<div dir="ltr"><div class="gmail_extra">I managed to capture the SIP traffic with Wireshark.  It seems that the party generating the 408 reply is OpenSIPS, not the callee.  OpenSIPS does not seem to forward the call to the callee at all.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Below are traces showing a successful call and a call with Request Timeout.  </div><div class="gmail_extra">The server IP is <span style="color:rgb(51,51,51);font-family:Consolas,Menlo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;DejaVu Sans Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,monospace,serif;font-size:12px;line-height:24px;background-color:rgb(248,248,248)">162.249.6.110,</span> the caller IP is <span style="color:rgb(51,51,51);font-family:Consolas,Menlo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;DejaVu Sans Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,monospace,serif;font-size:12px;line-height:24px;background-color:rgb(248,248,248)">92.40.249.9</span><span style="font-family:Consolas,Menlo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;DejaVu Sans Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,monospace,serif;font-size:12px;line-height:24px;background-color:rgb(248,248,248)"><font color="#000000">, </font></span>and the callee IP is <span style="color:rgb(51,51,51);font-family:Consolas,Menlo,Monaco,&#39;Lucida Console&#39;,&#39;Liberation Mono&#39;,&#39;DejaVu Sans Mono&#39;,&#39;Bitstream Vera Sans Mono&#39;,monospace,serif;font-size:12px;line-height:24px;background-color:rgb(248,248,248)">188.29.165.24</span>.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Trace for a successful call:</div><div class="gmail_extra"><br></div><div class="gmail_extra"><a href="http://pastebin.com/2xn0bkEU">http://pastebin.com/2xn0bkEU</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Trace for a call with Request Timeout:</div><div class="gmail_extra"><br></div><div class="gmail_extra"><a href="http://pastebin.com/WR7BA6pj">http://pastebin.com/WR7BA6pj</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Please advise what may be causing this.</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div></div>