> So far, it seems that a UA could use INVITE-with-Replaces
> (sent from the new interface to the other party) to
> transfer the dialog from its old interface to its new
> interface.  Has anyone implemented such a technique?

Yes; with B2BUA acting upon Replaces.

If it matters, solutions using things like Replaces and REFER raise the
typical concerns with authorization, security, billing, et cetera.  For
instance, see security section of RFC 3891.
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