Grandstream GXW-410X gateway configuration

I recently purchased one of the GXW-410X gateways and have been trying lots of configurations to get it to work with the Asterisk system (none have been successful ).

Has anyone been able to get this to work? and if so, would you be willing to share the basics of your configuration? Is the gateway defined as a ‘custom voip provider’?

I have two analog lines that I’m plugging into the gateway on FX0 and FX1. The Asterisk system is running version 1.4.0 with the Asterisk-GUI administration screens. I did not load zaptel module (is it needed?) Gateway, Asterisk server and SIP phones are all inside a LAN (,,… respectively)…

The SIP phones can dial each others extensions, but no inbound/outbound calls via the gateway.

Thanks in advance