From: "DRAGE, Keith \(Keith\)" <[EMAIL PROTECTED]>

   Well, at the moment, what I am trying to do is get some understanding of
   what we should scope as valid SIP work.

I've been busy, so I may be behind in the discussion, but it's not
clear to me that there is anything that needs to be done specifically
for SIP.  I may well be wrong, but my impression is that MIME already
has the features and specifications neede so that a receiver can
decide whether it has adequately "understood" the document when it
only understands some components.  These mechanisms are all inherited
by SIP and I would expect be a sufficient set of rules.

E.g., a UAC that sends a request with a multipart body must expect
that some UASs will respond with 415, and have some strategy in place
for dealing with that situation.  Similarly, a UAC that sends a nested
multipart body must expect that some UASs will be unable to process
the nested multipart, and will either ignore it or reject the request
(as specified), and the UAC must be prepared to deal with that
situation.

Is there a reason we need to define new, narrower subsets of allowed
behaviors and define a SIP mechanism to negotiate these?

Dale


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