What could change this behavior? I see that the first 404 I get return is passed on. Could it be the t_newtran(). I Honestly don't remember why we put it there. if ( !lookup("doorlocation") ) {                 $var(rc) = $rc;                 t_newtran();                 switch ($var(rc)) { The doorlocation is also a "fake" location table, not used for registrations, but to make a branch to either a fixed terminal, or a mobile phone, which uses a second location table. The fixed terminal can right away return 404, but the mobile phone, first has to receive a push, which can take some seconds. Can this time difference in reply cause the issue?   Kjeld Flarup 2018-04-16 9:23 GMT+02:00 Daniel-Constantin Mierla &lt;miconda(a)gmail.com <mailto:miconda@gmail.com>>: Hello, you do not need to discard the branch replies at all. Kamailio sends only one reply back, even if you do many outgoing branches, kamailio is going to wait until all of the get a final reply and then selects the one with highest priority to send back. Cheers, Daniel On 14.04.18 23:05, Kjeld Flarup wrote: 404 on -- Daniel-Constantin Mierla www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda> Kamailio Advanced Training - April 16-18, 2018, Berlin - www.asipto.com <http://www.asipto.com> Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com <http://www.kamailioworld.com>