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<body class='hmmessage'><div dir='ltr'><div>ACK is not receiving on Proxy, It directly goes to UAS and get in loop at Proxy before relayed to bob. Can you explain why ACK is going directly to UAS while all other responses going to proxy?</div><div><br></div><div><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">   Alice            Proxy             UAS              Bob</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre>     |   INVITE       |                |                |
     |---------------&gt;|   INVITE       |                |
     |     100        |---------------&gt;|                |
     |&lt;---------------|   INVITE       |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |&lt;---------------|                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |              INVITE             |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |--------------------------------&gt;|</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |
     |                |               180               |
     |                |&lt;--------------------------------|</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |      180       |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |---------------&gt;|                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |      180       |                |
     |      180       |&lt;---------------|                |
     |&lt;---------------|                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |               200               |
     |                |&lt;--------------------------------|</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |      200       |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |---------------&gt;|                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre>     |                |      200       |                |
     |                |&lt;---------------|                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |       200      |                |                |</pre>     |&lt;---------------|                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre>     |               ACK               |                |
     |--------------------------------&gt;|                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |       ACK      |                |
     |                |&lt;---------------|                |
     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |               ACK               |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |               ACK               |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |                |                |                |</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     |               ACK               |                |</pre>     .                .                .                .</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     .                .                .                .</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">     .                .                .                .</pre>
     </pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;"><br></pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">Regards</pre><pre class="newpage" style="font-size: 13.3333330154419px; margin-top: 0px; margin-bottom: 0px; page-break-before: always;">Hamid R. Hashmi</pre></div>                                               </div></body>
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