Hi Brian, that was the help full answer! The difference between the inbound and the outbound call was the SIP url. The good case user field: <sip:170@192.168.241.2:4901;transport=tcp>;tag=XKHKDINQGD The bad case user field: <sip:170@192.168.241.2:4901>;transport=tcp;tag=DQHZUXKOIG If the “transport=tcp” a part of the url, it works successfully. Thanks a lot! Von: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] Im Auftrag von Brian West Gesendet: Montag, 9. Mai 2016 18:47 An: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Betreff: Re: [Freeswitch-users] Bug: FreeSwitch change from TCP to UDP if he reseive a refer Guessing based on NO information provide that the refer is sent with URL that fails to include transport=tcp, which by will make it default to UDP. /b On Mon, May 9, 2016 at 11:02 AM, Alexander Haugg <Alexander.Haugg@c4b.de<mailto:Alexander.Haugg@c4b.de>> wrote: The Connection between SIP Client and FreeSwitch works with TCP only! Why there are difference from a refer to an outbound call and a refer to an inbound call? In the Trace I can see, the refer looks like equal. What can I do to make sure the FreeSwitch send the Notify in TCP? The Client have no UDP Port open for SIP. Von: freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org> [mailto:freeswitch-users-bounces@lists.freeswitch.org<mailto:freeswitch-users-bounces@lists.freeswitch.org>] Im Auftrag von Michael Jerris Gesendet: Montag, 9. Mai 2016 16:58 An: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org<mailto:freeswitch-users@lists.freeswitch.org>> Betreff: Re: [Freeswitch-users] Bug: FreeSwitch change from TCP to UDP if he reseive a refer This can happen based on the content of the refer, and could be normal based on the content of the refer. The transport of the original call is not related. On Monday, May 9, 2016, Alexander Haugg <Alexander.Haugg@c4b.de<mailto:Alexander.Haugg@c4b.de>> wrote: Hi all, The scenario is: - The registered SIP Client make an outbound call - After a connect the client send a refer to a new destination (Blind Transfer) - The 202 accepted is correct as tcp sended - The Notify (sipfrag 200 OK) and the following Bye will send via UDP If I do the same with an inbound call, it works successfully. Is it a Bug? My Freeswitch version is: FreeSWITCH Version 1.7.0+git~20160502T014035Z~96e963d3eb~64bit (git 96e963d 2016-05-02 01:40:35Z 64bit) Mit freundlichen Grüßen Alexander Haugg C4B Com For Business AG Gabriele-Münter-Straße 3-5 D-82110 Germering Telefon +49 89 840798-170<tel:%2B49%2089%20840798-170> Fax +49 89 840798-13170<tel:%2B49%2089%20840798-13170> alexander.haugg@c4b.de<mailto:alexander.haugg@c4b.de> www.c4b.de<http://www.c4b.de/> Registergericht: Amtsgericht München, HRB 125040 Vorstand: Bernd Woköck, Michael Schreier Aufsichtsratsvorsitzender: Dr. Helmut Maier _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org<mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org -- Brian West brian@freeswitch.org<mailto:brian@freeswitch.org> [http://billing.freeswitch.org/templates/default/img/whmcslogo.png] Twitter: @FreeSWITCH , @briankwest http://www.freeswitchbook.com http://www.freeswitchcookbook.com https://www.gofundme.com/freeswitch_ubuntu Got Bugs? Report them here<https://freeswitch.org/jira>! | Reddit: /r/freeswitch<https://www.reddit.com/r/freeswitch> T:+19184209001 | F:+19184209002 | M:+1918424WEST (9378) iNUM:+883 5100 1420 9001 | ISN:410*543 | Skype:briankwest