Re: [sipcore] Content-Disposition questions

[Paul Kyzivat <[e-mail]>]

On 3/10/15 5:45 AM, Stach, Thomas wrote:

>> QUESTION_2: If, for a specific message body, the "render" default type can be
>> overwritten, shouldn't that be mentioned in 3261?
>
> I think this is already written down. The last sentence in section 20.11 reads
> "   If this header field is missing, the MIME type determines the default
>     content disposition.  If there is none, "render" is assumed."
>
> So, if the MIME type is understood, the default disposition from the
> corresponding MIME definition applies. Of course, this default disposition
> can be overwritten by sending a corresponding C-D header field, as e.g. ECMA-355 does for "qsig".
> "render" kicks in, only if the MIME type is not understood and if C-D is omitted.
> Does this make sense?

That has a problem. It makes no sense to define a default handling 
parameter value for a specific mime type that applies when the C-D isn't 
present. Suppose you define a mime type where the default handling is 
"optional".

Then a receiver that does understand the mime type will treat the 
handling as optional, but that is irrelevant because this only applies 
if the mime type is not understood.

A receiver that does not understand the mime type will use the global 
default handling value "required".

	Thanks,
	Paul