[OpenSIPS-Users] mhomed OpenSIPs behind NAT - How to control NAT IP

[Johan De Clercq]

Antonias,
yes you can.  You need to if then else the stuff.  if $si==1.2.34 then use
nat

                        else don't use nat.

Note, not only for opensips headers, but you will also need different flags
for rtpengine.



Op wo 2 apr 2025 om 11:35 schreef Antonios Psaras <apsaras at microbase.gr>:

> Dear all.
>
>
>
> I have the following setup.
>
>
>
> OpenSIPs Server has two interfaces (DMZ / LAN). DMZ is behind NAT. RTP
> Engines is also configured.
>
>
>
> Everything was fine until an end point with in DMZ asked for SIP Trunking.
> The issue here is that if DMZ Client tries to connect to OpenSIPs DMZ
> interface, OpenSIPs will reply with NAT IP on SIP body as well as NAT IP on
> SDP.
>
>
>
> My thought is to create an other socket on DMZ interface with a different
> port without NAT configuration and ask the DMZ Client to connect on that
> interface. That will required extra configuration per peer as I will need
> to specify the preferred communication socket ie on load balancing
> configuration. Moreover I should configure a new RTPEngine Service without
> NAT configuration and route those calls to that one.
>
>
>
> Most probably the above scenario will work but I am looking for any
> alternatives to minimize configuration and complexity.
>
>
>
> Is there any way to control the usage of NAT IP on OpenSIPs script. Ie if
> source IP is with in DMZ do not send NAT IP in SIP Headers.
>
>
>
> Regards
>
>
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