[SR-Users] SIP OPTIONS

[Benjamin Henrion]

On Wed, Jan 15, 2014 at 10:06 AM, Daniel-Constantin Mierla
<miconda at gmail.com> wrote:
> Hello,
>
> if you just want to send a 200 ok for OPTIONS, do:
>
> if(is_method("OPTIONS")) {
>   send_reply("200", "OK");
>   exit;
> }
>
> You can also add condition on IP of the trunk gateway, like:
>
> if(src_ip==_GW_IP) {
>  ...
> }

On that OPTIONS ping topic, I hit a bug recently with Kamailio 3.3
running on 2 ethernet interfaces (one public, one private).

It seems the OPTIONS ping has always an SRC_IP of the first listen
interface defined in kamailio.cfg, while the machines on both sides
expect an SRC_IP which is in their range.

I had to fix it with some iptables glue to rewrite the SRC_IP with:

iptables -t nat -A POSTROUTING -p udp --dport 5060 -s my_public_ip/32
-d private_ip_of_the_destination/32 -j SNAT --to-source
my_private_ip/32

Any idea if this could be fixed within kamailio?

Best,

--
Benjamin Henrion <bhenrion at ffii.org>
FFII Brussels - +32-484-566109 - +32-2-4148403
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