Hello, I have ported PJSIP to my platform and now I am testing it by trying to get the example for simple UA working step by step from here: http://www.pjsip.org/pjsip/docs/html/page_pjsip_sample_simple_ua_c.htm I am stuck now and at the function: pjsip_inv_send_msg With the debugger I can walk through the following functions from there: pjsip_dlg_send_request pjsip_tsx_send_msg tsx_on_state_null tsx_send_msg In the 'tsx_send msg' function it calls 'pjsip_endpt_send_request_stateless' and after that the tsx->state is changed to PJSIP_TSX_STATE_TERMINATED. This will a few lines later set the status to transport_err. I have trouble to see what could be causing this. Could anyone give me a pointer of what could be going wrong here? Cheers, Gerard -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20150514/ec8032ea/attachment.html>