[OpenSIPS-Users] NAT issues on client and server

[Mark Currie]

Thanks for the advice Flavio.

 

Currently I am actually pretty close with my NAT'ed OpenSIPS and NAT'ed
clients. I am assuming this is because I have a simple NAT scenario with
full-cone NATs.

 

I get as far as making a call, but when I pick-up the call only one side
gets RTP through. I traced the problem to the fact that a local address is
being put in the "Record Route" section of an ACK response.

 

I would like to try to get this more controllable scenario working first
before I launch into new complexity with RTP proxies etc. I think that I
just need to know how to get the fix_nat_sip() and fix_nat_contact() to
work. Any pointers with that?

 

Regards

Mark

 

From: users-bounces at lists.opensips.org
[mailto:users-bounces at lists.opensips.org] On Behalf Of Flavio Goncalves
Sent: 03 January 2013 12:27
To: OpenSIPS users mailling list
Subject: Re: [OpenSIPS-Users] NAT issues on client and server

 

Hi Mark, 

 

There is no simple way to traverse NAT. Unless all your routers use a non
symmetric NAT, you will have to use rtpproxy or mediaproxy (you can check
this with a stun client). OpenSIPS behind NAT make things even more
complicated. So I suggest that you follow an example with rtpproxy or media
proxy and also use the OpenSIPS in a valid IP address. The setup you are
trying to do with OpenSIPS behind NAT is possible, but it is even more
complex. 




Flavio E. Goncalves

 

 

2013/1/3 Mark Currie <mark at ziliant.com>

Hi,

I have a very simple setup for a closed network of users (all NAT'ed) with
one OpenSIPS server (also NAT'ed).

I have managed to solve my first problem with registration by following
previous posts and using fix_nat_register(), but I am still having problems
with NAT issues during a call. I know that I probably need to use
fix_nat_contact() and fix_nat_sip() but I can't figure out how to use these
properly through the documentation.

I have tried to search for examples of opensips.cfg that suit my scenario
but all the ones I found are complicated with proxies etc. Can someone point
me to simple example of opensips.cfg that takes care of NAT?

Regards
Mark Currie


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