[Sip] Question on rfc3263 - locating sip servers

[Udi Weintrob <udiw@radvision.com>]

Hi,
I have a question regarding RFC3263.

from the RFC (4):
Because the ACK request for 2xx responses to INVITE constitutes a
different transaction, there is no requirement that it be delivered
to the same server that received the original request (indeed, if
that server did not record-route, it will not get the ACK).

Does that mean that for ACK on 2xx responses, I need to re-query the DNS
server (assuming a non IP uri)?
Do I need to query the DNS even if the URI of the ACK is the same as the URI
of the initial INVITE request?

thanks,
Udi J. Tirosh.

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