<div dir="ltr"><div dir="ltr">Hi ppl,<br><div><br></div><div>Scenario: invite from upstream is t_relayed to a client gateway. After `fr_inv_timeout` occurs, in a failure route I simply t_reply with "503 - Service unavailable", then exit(). </div><div><br></div><div>However, the upstream provider simply ignores this reply, call doesn't hang up. This doesn't happen when the client's gateway generates identical 503 or other negative replies.</div><div><br></div><div>I suspect this is happening because the To-tag in the Kam generated 503 reply doesn't match with the To-tag that previously was forwarded from the client's gateway to the upstream provider in the `180 Ringing`.</div><div><br></div><div>Any suggestions what can be done about it?</div><div><br></div><div><br></div><div><div>2019/04/06 10:42:46.127177 65.39.xxx.xxx:5060 -> 208.72.xxx.xxx:5060                                                                                                                                                           </div><div>SIP/2.0 180 Ringing                                                                                                                                                                                                                         </div><div>Via: SIP/2.0/UDP 208.72.xxx.xxx:5060;received=208.72.xxx.xxx;rport=5060;branch=z9hG4bK1982422573                                                                                                        </div><div>Record-Route: <sip:65.39.xxx.xxx;lr=on;did=915.8af1>                                                                                                                                                                                        </div><div>From: "SERGIU" <sip:514XXXXXXX@208.72.xxx.xxx>;isup-oli=00;tag=1975755942                                                                                                                              </div><div>To: <sip:514XXXXXXX@65.39.xxx.xxx>;tag=<font color="#ff0000">as2ab54180 </font>                                                                                                                                                                                     </div><div>Call-ID: DID-28270826@208.72.xxx.xx                                                                                                                                                                                                         </div><div>CSeq: 477023 INVITE                                                                                                                                                                                                                         </div><div>Supported: replaces, timer, path                                                                                                                                                                                                            </div><div>Contact: <sip:1514XXXXXXX@65.39.xxx.xxx:5060>                                                                                                                                                                                               </div><div>Content-Length: 0                                                                                                                                                                                                                           </div><div>                                                                                                                                                                                                                                            </div><div>                                                                                                                                                                                                                                          </div><div>2019/04/06 10:42:51.072516 65.39.xxx.xxx:5060 -> 208.72.xxx.xxx:5060                                                                                                                                                            </div><div>SIP/2.0 503 Service Unavailable                                                                                                                                                                                                             </div><div>Call-ID: DID-28270826@208.72.xxx.xx                                                                                                                                                                                                         </div><div>Via: SIP/2.0/UDP 208.72.xxx.xxx:5060;rport=5060;branch=z9hG4bK1982422573;received=208.72.xxx.xxx                                                                                                        </div><div>From: "SERGIU" <sip:514XXXXXXX@208.72.xxx.xxx>;isup-oli=00;tag=1975755942                                                                                                                              </div><div>To: <sip:514XXXXXXX@65.39.xxx.xxx>;tag=<font color="#ff0000">a6a1c5f60faecf035a1ae5b6e96e979a-8e82</font>                                                                                                                                  </div><div>CSeq: 477023 INVITE                                                                                                                                                                                                                         </div><div>Server: KAM                                                                                                                                                                                                                                 </div><div>Content-Length: 0 </div></div><div><br></div><div>Thanks,</div><div>--Sergiu</div></div></div>