[rybshik]

My original setup is as follows:
I have my DSL modem in bridge mode connected to router WRT54G in PPPOE mode.

My Sipura 3000 is behind the router on a **fixed local** IP address. Everything works ok.

In my setup, I need a fixed local IP address for Sipura 3000 to be able to reach it remotely over Internet (by way of forwarding a port in WRT54 to that local IP address). By the way, Sipura 3000 works perfectly with dynamically assigned local IP address, too.

My new setup is as follows:
I replace Sipura 3000 by Sipura 2100 in the same setting, i.e.I put Sipura 2100 behind the router WRT54. I know that Sipura 2100 has it’s own built-in router, but I do not want to use it.

And I noticed the following odd behavior of Sipura 2100. If I set Sipura 2100 to have dynamically assigned local IP address (assigned by my WRT54 router), everything works great. As soon as set Sipura 2100 on a **fixed local** IP address, it stops registering with most VoIP providers (it still registers with some that have outgoing proxy server). So it looks like I have the problem with NAT.

My question is as follows. Is it possible to completely disable the built-in router in Sipura 2100 and make the Sipura 2100 behave as if there were no built-in router at all? Particularly, how to make NAT work the same way it works in Sipura 3000 and other adapters without built-in routers?

I expect that Sipura 3102 has the same built-in router as Sipura 2100, so what I discuss here applies to Sipura 3102, too.