feb 12, 2019 at 3:09 PM Bernard Aboba <Bernard.Aboba=
40microsoft.com@dmarc.ietf.org> wrote:

> On Feb 12, 2019, at 2:12 PM, Varun Singh <varun@callstats.io> wrote:
> >
> > Do ToP modes 0, 1, and 2 implicitly mean no RTX?
>
> [BA] I believe that is what is implicit now, though it doesn’t make much
> sense to me.
>
> > If so, why do we have this following ambiguity  (L, D, ToP are all
> missing) means it is both Flexfec FEC and flexfec RTX?
>
> [BA] Good question. For me, flexible versus fixed and rtx/no rtx are
> orthogonal questions.
>
> > I think the implicit assumption is that all of  flex FEC spec is
> implemented.
> >
> > Offer can send and receive  X and answerer can send and receive Y.
> >
> > I can’t see why we would endorse a partial implementation?
>
> [BA] I agree that all major features and bitmask sizes should be mandatory
> to implement. Would also like to see requirements on supported L and D
> values. With this clarified the declarative model would work much better.
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