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8.2 Link two IP04 in different offices.
The generally environment for two ip04 in different location is: two IP04 are both behind router
and using the private IP.
Since the IP04 doesn’t have the public IP, so we need to do port forwarding in the router and
make IP04 is reachable to others.
Below is the port forwarding structure:
1) Set port forwarding in the router for IP04A
The IP04A is behind the router, to register to IP04A via the internet, you need to forward the IAX2
port in your router, so all the packets received on the router WAN port (202.8.16.98:4569) will be
forwarded to the IP04A (192.168.1.21:4569). Below is the setting page in a linksys router: