Hi Matteo,
I remember to had a similar setup and it wasn’t a problem for me.
I did have this the configuration running with an older version of Kamailio 5.2
or so but I did configure the following for the path module on the edge proxy:
/* ----- path params ------------------------------------------------------- */
modparam("path", "use_received", 1)
modparam("path", "enable_r2", 1)
modparam("path", "received_format", 1)
route [CALLER_NAT_DETECT] {
force_rport();
if (nat_uac_test("27")) {
if (is_method("REGISTER")) {
add_path_received();
} else if (is_first_hop()) {
set_contact_alias();
}
setflag(FLT_NATS);
} else if (is_method("REGISTER")) {
add_path();
}
}
And on the registrar:
modparam("registrar", "path_mode", 1)
modparam("registrar", "path_use_received", 1
It was from an old setups but maybe it does help.
Greetings
Rick
> On 17. Jul 2022, at 11:05, matteo brancaleoni <mbrancale...@gmail.com> wrote:
>
>
> Hello,
>
> I'm trying to setup the following scenario with sip ping:
>
> UAC -> Kamailio Edge -> Kamailio Registrar
>
> Edge proxy is a multihomed proxy with public/private ips and the registrar is
> a kamailio on a private network. The edge acts as a nat proxy and
> loadbalancer.
>
> Edge proxy inserts a Path header (and contact alias) which get correctly
> saved on registrar usrloc. Registration works as expected.
>
> Now, since I need to keep nat open towards the uacs and expire them when
> they're not reachable anymore, I'm trying to send sip pings from the
> registrar via the edge proxy. I'm using nathelper sipping in the registrar.
>
> What I see is that the registrar sends out a sip options putting in the Route
> header the Path as expected, but the sip packet gets sent directly to the UAC
> contact and not via the edge, as the Route header specifies.
>
> After looking into the nathelper code, it seems that the sip packet is sent
> via udp directly without any specific routing. So the question: it should
> work what I'm trying to achieve? Maybe not?
>
> Probably I can work around it setting the ;received in the contact on
> registrar (it will set to the edge proxy) and since the contact is aliased on
> the edge when the edge receives an option from the registrar it can process
> the alias and send it to the correct endpoint, but seems a workaround?
>
> Or using the keepalive module maybe, even if that means setting specific
> timers and manually do what the nathelper module already does?
>
> Any hint?
>
> Thanks,
> Matteo
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