In kamailio/etc/kamailio.cfg NAT test is based on nat_uac_test("19").
19 includes test 16:16 - Test if the source port is different from the port in the “Via” header. If the “Via” header contains no port, it uses the default SIP port 5060 Based on a couple of tests using baresip, looks like that results in false positive when UA connects to SIP proxy via TCP. An example: T 2020/03/24 13:57:12.685441 192.26.134.10:38940 -> 192.26.134.1:5060 [AP] #127 REGISTER sip:test.tutpro.com SIP/2.0. Via: SIP/2.0/TCP 192.26.134.10:44717;branch=z9hG4bK5b6aa423104ef942;rport. Does someone know why test 16 is included? -- Juha _______________________________________________ Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
