> I am trying to create an OUT OF DIALOG BYE.
>
> Logically, one of the options would be to change the from or 
> to tags. Just wanted to know if I send a BYE without 'to' 
> tag, will it be an out-of-dialog bye?

Per rfc3261, yes.  Per obsoleted rfc2543, maybe; it depends upon if tags
were used during call setup.


> What are the other ways of simulating an out-of-dialog bye?

You have listed them all unless you want to test dialog usage concepts
per http://tools.ietf.org/id/draft-ietf-sipping-dialogusage-06.txt and
send a BYE over subscription created dialog (or one no longer containing
INVITE usage).

Incase your questions are not related to compliance testing, rfc3261
section 15 indicates "A UA MUST NOT send a BYE outside of a dialog."

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