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1.
Please uncheck Disable registration from WAN from the IP PBX >> PBX System
>> SIP Proxy Setting page.
2.
Then open IP PBX>>Extension. Click any one of the index numbers.
3.
Now, you will get the following setup page for an extension. Note that the Allow
Registration from option has two check boxes, one for WAN and the other for VPN.
These two options are disabled by default, which means this extension is not allowed
registration from the interface you choose (e.g., WAN, VPN). This is applied to all
extensions by default.
For getting the highest network security, please check VPN only.
VigorIPPBX 2820 Series User's Guide
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