[sr-dev] [kamailio/kamailio] Wrong Record-Route and Via header fields when TCP is used (#2033)

[Daniel-Constantin Mierla]

Back to this one, somehow it got on the side with busy end of summer and autumn ...

I tried to reproduce, but I couldn't get the same result. In my case it worked fine with the current master branch. I made the following minimal config:

```
#!KAMAILIO

debug=3
children=4

mhomed=1

listen=tcp:192.168.56.1:5060
listen=tcp:127.0.0.1:5060

loadmodule "tm.so"
loadmodule "sl.so"
loadmodule "corex.so"
loadmodule "pv.so"
loadmodule "textops.so"
loadmodule "rr.so"

request_route {
	if(is_method("INVITE")) {
		record_route();
	}
	$du = "sip:192.168.56.1:5080;transport=tcp";
	t_relay();
}
```

The INVITE was sent to 127.0.0.1:5060 and the outgoing one from kamailio had two Record-Route headers:

```
INVITE sip:test at kamailio.org SIP/2.0
Record-Route: <sip:192.168.56.1;transport=tcp;r2=on;lr;ftag=76ff7a07-c091-4192-84a0-d56e91fe104f>
Record-Route: <sip:127.0.0.1;transport=tcp;r2=on;lr;ftag=76ff7a07-c091-4192-84a0-d56e91fe104f>
Via: SIP/2.0/TCP 192.168.56.1;branch=z9hG4bKac3f.6b055b9438495fd0fb5e6b08f07611d5.0;i=1
Via: SIP/2.0/UDP 192.168.178.8:5040;received=127.0.0.1;branch=z9hG4bKac3fd.jasefjsdfas;rport=54075
```
I also changed the order of listen parameters and the same result with two record-route headers.

Can you test again with latest master and see if you get the same result like in the past? If yes, are the two IP addresses assigned to different network interfaces/cards, or they are assigned to the same network interface?

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