RE: [Sip] Support for Multipart/MIME

["Christer Holmberg \(JO/LMF\)" <[e-mail]>]

Hi, 

>>The point is that, depending on what media the answerer chooses, 
>>different codecs can be used for chosen media streams.
>> 
>>Yes, "vanilla" SDP allows me to offer audio and video, and the 
>>answerer can incdicate what it does/doesn't support. But, vanilla SDP 
>>does not allow the offer to say: "Here is audio and video. If you 
>>accept both then let's use these codecs, but if you only choose audio 
>>then let's use theis other codec".
> 
>SDP Capabilities Negotiation does that, too -- and far better 
>than multipart/alternative.

I haven't seen any comparision between the mechanisms, so I can't
comment on the "far better" statement at this point.

But, in order to do the same thing with SDP CapNeg, I assume it does
require the remote terminal to actually support SDP CapNeg?

I agree that many terminals don't support multipart today, but wasn't
the initial issue of this thread that we want to mandate the support of
multipart (at least multipart/mixed)?

Also, my initial intention was not to compare multipart/alternative with
SDP CapNeg, but to give an example what multipart/alternative could be
used for.

Regards,

Christer


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