Specifications

MyPBX Standard Administrator Guide
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Figure 1-4
Note: A strong password is a MUST for remote extensions.
1.2.3. IP restriction for extensions
You can find this setting in
PBXExtensionsFXS/VoIP Extensions VoIP ExtensionsGeneralPassword
When it’s configured, only the permitted IP can register this extension. All the
other registry requests will be denied.
The format is “IP address/Subnet mask”, e.g. 192.168.5.136/255.255.255.255.
In this way, only 192.168.5.136 can register this extension 6010.
Figure 1-5