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

[Dave Singer]

At 5:55 PM +0200 8/9/04, Magnus Westerlund wrote:
>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.

I think both is the worst choice;  it's asking for interop problems, isn't it?

>
>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
>----------------------------------------------------------------------
>Ericsson AB                | Phone +46 8 4048287
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>S-164 80 Stockholm, Sweden | mailto: magnus.westerlund at ericsson.com
>
>_______________________________________________
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-- 
David Singer
Apple Computer/QuickTime