Add Remote network via VPN

I want to know if its possible to have Freepbx configured with a WAN Adress , and add a second network card with a local subnet to connect to a remote location via a VPN tunnel.

ETH 0 = (ISP static IP)
ETH 1 = (Subnet to connect to a VPN)

VPN go through a IPSec site to site VPN Tunnel,
Remote location :

I try to setup that way, but we cannot access to direct IP (Eth0) when the ETH1 is enable…

Does anybody have an Idea how to work with 2 Network card on freepbx?

Nothing to do with FreePBX, if you have more than one network interfaces you will need to set up routing and possibly NAT forwarding as appropriate on those interfaces

Google will help you here