[OpenSIPS-Users] Multiple sites - Registering and NAT'ing issue -- Best options for implementing

[Bogdan-Andrei Iancu]

Hi Josh,

Things are not simple here - basically you have to configure your 
platforms to communicate with the public internet (as the two sites can 
talk only via the public internet). SO, you have to configure OpenSIPS 
and RTPproxy to do SIP and RTP bridging between local private network 
and the public network.

Again, I say this considering that there is no way for the 2 sites to 
exchange traffic directly.

Regards,

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

OpenSIPS Bootcamp 2017, Houston, US
   http://opensips.org/training/OpenSIPS_Bootcamp_2017.html

On 07/12/2017 03:30 PM, Josh S. via Users wrote:
> Hi all,
>
>
> We've got two twin sites sitting behind nat in different private 
> networks, by twins I mean they both have the exact same config.
> UACs can register only once at any site, also they can move between 
> sites and place calls. (just locally though)
> Each opensips instance registers the local UACs.  Opensips version is 2.3
> RTTProxy is integrated, and running just fine.
>
> UACs are being registered into the twin remote instance using 
> t_replicate("sip:IP:PORT")   (although I'm not sure whether this is 
> the best method to achieve this)
>
> So, the   opensipsctl ul show  command shows:
>    AOR:: 100
>                 Contact:: sip:100 at 192.168.1.2:12345;ob
>    AOR:: 101
>                 Contact:: sip:101 at 11.22.33.44:5060;ob
>
> and in the other site, same command shows:
>
>    AOR:: 100
>                 Contact:: sip:100 at 22.33.44.55:5060;ob
>    AOR:: 101
>                 Contact:: sip:101 at 192.168.1.3:54321;ob
>
> being 11.22.33.44 and 22.33.44.55 the public IP address of each 
> opensips registar.
>
> Each opensips instance is working ok with the stock config, and the 
> UACs on its private internal network can make calls between each other.
> But of course not to the UACS on the remote site. And that is the issue.
>
> So I started to play around with nat_tranversal, nathelper, 
> topology_hiding, and reading all the many info in the docs/modules and 
> what not, and in this list of course.
> I also tried the b2bua module, to no avail.
>
> I reached to an end route where progress is not made-....  I began to 
> think this cannot be that complicated. I refuse to play 'inventing the 
> wheel' again game.
>
> I need some little help in finding the right direction to get the two 
> sites routing calls between each other.
> Any hint would be greatly appreciated, guys.
>
>
> Just for clarifying purposes, a little drawing
>
>
>
>                         Private Net Site A                         
> Public IP side
>
> UAC1    |
>              -----------------------------------------------> OpenSIPS 
>                     11.22.33.44
> UAC2    |                                    |
>                                                  |
>                                                  |
>                                                  | <-------> RTTProxy
>
>
>
>
>
>                         Private Net Site B                         
> Public IP side
>
> UAC3    |
>              -----------------------------------------------> 
> OpenSIPS                     22.33.44.55
> UAC4    |                                    |
>                                                  |
>                                                  |
>                                                  | <-------> RTTProxy
>
>
> it's required that the UACs can move around to any site, same username 
> (uri), and still be reachable from any other point.
>
> from stock config, I made the slight changes to allow for RTTProxy be 
> integrated, and it's working. No NAT was involved, as yet.
> The two sites share the same domain, and also the same internal IP 
> network in 192.168.1.0/24 space,
> although that can change if needed.
> Each site works fine individually.
>
> What changes need to be done in the config for the calls be routed 
> between the two sites?
> Any example around?
>
> Thanks a lot.
>
> Josh Smit
>
>
>
>
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