Problem with t_relay() and VPN tunnel - sr-users

6 Aug 2010

Hi,

I have two SIP servers, *A* and *B*, connected each other though a OPENVPN
tunnel. The server *B* needs to t_relay() every SIP message containing the
method MESSAGE to the server *A* but these messages never reach destination.

I have tested the tunnel connectivity and works fine. I wrote a Perl script
(located in *B*) that sends SIP MESSAGES to Kamailio (located in *A*) trying
to figure out what is happening but these messages are received by *A* and
processed correctly but when *B* does the same from Kamailio, it is never
received.

Here is the route part of kamailio.cfg in *B*:

Observation: ($rU == "1004") result is *true*
*
 if(is_method("MESSAGE"))
 {
            if($rU == "1004")
             {
                        xlog("L_INFO","En 1004");

                        rewritehost("10.8.0.1");

                        if (!t_relay())
                                xlog("L_INFO","MIO Error en
t_relay");

                        t_reply("200", "Ok");
                        xlog("L_INFO","MIO despues rewrite");
                        exit;
             }
.....*

The perl script that WORKS:

*$msg = 'MESSAGE sip:1004@192.168.1.2:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.1.2
From: "2002" <sip:2002@192.168.1.2
&lt;sip%3A2002(a)192.168.1.2&gt;&gt;;tag=1837944796
To: <sip:1004@192.168.1.2 &lt;sip%3A1004(a)192.168.1.2&gt;&gt;
Call-ID: 19722852989(a)192.168.1.2
CSeq: 15773 MESSAGE
Contact: <sip:2002@**PublicIP-protected**:5060>
Max-Forwards: 29
User-Agent: DBL
Content-Type: text/plain
Content-Length:    34

+595981[protected]
hello from kamailio
';

use IO::Socket;

my $sock = IO::Socket::INET->new( Proto=>'udp',
                                  PeerHost=>'192.168.2.102',
                                  PeerPort=>'5060');

print "Sending msg $msg\n";

$sock->send($msg) or die "error sending $!\n";

*Please help!

Thanks in advance.

Carlos.