I'm obviously new to 3cx and voip systems. So, while your response explains a lot, I think I need a deeper understanding because it seems like I am missing an important consideration. Let me make sure I get it... Please tell me if the following statement is true.
The add gateway utility is used to create the provisioning file for the gateway, it does not change settings in 3cx.
If this is true, how does 3cx know how to route calls to the gateway - how does 3cx even know the gateway is out there? If it is not true, how do you configure the gateway in 3CX after you add the gateway?
What am I missing? It seems like I should have some indication in 3cx that there is a gateway on the network and some way to configure it in 3cx.