> Certainly the motivation for the existing wording was to 
> accommodate REFER, and I suppose similar arrangements.

Yes; and subscriptions created through configuration (section 3.2.2).


> NOTIFYs that don't contain a to-tag don't identify an 
> expected dialog, so I don't think they are consistent 
> with a dialog established by other means.

For backwards compatibility with rfc2543 devices, dialogs can exist
without tags.  For Replaces, RFC3891 defaults such situations as tag=0.

If REFER sent over dialog by rfc2543 device that didn't include tag
during call setup, the NOTIFY will not contain a To tag.

I only raise this point because it is the way I see that a NOTIFY
without a To tag complies with rfc3265. :)

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