Re: draft-ietf-sip-info-events-00: Content-Type vs Info-Package [was RE: draft-ietf-sip-info-events-00: multiple packages per INFO]

Christer,

For SDP, you find the part by looking for the one with 
Content-Disposition:session. If there is a part with no C-D header then 
one with a C-T of application/sdp defaults to "session". So its all 
about C-D.

	Paul

Christer Holmberg wrote:
> Hi, 
> 
>> I do think there is something we haven't discussed: how do we 
>> figure out what part of the overall body is the part that 
>> carries the package? 
>> Normally this is no issue, since it is the entire body of the 
>> INFO message. But there are cases where it might not be. For 
>> instance if S/MIME is used, or if there is some header in the 
>> message the needs to reference a body part from a CID URI.
>>
>> The answer to this goes back to Content-Disposition. The body 
>> part that contains the info package should have a unique C-D. 
>> That can be "render", or we could pick some other one.
> 
> I believe the mime rules are something like:
> 
> --boundary
> Mime-headers
> Empy-line
> Content (SDP, info packet, etc)
> --boundary--
> 
> 
> For SIP, the ruleas are:
> 
> SIP-part
> Empty-line
> Message body (SDP, info packet - or one of more mimes).
> 
> 
> I guess the question is whether we should define some generic syntax for
> the info packages, e.g. Something which identifies the beginning of an
> info package.
> 
> For SDP, you find the beginning by looking for the v= parameter.
> 
> Regards,
> 
> Christer
> 
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