Sorry to say this, but as you can’t get the basic setup with SIP trunks between two CMs to work it’s not worth trying to get a connection via a gateway, or multiple, that acts like an SBC to work as it’s a much more complex situation.
Again if you share the requested information we can help you. Without it I’m afraid that we will not get anywhere with this. So far what you share doesn’t help narrowing down the issue and you’re not very clear in what you write. All this is at the moment working against you. Sorry to say that, but we cannot help you if you persist to withhold the information requested.
