Planet IPX-330 - How to Resolve the Problem about Hearing One Side Only

Internet Telephony PBX System
IPX-330/IPX-2100
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received from RJ11 port of router (192.168.1.100:4569) will be sent to IPX-2100-A
Now, take the web management panel of ADN-4102 router as an example.
In here both UTP and TCP must open for IP PBX.
Step2: IPX-2100 Configuration
Configure the trunk and dial plan on IPX-2100-B, and register IPX-2100-B IP to IPX-2100-A.
The configuration is the same as the above, but you have to replace the public IP address with
the internal IP: 192.168.1.21.
Step3: Configure port mapping rule of IPX-2100-B on the router
Configure port mapping of IPX-2100-B on the router according to Step1.
Step4: Connect two sets of the IPX-2100 and make the call
Create extension 601 on IPX-2100-A, extension 801 on IPX-2100-B, and create the correct
outbound rule.
Public IP must be provided by network provider. It could be dynamic IP address, and
easy to change; you can resolve this problem by using DDNS.
8.3 How to resolve the problem about hearing one
side only
If the IPX-2100 is behind router, to resolve the problem, please set up IP address as shown