If the IPX-2100 is before router, to resolve the problem, please set up IP address as shown below:
Click【Advanced】->【Option】->【Global SIP Settings】:
| Item | Explanation |
| External IP | External IP or domain to replace the device IP |
| External Host | External domain to replace the device IP. |
| External Refresh(sec) | Refresh time, default is 10 seconds |
| Local Network Address | IP address and subnet mask needed to be converted. e.g. 192.168.1.100/255.255.255.0 |