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Use the same method as Step 1 to do port forwarding in router-B for ZX20-B as above.
Setp4:
Combine two ZX20 and make calls
Accordingly, set the 601 users in ZX20-A and 801 users in ZX20-B, and build the correct
dial rules as above, you can make calls between two the ZX20 IP PBX.
Note:
You can also apply a DDNS to get one fixed domain for both ZX20 IP PBX and
connect to each other rather than using the Port Forwarding in the router.
7.4 How to resolve problems about hearing on one side only
If your IP PBX is behind the Router, you should build an IP Address Map to resolve this
problem as below:
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Advance
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Options
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Global SIP Settings
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NAT Support
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External IP Replace your external IP address as your public IP or domain
External Host Replace your external IP address as your public IP or domain
External Refresh Set time for refresh, default is 10
Local Network Address Replace your local network address and mask