<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi team!<div class=""><br class=""></div><div class="">I’ve recently found an issue in my Kamailio setup. It appears when the trunk replies to call in progress with a BYE, we relay it immediately back to them:</div><div class=""><br class=""></div><div class=""><a href="https://i.imgur.com/h5fusau.png" class="">https://i.imgur.com/h5fusau.png</a></div><div class=""><br class=""></div><div class="">The only differences in the second BYE is the Route header is removed and replaced with a Via header referencing the Kamailio machine, and the From URI is rewritten to show the Kamailio hostname.<br class="">
<br class=""></div><div class=""><br class=""></div><div class="">I’m unsure what steps I can take here, as all of my out of dialog messages (180, 200, ACK) are forwarded along with no issue. It seems only the in dialog are having this issue.</div><div class=""><br class=""></div><div class="">Here’s my WITHINDLG and RELAY:</div><div class=""><br class=""></div><div class=""><div style="color: rgb(212, 212, 212); background-color: rgb(30, 30, 30); font-family: Menlo, Monaco, "Courier New", monospace; line-height: 18px; white-space: pre;" class=""><div class=""> <span style="color: #c586c0;" class="">def</span> <span style="color: #dcdcaa;" class="">ksr_route_relay</span>()</div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_method_in(<span style="color: #ce9178;" class="">"IBSU"</span>) <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_is_set(<span style="color: #ce9178;" class="">"branch_route"</span>) < <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_on_branch(<span style="color: #ce9178;" class="">"ksr_branch_manage"</span>)</div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_method_in(<span style="color: #ce9178;" class="">"ISU"</span>) <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_is_set(<span style="color: #ce9178;" class="">"onreply_route"</span>) < <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_on_reply(<span style="color: #ce9178;" class="">"ksr_onreply_manage"</span>)</div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #6a9955;" class="">#<a href="http://KSR.info" class="">KSR.info</a>("Onreply route: #{KSR::TM.t_is_set("onreply_route")}")</span></div><div class=""> <span style="color: #c586c0;" class="">end</span> </div><div class=""> </div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_INVITE() <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_is_set(<span style="color: #ce9178;" class="">"failure_route"</span>) < <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_on_failure(<span style="color: #ce9178;" class="">"ksr_failure_manage"</span>)</div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> </div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_relay() < <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">SL</span>.sl_reply_error()</div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #dcdcaa;" class="">exit</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><br class=""><div class=""> <span style="color: #c586c0;" class="">def</span> <span style="color: #dcdcaa;" class="">ksr_route_withindlg</span>()</div><div class=""> <span style="color: #c586c0;" class="">return</span> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">SIPUTILS</span>.has_totag() < <span style="color: #b5cea8;" class="">0</span></div><br class=""><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">RR</span>.loose_route() > <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> ksr_route_dlguri()</div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_BYE() <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #6a9955;" class="">#KSR.setflag($myenv['FLT_ACC'].to_i)</span></div><div class=""> <span style="color: #6a9955;" class="">#KSR.setflag($myenv['FLT_ACCFAILED'].to_i)</span></div><div class=""> <span style="color: #c586c0;" class="">elsif</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_ACK() <span style="color: #c586c0;" class="">then</span></div><div class=""> ksr_route_natmanage()</div><div class=""> <span style="color: #c586c0;" class="">elsif</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_NOTIFY() <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">RR</span>.record_route()</div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> ksr_route_relay()</div><div class=""> <span style="color: #dcdcaa;" class="">exit</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><br class=""><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>.is_ACK() <span style="color: #c586c0;" class="">then</span></div><div class=""> <span style="color: #6a9955;" class="">#<a href="http://KSR.info" class="">KSR.info</a>("Handling an ACK within dialog")</span></div><div class=""> <span style="color: #c586c0;" class="">if</span> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">TM</span>.t_check_trans() > <span style="color: #b5cea8;" class="">0</span> <span style="color: #c586c0;" class="">then</span></div><div class=""> ksr_route_relay()</div><div class=""> <span style="color: #dcdcaa;" class="">exit</span></div><div class=""> <span style="color: #c586c0;" class="">else</span></div><div class=""> <span style="color: #dcdcaa;" class="">exit</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #c586c0;" class="">end</span></div><div class=""> <span style="color: #6a9955;" class="">#<a href="http://KSR.info" class="">KSR.info</a>("404ing within dialog")</span></div><div class=""> <span style="color: #4ec9b0;" class="">KSR</span>::<span style="color: #4ec9b0;" class="">SL</span>.sl_send_reply(<span style="color: #b5cea8;" class="">404</span>, <span style="color: #ce9178;" class="">"Not here"</span>);</div><div class=""> <span style="color: #dcdcaa;" class="">exit</span></div><div class=""><span style="color: #c586c0;" class="">end</span></div></div></div><div class=""><br class=""></div><div class="">I suspect I must be sending this to the wrong branch somehow, but I’m unsure how to correct this. The call gets originally initiated from Kamailio writing a custom RURI and To header before calling t_relay(). I’m wondering if I’m somehow initiating the dialog incorrectly and as such the BYE doesn’t know where to go.</div><div class=""><br class=""></div><div class="">Thanks!</div><div class=""><br class=""></div><div class="">Andrew</div><div class=""><br class=""></div></body></html>