Zone subnets are used to configure a gatekeeper to accept discovery and registration messages sent by endpoints in designated subnets, enhancing security of the network.
Use this procedure to add a zone subnet.
You must be in the Design View to add a zone subnet.
Expand the dial plan tree to view all components.
Select a zone to add a zone subnet to.
Click the Zone Subnets tab.
Right-click and choose Add from the menu. The Add Zone Subnet dialog box appears.
Enter the values in the following fields:
Subnet - The IP address of the subnet. The default is blank. If this field is left blank, the local gatekeeper accepts discovery and registration requests from all subnets.
Mask - The subnet mask. The default is zero. Values must be between 0 and 32.
6. Click Apply to apply the values and add a new zone subnet.
Click Cancel to cancel the procedure.