The Signaling Firewall feature provides network security for Diameter networks in LTE domains. This feature configured with firewall rules by the System OAM only operates on DA-MP servers. When you enable or disable a diameter or RADIUS connection, a notification is sent to the servers to update the firewall rules to allow or disallow incoming network traffic.
Note:
In new DSR installations, the Signaling Firewall is enabled by default; however, during a DSR upgrade without the feature, the Signaling Firewall is disabled by default. Otherwise, it uses the setting from the previous release.