> From: Fortinsky Michael
> 
> I have a couple of questions about case-sensitivity in SIP.
> Section 7.3.1 of RFC3261 states that tokens are always 
> case-insensitive.
> My questions relate specifically to the From/To tags and the branch
> parameter (which I think are both types of tokens).
> 
> (1) Should the From and To tags be considered case-sensitive or
> case-insensitive?

I am puzzled that you ask this question, as your preceeding paragraph shows
that you know how to find the answer:  Examine the grammar of To: headers in
section 25.1.  The productions at the top of page 230 include:

   tag-param = "tag" EQUAL token

(along with other productions) showing that From/To tags are tokens, and as
you note, case-insensitive.

Dale
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