Elastix 2.x / secondary subnet through VPN Tunnel

Trying to setup a grandstream dp715 on a remote subnet through a VPN tunnel. So far, having no luck. I set both firewalls to allow VOIP traffic through the tunnel but I can’t get Elastix to see the remote subnet…

Have also tried to set the extra subnet in FreePBX… No dice…

Do your localnet setting in SIP SETTINGS include the VPN addresses? If not, there’s your problem.

The VPN is a firewall to Firewall VPN tunnel…
I have listed the extra subnet in LAN configuration but It won’t discover the endpoint on the external subnet