[media-types] Re: Conclusion of indication of RTP Payload fo rmats in Media Types registry

On 7/25/25 10:36, Magnus Westerlund wrote:
> AVTCORE and Mediaman
> 
> In today’s Mediaman WG meeting the question of indication of RTP payload 
> format in the IANA Media Type registry was discussed. The github issue 
> for this issue: https://github.com/ietf-wg-mediaman/6838bis/issues/18 
> <https://github.com/ietf-wg-mediaman/6838bis/issues/18>
> 
> The problem with adding an indication in the IANA table is that it 
> creates a precedence of having information in the table that is only 
> useful for a particular user set of the media types, and not everyone. I 
> see the issues with this. The conclusion of the issue was to close it 
> without any further changes to media types registration rule or the 
> registry.
> 
> It is important to note that RTP payload formats are still detectable if 
> one look at their Media Types registration as they use both Encoding: 
> framed, as well as Restriction and usages. However, for older RTP 
> payload types this has not be consistently applied.
> 
> Mark Nottingham also asked if AVTCORE could not create a new registry 
> for RTP Payload types to correctly include all that are RTP payload types?
> 
>  From my perspective this is possible. There is a construction that 
> could ensure that in the future one do not miss to registration in both 
> registries. If the RTP Payload format only register in the new registry 
> and that registry has a rule that any registration in this table MUST be 
> first added to the Media Types registry one can avoid mistakes as IANA 
> will follow the rules for the new registry and ensure consistency.

Note: This rule will not prevent the situation where a payload type is 
registered in the media types registry and not in the RTP payload format 
registry. I think we have a few examples of that in the old registry too.

> 
> So the above would be if there are significant value to have a single 
> table that contains all RTP payload formats. If that is desirable the 
> actions for someone in AVTCORE would be the following:
> 
> Write new registration rules for RTP payload format that defines a new 
> registry, the registry rules for this registry are:
> 
>   * Request registration in the new registry that list media type and
>     reference
>   * Registratnts must create a filled in Media Type registry request
>     that can complete the Media Types registration process including
>     expert review in applicable cases.
>   * Registaration in this registry require that IANA request Media Types
>     registration for the request type
>   * If the registration is granted IESG or Expert approval then the
>     entry is added to the new registry.
> 
> I am not volunteering to write this document.
> 
> Cheers
> 
> Magnus Westerlund
> 
> 
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