Before you can configure access control rules for reverse connections and cross-connections, these
requirements must be met:
The network tunnel service must be running on the appliance. On the Services page in AMC, check the
status for Network tunnel service; it should be Running.
An IP address pool for the network tunnel clients must be configured. See Configuring IP Address Pools
for information on how to set one up.
Users who have access to a VoIP application must belong to a community that is configured to deploy the
network tunnel clients (Connect Tunnel or OnDemand Tunnel) to their computers. See Creating and Configuring Communities.