[SR-Users] Kamailio server behind NAT

[Sergey Safarov]

I prefer to use two NIC
1) with public IP;
2) with private IP.

Both NICs use routers as a gateway.
On Linux need to configure policy routing.

Probably you may want to use topos or topoh modules.


On Wed, Feb 9, 2022 at 7:14 PM Tihomir Culjaga <tculjaga at gmail.com> wrote:

> Hi all
>
>
> I'm wondering what is best practice to configure kamailio for a setup
> shown below. Carriers only support interconnection over a private network
> so I need to terminate every separate network on kamailio machine (and on
> RTPEngine) . That will turn very quickly into an administration nightmare
> as we add more and more carriers.
> My plan is to terminate carrier private networks on a router and NAT the
> traffic to kamailio where it leads me to a kamailio behind NAT setup. Well,
> in theory set_advertised_address and set_advertised_port per message can do
> the trick... at least I hope.
> Also, some carriers require a SIP registration to activate SIP trunks. I
> do that using UAC module (remote registration) but here again I got a
> problem with contact address as you can set only one contact address
> (modparam("uac", "reg_contact_addr", "10.1.1.11:5060")).
>
>                     /--RTP 10000-19999-- RTPEngine1 -----RTP------+--
> IPPBX1
> carrier1 --- NAT ---|                       |                     |
>                     |                       |                     |
> carrier2 --- NAT ---+-----SIP 5060------ kamailio ----SIP---- Dispatcher
>                     |                       |                     |
> carrier3 --- NAT ---|                       |                     |
>                     \--RTP 20000-29999-- RTPEngine2 -----RTP------+--
> IPPBX2
>
>
> So bottom line, I'm wondering what would be the best practice for such a
> scenario ?
> That would spare me from hitting many pitfalls.
>
> Would really appreciate a hint.
>
> Regards,
> Tihomir.
>
>
>
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