[SR-Users] NATDETECT Flag 16

[Henning Westerholt]

Am Mittwoch, 21. März 2018, 08:10:39 CET schrieb Henning Westerholt:
> Am Dienstag, 20. März 2018, 17:40:26 CET schrieb Duarte Rocha:
> > I have a doubt about the flag 16 used in nat_uac_test() belonging to the
> > module NATDETECT.
> > 
> > In the documentation, the following is stated :
> > 
> > *16* - Test if the source port is different from the port in the “Via”
> > header
> > 
> > I have some situations that I receive a request from port 5060 and the Via
> > Header contains no port. I think it probably assumes that it is the
> > default
> > port.
> > 
> > Will this situation trigger the "16" flag ?
> 
> Hello,
> 
> I haven't tested it for you. :-)
> 
> But as I look to the code, it should then assume that its the default SIP
> port 5060.
> 
> nat_uac_test -> received_via_test -> check_via_address:
> "if (port==0) port=SIP_PORT;"

This one for was for the complete address comparison, but for the port its the 
same:

nathelper.c:
if((tests & NAT_UAC_TEST_RPORT) && (msg->rcv.src_port != (msg->via1->port ? 
msg->via1->port : SIP_PORT)))

Best regards,

Henning