On 7 January 2013 15:45, Klaus Darilion <klaus.mailinglists@pernau.at> wrote:

Hi all!

On 04.01.2013 18:57, Ovidiu Sas wrote:

Hello Klauss,

I use record_route_preset for this kind of scenarios:
http://kamailio.org/docs/modules/3.3.x/modules_k/rr.html#id2550086
That was the main reason that I enhanced record_route_preset with the
second parameter (see the Note on string2).

I haven't tried your idea with two sockets. Let us know if it's working.
If you need to use the same port on the internal and external
interface, you could add a new IP to the host and listen on two
sockets on the same port and force the socket when sending a request
out.
listen=udp:10.10.0.2
listen=udp:10.10.0.3 advertise pu.bl.ic.ip

I did some basic tests (incoming, outgoing, on/off-hold). The service provider's SIP trunk was an Asterisk with NAT traversal disabled. Kamailio was NATed 1:1 to the public IP address (exclusively, without port translation). I tested Kamailio only doing near-end NAT-traversal (taking care of its own NAT).

I used two IP addresses for the two sockets, but I must works also with a single IP address and different ports.

Conclusion: works :-)

Following is the setup how I tested it (if you need to add far-end NAT traversal (SIP clients behind another NAT) then it will more complex).

regards
Klaus

# Service Provider for SIP Trunk: 5.5.5.5
# public IP address of Kamailio/rtpproxy: 3.3.3.3
# rtpproxy binds to 10.10.0.3
listen=udp:10.10.0.2
listen=udp:10.10.0.3 advertise 3.3.3.3:5060
mhomed=0

route[RELAY] {
if (src_ip == 5.5.5.5) {
force_send_socket("10.10.0.2");
rtpproxy_manage("","10.10.0.3");
} else {
force_send_socket("10.10.0.3");
rtpproxy_manage("","3.3.3.3");
}
...
t_relay();
}

onreply_route {
if (src_ip == 5.5.5.5) {
force_send_socket("10.10.0.2");
rtpproxy_manage("","10.10.0.3");
} else {
force_send_socket("10.10.0.3");
rtpproxy_manage("","3.3.3.3");

}
}

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