Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines?

Hello Christer

  A small twist on your proposal

  I think the recommendation in the BUNDLE document should say 2 points

  1. Reuse of PT is allowed only in the cases where the end-point is able
to uniquely map the incoming RTP Streams to its corresponding m=line. The
specific mechanisms to do so are out of the scope of this document .
Informally, SSRC, AppID or similar stream correlators can be used.

Also using the same PT across multiple m=lines implies the same underlying
codec configuration.

  2. Otherwise, reuse of PT across multiple m=lines MUST NOT be performed
while multiplexing.

We can add example for either if needed

Any thoughts

Thanks
Suhas

On Mon, Mar 3, 2014 at 1:17 PM, Christer Holmberg <
christer.holmberg@ericsson.com> wrote:

>  Hi,
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> Based on the discussions, we basically have two alternatives:
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> *Alternative 1*: Forbid the usage of the same PT value within multiple m-
> lines.
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> *Alternative 2*: Allow usage of the same PT value within multiple m-
> lines, and if the answer does not support whatever extensions that are
> needed for the offerer to distinguish the media, the offer needs to handle
> that, e.g. by sending a new offer with unique PT values.
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> IF we choose Alternative 2, we still need to decide whether we let the
> offerer decide when it's "appropriate" when to use the same PT value, or
> whether we need to specify some rules (as suggested by Colin). My personal
> proposal is still to let the offerer decide, and not specify any rules.
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> Regards,
>
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> Christer
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Re: [MMUSIC] IETF#89: BUNDLE: Q9: What are the criteria for allowing usage of the same PT value within multiple m- lines? - A new take.