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

Bernard Aboba <Bernard.Aboba@microsoft.com> Tue, 12 February 2019 23:09 UTC

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From: Bernard Aboba <Bernard.Aboba@microsoft.com>
To: Varun Singh <varun@callstats.io>
CC: "Ali C. Begen" <ali.begen@networked.media>, Justin Uberti <juberti@google.com>, "Mandyam, Giridhar" <mandyam@qti.qualcomm.com>, "Mo Zanaty (mzanaty)" <mzanaty@cisco.com>, Robin Raymond <robin@opticaltone.com>, "payload@ietf.org" <payload@ietf.org>
Thread-Topic: SDP O/A -- L, D, ToP and Flexible mode
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Date: Tue, 12 Feb 2019 23:08:53 +0000
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Subject: Re: [payload] SDP O/A -- L, D, ToP and Flexible mode
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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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