I found the answer, for anybody reading this in the future: The asterisk at IVR was lacking of a default extension, triggering this bug: https://issues.asterisk.org/jira/browse/ASTERISK-20180 Apparently, Kamailio does not send BYE if OPTIONS returned 404.
-- Ariel Wainer Contenta Mobile _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
