Hi Henning, Joel, 
Thanks for your valuable input.

 One of our setup for production looks like below for around 1 million users initially : 
                                                          / --------------> Kamailio  (active node, as of now private)   \
 Client -- > LB(public IP- l4 switch)--                                                                                                  ---------->Centralized database     
                                                          \ --------------> Kamailio (passive node, as of now private)  /
  

In the future, we have a plan to add another domain and allow calls between different domain.           
                                                                            
Thanks & Regards 
Pintu 

On Wed, Feb 27, 2019 at 6:47 AM Joel Serrano <joel@textplus.com> wrote:
I second that. And to add to Henning's suggestion...

We recently tested that same setup, and we found one "thing": Using advertise, you will need a second port (listen transport:ip:port) to talk to internal servers that require you to *keep* the private IP. Otherwise all outgoing request from that kamailio will have the IP replaced by whatever the advertise says and that can mess up your internal routing.

Not an issue, as I said you can configure a second port, but just something to know depending on what your setup is gong to look like.

Good luck!
Joel.

On Tue, Feb 26, 2019 at 1:28 PM Henning Westerholt <hw@kamailio.org> wrote:
Am Dienstag, 26. Februar 2019, 06:09:08 CET schrieb Pintu Lohar:
> Which one among the below option is highly recommended for setting up
> Kamailio (for production)
>   1.  Kamailio behind NAT *or*
>    2. Setting up Kamailio using public IP?
>
>  are there any disadvantages if we setup Kamailio behind NAT and use
> advertise option in listen parameters?
>
> We have tested both the options, and both the options work great for us( a.
> Kamailio behind NAT with advertising in listen parameters b.Kamailio setup
> with public IP).  So wondering which one is best and highly recommended?
>
> Some extra info :
> 1. We use TLS
> 2. Using coturn for media

Hello Pintu,

generally speaking, if you have the choice between a network setup with NAT
and without NAT (everything else equal) - my recommendation would to choose
the one without NAT. It will be easier to debug in case of problems on your
side or the client side.

Best regards,

Henning

--
Henning Westerholt - https://skalatan.de/blog/
Kamailio services - https://skalatan.de/services
Kamailio security assessment - https://skalatan.de/de/assessment

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