ATCOM IPPBX IP08 - IPPBX Port Forwarding Configuration; IPPBX System Settings and Updates; Changing IPPBX Administrator Password; Configuring Auto Provisioning for IP Phones

IPPBX IP08 User Manual
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9.3 Port Forwarding
When IPPBX works as a router, it can forward connections to WAN to a device connected to LAN network.
For example: user can access 192.168.10.2:80 (connected to LAN) by accessing xx.xx.xx.xx:8080
(xx.xx.xx.xx is the IP of WAN)