Re: [MMUSIC] Partial Offer/Partial Answer draft - MIME type value

[Paul Kyzivat <[e-mail]>]

On 10/18/13 2:11 PM, Christer Holmberg wrote:
> Hi,
>
> The draft says that one will use the "application/sdpfrag" MIME type value for POFs and PANs.
>
> What about using "application/sdp" - ie the same MIME type value as for "normal" SDP Offers and Answers? From a SDP syntax perspective it should not be a problem - any SDP parser will be able to parse a POF/PAN.
>
> An entity that does not support POF/PAN would probably trigger an error. BUT, maybe that is good: It could be a mechanism to verify that all SDP processing/inspecting entities along the signaling path actually support the mechanism. At least for SIP I can't think of any other mechanism to do that (we can't use Proxy-Require).
>
> Comments?

It isn't the same as SDP. The SDP fragments aren't syntactically valid 
SDP - they are missing some mandatory fields.

Conceivably the POF/PAN stuff could require more, so that they are 
syntactically valid SDP. But do we want to?

And required processing is semantically different. If it were the same 
content type then some other means would be required to indicate that it 
is being used for POF/PAN, not offer/answer. Adam isn't talking about 
that part. In sip, that could be done via content-disposition.

	Thanks,
	Paul