Media Types in 3GPP Timed text draft (was: RE: [AVT] RTP and Media Types)

[Magnus Westerlund]

Hi,

As the RTP payload format is developed in IETF, rather than 3GPP I think 
the MIME type used to identify that RTP payload format belongs in the 
IETF tree. Especially as the vendor tree implies that the 3GPP has 
control over the registration and any updates, which I don't think is 
appropriate for this payload format.

The question is if 3GPP timed text should be registered in video, text, 
or both. My reasoning behind actually registering in both media types, 
would if one had clear indications that both are appropriate for 
different usages of the RTP payload format.

Cheers

Magnus

Colin Perkins wrote:

> [Please keep the AVT list as a cc, so the authors of the draft get a copy]
> 
> The aim here is to register the media type for use in RTP sessions, 
> which are negotiated using SIP. Registering it under "application" or 
> "vnd.3gpp" would complicate the signalling, and it would be preferable 
> from our point of view to register this under "text" or "video" (as has 
> been done with other RTP payload formats).
> 
> That said, I'm not sure how the vnd tree works, so there may be a good 
> reason to register it there, and then work out how to change SIP and/or 
> SDP to make use of it.
> 
> Colin
> 
> 

-- 

Magnus Westerlund

Multimedia Technologies, Ericsson Research EAB/TVA/A
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