Hi Rajah, setting pstn.gw to "1.2.3.4;transport=tcp" should help. If you need to use some other port this should help "1.2.3.4:5080;transport=tcp" Mit freundlichen Grüßen / Best regards Marco Barthel Robert Bosch GmbH (CI/AFU1) Postfach 30 02 20 70442 Stuttgart GERMANY www.bosch.com<http://www.bosch.com> Sitz: Stuttgart, Registergericht: Amtsgericht Stuttgart, HRB 14000; Aufsichtsratsvorsitzender: Franz Fehrenbach; Geschäftsführung: Dr. Volkmar Denner, Dr. Stefan Asenkerschbaumer, Dr. Rolf Bulander, Dr. Stefan Hartung, Dr. Dirk Hoheisel, Christoph Kübel, Uwe Raschke, Wolf-Henning Scheider, Dr. Werner Struth, Peter Tyroller Von: sr-users-bounces(a)lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org] Im Auftrag von Rajah Chowbay Gesendet: Sonntag, 15. Dezember 2013 01:06 An: sr-users(a)lists.sip-router.org Betreff: [SR-Users] Outbound Calls using pstn.gw_ip Setup: jitsi --> kamailio <-----> pstn.gw<http://pstn.gw/> jitsi is registered using TCP SIP Trunk between kamailio and pstn.gw<http://pstn.gw/> is using TCP Initial invite from jitsi to kamailio is sent using TCP but invite sent from kamailio to pstn.gw<http://pstn.gw/> is being sent with UDP. How can I configure kamailio to send invite to pstn.gw<http://pstn.gw/> with TCP? Thank You