From: <[EMAIL PROTECTED]>

   I know that call id identifies a dialog (a relationsheep between
   two users) and each new dialog has a new call-id), but if it's
   true, what's the matter of to and from tags?  Are they necessary
   only in the case of forking?

A dialog is identified by a Call-Id, a to-tag, and a from-tag.  Yes,
they are necessary only in the case for forking, but forking can
happen in any dialog-forming request, so the tags need to be used
generally.

Dale
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