> Suppose a dialog is established between UA1 and UA2.
> UA1 specified Contact: <sip:[EMAIL PROTECTED]:5060> 
> in the INVITE that established the dialog.
> 
> ua1.com resolves, in the DNS, to the following 
> IP addresses: 
> 1.2.3.4 and 4.5.6.7
> 
> Question:
> Is it valid for UA2 to use the IP addresses of 
> ua1.com in the BYE to terminate the dialog? 

No.

> Or in a re-INVITE or other in-dialog requests?

No.

> Specifically,
> Is it to be expected that UA1 should accept any 
> of the following 3 as requests targeted at itself, 
> within the establised dialog?

No, however some UA's allow it.

> i.e. are the three considered equivalent and UA2 
> is allowed to send any of them?

No.

> BYE sip:[EMAIL PROTECTED]
> BYE sip:[EMAIL PROTECTED]
> BYE sip:[EMAIL PROTECTED]:5060

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