We're connecting to a static IP provided by our ISP
We've enabled DHCP
We're trying to port forward a number of ports to a single internal IP

We have followed instructions
We've talked to support, they say we configured correctly.

Most ports are for outside access to our system.
The significant ports that are used for in and out are ports 5060-5061 which are used for SIP trunks..

We have a cheapie router that works fine. We just set this up for a test on our syste before we configure them for customers and send them out.

Your question about pinging, yes we can ping and we can connect to the router.
Your question about enabling port forwarding,, There is no or I can't find any spot where port forwarding is enabled.

There are services that point to ports and inbound rules that point those services to internal IP addresses.

If there's something missing, please advise.

As I said, two out of box not working ???