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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">What
would happen in this case? If I understand correctly, the
proxy will always forward the request but the last hop
(before the UAS) will forward the request only if a
connection is active?<o:p></o:p></span></p>
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</blockquote>
correct.<br>
<blockquote cite="mid:42b101d089a0$708ff680$51afe380$@gmail.com"
type="cite">
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<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">If
the last hop doesn't forward the request because no TCP
connection exists, what happens? How the proxy will detect
this situation?</span></p>
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</blockquote>
It won't find any matching connection and won't try to establish a
new one since you asked it to not. So it will just send a reply back
to the registrar with an error. After receiving an error registrar
in its turn can perform some smart actions like forwarding to a
voicemail system.<br>
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