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

[Antonios Psaras]

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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