Re: [sip] extensions of "handling" parameter of Content-Disposition header

Absolutely.  Here is the deal:

;handling is a parameter that tells the UAS that is MUST (or MAY)  
understand the body part in its processing of the SIP message.  
"Understand" usually means "can process" the body part, but that is an  
implementation issue.

Content-Disposition is a parameter that tells the UAS what to do with  
the body part.

Now, looking at your question, Content-Disposition is probably not  
what you want, either. You say, "to signal a particular action which  
the sender requests from the recipient". That implies signaling.  
Content-Disposition is not signaling. Content-Disposition is a hint to  
the UAS as to what it should do with the body. If you want to signal  
an action at the UAS, then you more likely want one of (new) INFO  
packages, PUBLISH/SUBSCRIBE, or a new SIP header.

What precisely is the use case behind your request?


On Sep 19, 2008, at 7:16 AM, Sedlacek Ivo wrote:

> Just to be absolutely sure - do you mean that it is more appropriate  
> to create a new disposition-type of the Content-Disposition header  
> (rather than creating new "handling" parameter values)? Thanks.
>
> Kind regards
>
> Ivo Sedlacek
> Siemens
> PSE CZ TMM MMA8
> phone: +420 5 3877 6532
> email: [email protected], [email protected]
>
> Mailcode: tL3PbjBL
>
> -----Original Message-----
> From: ext Paul Kyzivat [mailto:[email protected]]
> Sent: 19. září 2008 14:08
> To: Sedlacek Ivo
> Cc: [email protected]
> Subject: Re: [Sip] [sip] extensions of "handling" parameter of  
> Content-Disposition header
>
> I can't think why you would want to have added values for the handling
> parameter. IMO what you want to do would be better served by values of
> the Content-Disposition itself.
>
>         Thanks,
>         Paul
>
> Sedlacek Ivo wrote:
> > Hello,
> >
> > can anyone please give me an expert opinion on possible extensions  
> of
> > "handling" parameter defined in RFC3204/RFC3459?
> >
> > Is it appropriate to extend and use the "handling" parameter of
> > Content-Disposition header of a MIME body inserted in a SIP  
> request to
> > signal a particular action which the sender requests from the  
> recipient?
> >
> > For example - if the "handling" parameter contained value "XYZ",  
> the SIP
> > request recipient would do a special action ActionXYZ using the MIME
> > body. If the MIME body was included in the SIP request without the
> > "handling" parameter, the recipient would NOT do the special  
> action XYZ
> > and instead would just store or render the MIME body.
> >
> > AFAIK, RFC3204 defines parameter "handling" of Content-Disposition
> > header of a MIME body with two defined parameter values "required"  
> and
> > "optional" and allows for possible future extensions. RFC3204 also
> > states "The handling parameter, handling-parm, describes how the UAS
> > should react if it receives a message body whose content type or
> > disposition type it does not understand". RFC3459 says "The protocol
> > described here is identical in functionality to RFC 3204 with  
> respect to
> > SIP.".
> >
> > Kind regards
> >
> > *Ivo Sedlacek*
> > Siemens
> > PSE CZ TMM MMA8
> > phone: +420 5 3877 6532 <tel:+420543106532>
> > email: [email protected] <mailto:[email protected]>,
> > [email protected] <mailto:[email protected]>
> >
> > Mailcode: tL3PbjBL
> >
> >
> >
> >  
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> >
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