[OpenSIPS-Devel] [opensips] NAT Via Test Failure (#401)

[jalung]

Bogdan, normally the script uses nat_traversal/client_nat_test("3") . I have tested flags 7 & 15 and NAT was still not detected; also tested all the flags incrementally for nathelper/nat_uac_test("127") and also not detected.  

I'm tending to think it is something out of the norm with the client's mobile network or the client itself and is a special case.

The script below enables the client to register (effectively client_nat_test("7")). Not yet known how this will affect other clients.

    route(CHECKTOPVIA);
    if (isflagset(RFC1918) || client_nat_test("3")) { 
        force_rport();
        fix_contact();
        if (is_method("REGISTER") ) {
            $avp(received_uri) = $source_uri;
            setbflag(NAT_BFLAG);
        } else {
            setflag(NAT);
        }
        if (!has_totag() && is_method("REGISTER|INVITE|SUBSCRIBE")) {
            if (proto==UDP) {
                nat_keepalive();
            } else {
                setflag(TCP_PERSISTENT_FLAG);
            }
        }
    }

<code>
route[CHECKTOPVIA] {
	if (pcre_match("$(hdr(via)[0])",".*UDP (172\.\b([1][6-9]|[2][0-9]|[3][0-1])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b).*") || pcre_match("$(hdr(via)[0])",".*UDP (10\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b).*") || pcre_match("$(hdr(via)[0])",".*UDP (192\.\b([0-9]|[1-9][0-9]|1[0-6][0-8])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b\.\b([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\b).*") ) {
		setflag(RFC1918);
	} 
}
</code>

    

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https://github.com/OpenSIPS/opensips/issues/401#issuecomment-68877883
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