Re: [sipcore] Content-Disposition questions

Hi Paul,

It is not the default handling value that is different for the qsig/isup bodies - it is the default type value ("signal", rather than "render").

I am not sure I agree with Thomas that a SIP client must support the qsig/isup bodies. Yes, 3261 does reference the CR, but mostly for information regarding the C-D header field itself.

Regards,

Christer

Sent from my Windows Phone
________________________________
From: Paul Kyzivat<mailto:pkyzivat@alum.mit.edu>
Sent: ‎10/‎03/‎2015 16:58
To: sipcore@ietf.org<mailto:sipcore@ietf.org>
Subject: Re: [sipcore] Content-Disposition questions

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

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