Hi everyone, I am currently working with sip.js and freeswitch which is currently connecting to our freeswitch via the our internal network. Looking at the registration I am seeing that the contact show fs_nat= yes. Here the registration from the server. Call-ID: 6ctjv10kv92d3eft9i6lc7 User: 01234678@example.com<mailto:01234678@example.com> Contact: "01234678" <sip:01234678@example.com;transport=ws;fs_nat=yes;fs_path=sip%3A01234678%4010.128.130.129%3A51786%3Btransport%3Dwss> Agent: SIP.js/0.15.10 Status: Registered(WSS-NAT)(unknown) EXP(2021-02-11 13:10:07) EXPSECS(658) Ping-Status: Reachable Ping-Time: 0.00 Host: example IP: 10.128.130.129 Port: 51786 Auth-User: unknown Auth-Realm: example.com MWI-Account: 01234678@example.com<mailto:01234678@example.com> Nat detection is disabled for the freeswitch and a normal snom phone registering to the server does not show the fs_nat=yes Does freeswitch always detect nat for webrtc connections? Or is there possibly something wrong in my configuration? Kind Regards, Max ------------------------------------------------------------ Phone: +491752242485 Fax: Mail: maximilian.dorn@pinguin.ag ------------------------------------------------------------ Phone: +49.30.30 36 63 366 Fax: +49.30.30 36 63 367 E-Mail: info@pinguin.ag<mailto:info@pinguin.ag> www.pinguin.ag<http://www.pinguin.ag> ------------------------------------------------------------ [cid:pinguin.ag_f1f2f94b-4088-4a1c-afba-e73816a444e1.png] Pinguin AG Hauptstra?e 8 | 10827 Berlin | Germany USt-ID: DE240701807 Sitz der Gesellschaft: Berlin-Sch?neberg, AG Berlin-Charlottenburg, HRB 101380 B Vorstand: Roland Becker, Aufsichtsratsvorsitzender: Clemens C. Vogelsberg