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  • In this scenario a static route like you are proposing is pretty much pointless as it effectively already exists. ClearOS knows that any traffic arriving at enp4s0 for any subnet other than will automatically get routed to enp2s0 while ClearOS is in gateway mode.

    Are you running any IDS/IPS or other filter on ClearOS?

    Looking at, their examples are really for configurations where the softphone in on the internet and there is nothing indicating that you need to forward anything so I am puzzled. Have you tried asking 3CX?

    I wonder if you can turn off NAT for traffic for these phones by doing something like:This is only a guess. If it works, it means the 3CX server will receive traffic which appears to come from, rather than being natted to

    If you can't get any help from 3CX you may need to start packet sniffing but I am not sure how to diagnose the issue.