SMC Networks SMCD3GN3 Administrator User Manual page 110

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By default, the Gateway's firewall settings are enabled. To disable the firewall, uncheck
Enable Firewall Module and click Apply. Disabling the firewall hides the submenus below
the Firewall menu.
The Security Settings (Firewall) menu also provides an option for enabling or disabling the
Session Initiation Protocol (SIP) application-layer gateway service on the Gateway firewall.
This option allows SIP signaling requests to traverse directly through the Gateway to the
destination device.
Figure 56. Security Settings (Firewall) Menu
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SMCD3GN2 Wireless Cable Modem Gateway Administrator Manual