Hi,

Doesn't the body handling draft say that one MUST be able to parse
multipart message bodies?

So, I don't think we should forbid the usage of multiple packages. There
MAY be use-cases where it is useful, so...

I also think that the negotiation of multipart support is more generic,
so such mechanism should not be bound to INFO packages.

Regards,

Christer



 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Paul Kyzivat
Sent: 21. lokakuuta 2008 17:45
To: SIP IETF; Eric Burger
Subject: [Sip] draft-ietf-sip-info-events-00: multiple packages per INFO

Re the question about multiple packages per INFO:

    There MUST be exactly one Info Package type listed per Info-Package
    header.  Multiple Info-Packages per INFO message are disallowed.

    [EDITOR NOTE: Really?  Why not multiple Info-Packages, in a
    multipart/mime?  Well, I thought of one: it is hard to disambiguate.
    For example, take an INFO message with an Info-Package: key_image,
    caller_picture.  I then have a multipart/mime with, you guessed it,
    an image/jpeg and an image/jpeg.  I would offer we do allow this and
    require the MIME parse order of the body match the order of the
Info-
    Package enumerations; if you have too many packages or body parts or
    they do not align, you barf.  However, I timed out on this and thus
    we will have to wait for the next version for me to flesh this out.
    If we do do this, then we'll reference RFC 3261 as updated by
    draft-ietf-sip-body-handling to require multipart MIME handling.]

How about defining an initial package type of "multipart". It allows
only content-type multipart/mixed. Then each contained type must have
its own Info-Package header. If you want to allow multiple packages per
INFO then you need to negotiate support for "multipart". Or maybe we
require support of multipart if you support any other package type.

        Thanks,
        Paul
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