<p></p>
<p dir="auto">Thanks for pointing out that part of RFC 3261.  I wonder how this this would work with a UDP-registered phone, and an assumption that it will have taken precautions to also be reachable over TCP.  Not an issue in IPv4 if you Do Fragment, but possibly breaking for IPv6 reachability.  (That's why I reported as a bug, not a feature request.)</p>

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