Dear folks,

I have a question what is different, UPDATE and reINVITE?
In RFC3311(5.1.) it is written as follows:

Although UPDATE can be used on confirmed
   dialogs, it is RECOMMENDED that a re-INVITE be used instead.  This is
   because an UPDATE needs to be answered immediately, ruling out the
   possibility of user approval.  Such approval will frequently be
   needed, and is possible with a re-INVITE.

But I can NOT think out a good example flow.
If you think out it, please let me know.

Thanks,
Tabt
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