I think the -nonat switch only stops FS from detecting NAT during startup. FreeSWITCH can be told to be very aggressive about working through NAT using various settings. Also, I was recently trying to solve what I believed to be a NAT problem and discovered that the various NAT settings do not do exactly what you might think. It is worth reading the wiki about them. https://freeswitch.org/confluence/display/FREESWITCH/NAT+Traversal That is all the help I can provide at this point, I’m afraid. John Boteler Bote Communications From: FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> On Behalf Of Carsten Bock Sent: Tuesday, 16 February, 2021 07:08 To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Subject: Re: [Freeswitch-users] Reply to Via Yes, FreeSwitch is started with "-nonat"... Thanks, Carsten -- Carsten Bock I CTO & Founder ng-voice GmbH Trostbrücke 1 I 20457 Hamburg I Germany T +49 40 524 75 93-40 | M +49 179 2021244 I <http://www.ng-voice.com/> www.ng-voice.com Registry Office at Local Court Hamburg, HRB 120189 Managing Directors: Dr. David Bachmann, Carsten Bock Am Di., 16. Feb. 2021 um 11:51 Uhr schrieb David Villasmil <david.villasmil.work@gmail.com <mailto:david.villasmil.work@gmail.com> >: -nonat ? On Tue, 16 Feb 2021 at 10:00, Carsten Bock <carsten@ng-voice.com <mailto:carsten@ng-voice.com> > wrote: Hi, I have a quick NAT related question. Is there a way to disable NAT handling completely? FreeSwitch always replies to the IP/Port were it received the message from and not to the host/port in Via.... recv 1166 bytes from udp/[172.17.0.1]:36835 at 10:20:56.652918: ------------------------------------------------------------------------ INVITE sip:ann-early@167.99.136.226:5080 <http://sip:ann-early@167.99.136.226:5080> SIP/2.0 Record-Route: <sip:167.99.136.226:5070;lr> Via: SIP/2.0/UDP 167.99.136.226:5070;branch=z9hG4bKe305.92946d84.0 Via: SIP/2.0/UDP 192.168.178.52:37350;received=93.221.23.15;branch=z9hG4bK-524287-1---936bd2b8103acd0c;rport=37350 [...] send 366 bytes to udp/[172.17.0.1]:5070 at 10:20:56.659313: ------------------------------------------------------------------------ SIP/2.0 100 Trying Via: SIP/2.0/UDP 167.99.136.226:5070;branch=z9hG4bKe305.92946d84.0;received=172.17.0.1 From: <sip:b2bua@167.99.136.226:5070;transport=UDP>;tag=7793d52b To: <sip:3@167.99.136.226:5070 <http://sip:3@167.99.136.226:5070> > Call-ID: akjc99KAbZfHxXHSea_iTQ.. CSeq: 1 INVITE User-Agent: FreeSWITCH-mod_sofia/1.10.5-release+git-20201002T121516Z~a1bfb14c04~64bit Content-Length: 0 Is there a way, to make FreeSwitch simply reply to the Host/Port in the Via-Header? My Profile is rather simple and I tried it with setting the local network ACS and NDLB-force-rport: <profile name="local"> <settings> <param name="local-network-acl" value="none"/> <param name="NDLB-force-rport" value="disabled"/> <param name="context" value="local"/> <param name="sip-ip" value="$${local_address}"/> <param name="ext-sip-ip" value="autonat:167.99.136.226"/> <param name="sip-port" value="5080"/> <param name="rtp-ip" value="$${local_address}"/> <param name="ext-rtp-ip" value="autonat:167.99.136.226"/> <param name="auth-calls" value="false"/> </settings> </profile> Changing "NDLB-force-rport" to false did not have any impact. Thanks, Carsten -- Carsten Bock I CTO & Founder ng-voice GmbH Trostbrücke 1 <https://www.google.com/maps/search/Trostbr%C3%BCcke+1?entry=gmail&source=g> I 20457 Hamburg I Germany T +49 40 524 75 93-40 | M +49 179 2021244 I <http://www.ng-voice.com/> www.ng-voice.com Registry Office at Local Court Hamburg, HRB 120189 Managing Directors: Dr. David Bachmann, Carsten Bock _________________________________________________________________________ The FreeSWITCH project is sponsored by SignalWire https://signalwire.com Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services. Build your next product on our scalable cloud platform. Join our online community to chat in real time https://signalwire.community Professional FreeSWITCH Services sales@freeswitch.com <mailto:sales@freeswitch.com> https://freeswitch.com Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://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 https://freeswitch.com -- Regards, David Villasmil email: david.villasmil.work@gmail.com <mailto:david.villasmil.work@gmail.com> phone: +34669448337 _________________________________________________________________________ The FreeSWITCH project is sponsored by SignalWire https://signalwire.com Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services. Build your next product on our scalable cloud platform. Join our online community to chat in real time https://signalwire.community Professional FreeSWITCH Services sales@freeswitch.com <mailto:sales@freeswitch.com> https://freeswitch.com Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://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 https://freeswitch.com