24 Mar
2020
24 Mar
'20
8:01 a.m.
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