Re: [MMUSIC] Offer/Answer PT Questions

[Roman Shpount <[e-mail]>]

On Tue, Feb 23, 2016 at 1:04 PM, Christer Holmberg <
[e-mail]> wrote:

> The current rule may be easy to understand, but it's difficult to
> understand - and that's what triggered this discussion :)
>
> So, while we can discuss possible rules/guidelines on when a PT value can
> be used, I still think we need to answer the first question:
>
> - If Alice allocates PT=X for codec 1, is Bob allowed to allocate PT=X for
> codec 2 within the same session? The current text is unclear on that, and I
> think that is the first question we need to sort out.
>
> After that, we can discuss whether e.g. Alice at some point can allocate
> PT=X for codec 3, and what the criteria for that is.
>

As far as I can see there are 3 question/clarifications that are required:

1. PT is allocated per codec profile (codec and all associated parameters),
not codec. For instance, if end point uses PT=100 for SILK/8000, it cannot
reuse it for SILK/16000

2. Is PT blocked from each direction independently or both directions at
the same time. For instance if A sent an offer with PT=100, but B never
sent an offer or an answer with PT=100, can B sent an offer with PT=100?

3. PT reuse in sessions such as one triggered by 3pcc where it would be
impossible to enforce PT from ever being reused.

Regards,
_____________
Roman Shpount