PLANET IPX-1980 - Manual (Page 82)

z Extern IP Replace with your external IP address this your public IP or domain
z Extern Host Replace with your external IP address this your public IP or domain
z Extern Refresh Set time for fresh, default 10
z Local Network Address Replace with your local network address and mask
z NAT mode If your IPPBX behind the Router, set default yes
5. If your settings are accomplished, now you can try to register one extension.
We try our phone and soft phone eyebeam.
1) If your phone is behind the router, and you must open the NAT for your extension.
Usually we open it.
Like:
82