3.4 now points forwards to 4.4.1; 4.4.1 carries the text
Finally, after any necessary messaging association setup has
completed, a Confirm MUST be sent if the Response requested it. Once
the Confirm has been sent, the Querying node assumes that routing
state has been installed at the responder, and can send normal Data
messages for the flow in question; recovery from a lost Confirm is
discussed in Section 5.3.3.
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