Hi George,

i use something like that (shameless stolen from other configuration files within request-route).

Thats for answering options to my internal kamailio.

But Alex Balashov wrote an nice blog poste about NAT/OPTION Pings

with kamailio: http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-definitive-guide/

### only initial requests (no To tag)
if (is_method("OPTIONS"))
{
if (uri=~"sip:.*[@]+.*") {
sl_send_reply("501", "Not Implemented");
}
else {
options_reply();
exit;
}
}

Cheers Karsten

Am Do., 4. Juli 2019 um 10:29 Uhr schrieb George Diamantopoulos <georgediam@gmail.com>:

Hello all,

I've been trying to handle OPTIONS statelessly, but proper handling fails for UACs behind NAT without ALG. I thought I'd overcome this by setting the $du pseudovariable, but apparently I'm missing something. The following does not work:

if ($Rp == "6050") {
force_send_socket(udp:10.10.10.10:6050);
}
$du = "sip:" + $si + ":" + $sp;
sl_send_reply("200","OK");
exit;

I'm now realising that I put this in request_route() so force_send_socket() and $du have no use whatsoever, since the request is not forwarded anywhere. Is this the reason?

So the question is, how can I do the following things for a stateless reply: a) choose a sending socket for the reply and b) change the destination for the reply to something other than the URI in the first Via header.

Thanks!

BR,
George
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