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ADSL2+ Gateway with VoIP
The Applications & Gaming - ALG Tab
ALG
Some protocols and applications require special handling of the IP payload to make them work with network
address translation (NAT). Each Application-Level Gateway (ALG) provides special handling for a specific protocol
or application. A number of ALGs for common applications are enabled by default.
Application. The following applications are available:
• FTP (File Transfer Protocol)
• IRC (Internet Relay Chat)
• MMS (Multimedia Messaging Service)
• RTSP (Real Time Streaming Protocol)
• SIP (Session Initiation Protocol)
• TFTP (Trivial File Transfer Protocol)
Destination Port. The port value is displayed and can be modified. The Default button will return the port value
to the default setting based on the application.
Protocol. The appropriate protocol is listed, based upon the application type.
Enabled. When selected, the ALG feature is enabled for the specified application.
When you have finished making changes on this tab, click the Save Settings button to save your changes, or
click the Cancel Changes button to undo your changes.
Chapter 6: Configuring the ADSL2+ Gateway
The Applications & Gaming - ALG Tab
Figure 6-37: ALG
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