[Users] openser and proxy

Hello,

I have an ADSL internet connection which goes to a router.

From the router I have a linux machine with openser installed,

and a econd connection goes to a LAN. Openser IP address = 192.168.100.106 and I have a public IP (82.104.xxx.xxx)dedicated to this address. There is no restriction to any port. I thought it was enough to be seen from outside, but unfortunately, when I try to register any softphone, the registration fails.

There is no way to let it work? Should I put openser on internet before the router?

Thanks Alessandro

I have a openser installation which has an IP address = 192.168.100.106. To be reachable from softphones outside the proxy