[OpenSIPS-Users] Nat woes, is fix_contact working?

[John Kiniston]

I'm working on setting up mid_registrar and it's mostly working but I have
a problem with RTP being sent to the wrong address.

I'm trying to fix this by using fix_contact in my script but it doesn't
appear to be rewriting the contact when the registrar is sent on to my
Asterisk box.

I see the request from my phone to my proxy:

U 2018/03/19 12:04:54.650203 X.X.X.X:5060 -> 192.168.69.159:5060
REGISTER sip:pi.lzrd.net:5060 SIP/2.0.
Via: SIP/2.0/UDP 172.16.52.76:5060;branch=z9hG4bK2864496306;rport.
From: "John Kiniston" <sip:7002kiniston at pi.lzrd.net:5060>;tag=2815321839.
To: "John Kiniston" <sip:7002kiniston at pi.lzrd.net:5060>.
Call-ID: 0_2089376052 at 172.16.52.76.
CSeq: 1 REGISTER.
Contact: <sip:7002kiniston at 172.16.52.76:5060>.
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER,
SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE.
Max-Forwards: 70.
User-Agent: Yealink SIP-T42S 66.81.0.110.
Expires: 0.
Allow-Events: talk,hold,conference,refer,check-sync.
Mac: 00:15:65:b4:d3:d3.
Line: 1.
Content-Length: 0.
.

And here is the request from my proxy to my PBX:

U 2018/03/19 12:04:54.808558 192.168.69.159:5060 -> 64.119.36.19:5060
REGISTER sip:pi.lzrd.net SIP/2.0.
Via: SIP/2.0/UDP 64.119.34.211:5060;branch=z9hG4bK0e8e.34dfaf97.0.
Via: SIP/2.0/UDP 172.16.52.76:5060
;received=x.x.x.x;branch=z9hG4bK2864496306;rport=5060.
From: "John Kiniston" <sip:7002kiniston at pi.lzrd.net:5060>;tag=2815321839.
To: "John Kiniston" <sip:7002kiniston at pi.lzrd.net:5060>.
Call-ID: 0_2089376052 at 172.16.52.76.
CSeq: 1 REGISTER.
Contact: <sip:7002kiniston at 192.168.69.159:5060>.
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER,
SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE.
Max-Forwards: 69.
User-Agent: Yealink SIP-T42S 66.81.0.110.
Expires: 0.
Allow-Events: talk,hold,conference,refer,check-sync.
Mac: 00:15:65:b4:d3:d3.
Line: 1.
Content-Length: 0.
Path: <sip:64.119.34.211:5060;lr>.

Shouldn't the Contact be rewritten with the source IP of the request from
the phone to X.X.X.X?


OpenSIPS$:ul show
Domain:: location table=512 records=1
        AOR:: 7002kiniston
                Contact:: sip:7002kiniston at X.X.X.X:5060 Q=
                        ContactID:: 2933602576022647686
                        Expires:: 3330
                        Callid:: 0_2936163010 at 172.16.52.76
                        Cseq:: 2
                        User-agent:: Yealink SIP-T42S 66.81.0.110
                        State:: CS_NEW
                        Flags:: 0
                        Cflags::
                        Socket:: udp:X.X.X.X:5060
                        Methods:: 16383


In my main script I have:

        if ($si == "X.X.X.X"){
                route(FromEndPoint);
        }


route[FromEndPoint]{
    route("nat_test_and_correct");
        if (is_method("INVITE")){
                if (is_registered("location","$fu")) {
                        route(outbound);
                } else {
                        t_reply("503","Authentication failed");
                }
        }
        if (is_method("SUBSCRIBE|NOTIFY|MESSAGE")){
                route(outbound);
        };
        if (is_method("REGISTER")) {
                route(register);
        }

}

route[register]{
        if (is_method("REGISTER")) {
                xlog("L_INFO","Saving location to mid_registrar");
                mid_registrar_save("location");
                switch ($retcode) {
                        case 1:
                                xlog("forwarding REGISTER to main
registrar($$ci=$ci) $ru\n");
                                $ru = "sip:" + $td:$rp;
                                t_relay();
                                break;
                        case 2:
                                xlog("absorbing REGISTER! ($$ci=$ci)\n");
                                break;
                        default:
                                xlog("failed to save registration!
($$ci=$ci)\n");
                        }
                        exit;
        }
}


route[outbound]{
        t_relay();
        exit;
}

route[nat_test_and_correct] {
        if ((method=="REGISTER|SUBSCRIBE|INVITE") && !has_totag() &&
client_nat_test("3")) {
                nat_keepalive();
        }
        if (client_nat_test("3")) {
                force_rport();
                fix_contact();
        }
}


-- 
A human being should be able to change a diaper, plan an invasion, butcher
a hog, conn a ship, design a building, write a sonnet, balance accounts,
build a wall, set a bone, comfort the dying, take orders, give orders,
cooperate, act alone, solve equations, analyze a new problem, pitch manure,
program a computer, cook a tasty meal, fight efficiently, die gallantly.
Specialization is for insects.
---Heinlein
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