How to combine two IPX-2100 IP PBXs in a different network ?

Normally, two sets of the IPX-2100 are located in different places with different IP addresses for Internet access.

For external line configuration, you must use public IP address.
Take the following instructions as an example:

Register the IPX-2100-B IP to a trunk of the IPX-2100-A with authentication.
Configuration Rule:
1. IP Phone registers on the IPX-2100-A as extension 601.
1. Another IP Phone registers on the U50-B as extension 801.
2. IPX-2100-A IP:192.168.1.100.
3. IPX-2100-B IP:192.168.1.200.
4. Extension format of IPX-2100-A: 6XX.
5. Extension format of IPX-2100-B: 8XX
6. Create an extension 888 with password 123456 on the IPX-2100-B.
7. All extensions on the IPX-2100-A can call extensions on the IPX-2100-B with format 8XX.
8. All extensions on the IPX-2100-B can call extensions on the IPX-2100-A with format 6XX.

For detailed steps, please take chapter 8.2 as reference.

Two sets of the IPX-2100 before router

Sometimes the IPX-2100 doesn’t have a public IP address, and you have to configure port mapping for your router.

Step 1: Configure the mapping rule of the IPX-2100-A on the router.
The IPX-2100-B is connected behind the router, and registers on the IPX-2100-A through internet. You need to configure the port mapping of IAX2 port (4569) on the router. Then, all data received from eth0 port of router(192.168.1.100:4569) will be sent to the IPX-2100-A.

Now, take the web management panel of the AND-4100 router as an example.
In here both UTP and TCP must open for IP PBX.

Step 2: IPX-2100 Configuration
Configure the trunk and dial plan on the IPX-2100-B, and register the IPX-2100-B IP to the 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.

Step 3: Configure port mapping rule of the IPX-2100-B on the router
Configure port mapping of the IPX-2100-B on the router according to Step 1.

Step 4: Connect two sets of the IPX-2100 and make the call
Create extension 601 on the IPX-2100-A, extension 801 on the IPX-2100-B, and create the correct outbound rule.

Note: 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.