[OpenSIPS-Users] Is fix_nated_contact() useful when proxy and callee is behind NAT?

[Rodrigo Pimenta Carvalho]

Hi Bogdan.


Thank you very much for the hint! I got more another explanations here too and I was able to conclude the following:


To be sure the traffic sent out by opensips has the public IP and not the local private one, I will set a stun server in the softphone behind the NAT. In this case, such softphone will send SIP messages (that has Contact header field) already considering the public IP. I guess this solution will be enough for my case.


I can't set advertise_address and advertise_port, because my project will have lots of copies, to be installed in lots of homes. In every home, there will be a different public IP (and another private too).


Today I will configure a NAT device, put it in my network, bind the proxy and sofphone to behind it and execute some tests.


Best regards.



RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979


________________________________
De: Bogdan-Andrei Iancu <bogdan at opensips.org>
Enviado: quinta-feira, 7 de janeiro de 2016 12:43
Para: OpenSIPS users mailling list; Rodrigo Pimenta Carvalho
Assunto: Re: [OpenSIPS-Users] Is fix_nated_contact() useful when proxy and callee is behind NAT?

Hi Rodrigo,

If opensips is behind NAT, you should not use the nat related modules (as the incoming traffic is correct from nat perspective, as originating from public network). What you need to do is to be sure the traffic sent out by opensips has the public IP and not the local private one. For this, look at :
    advertise_address
    advertise_port
(http://www.opensips.org/Documentation/Script-CoreParameters-2-1#toc25)
[http://www.opensips.org/pub/skins/opensips/images/logo2.jpg]<http://www.opensips.org/Documentation/Script-CoreParameters-2-1#toc25>

openSIPS | Documentation / Core Parameters - 2.1<http://www.opensips.org/Documentation/Script-CoreParameters-2-1#toc25>
www.opensips.org
This section lists the all the parameters exported by OpenSIPS core for script usage (to be used in opensips.cfg) This document is for OpenSIPS 1.12.x



And be sure you have do port fwd of the SIP port from the public address of the NAT to the private IP of your opensips.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 07.01.2016 13:30, Rodrigo Pimenta Carvalho wrote:

Hi.


I have read the entire OpenSIPS' documentation about how to deal with NATs.

I found ways of dealing with messages from client that is behind NAT. OpenSIPS can fix Contact headers fields and registers, when SIP messages comes from clients and cross NATs before reaching this proxy.


However, my OpenSIPS and callee is behind NAT, not the client. That is, if a client (caller) calls the callee, how could OpenSIPS with its functions fixes Contact header fields in responses that go from callee to caller, so that the client will be able to send ACKs? It is still obscure to me.


Any idea?


Best regards.


RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979



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