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application-level gateway-Computer Definition. A proxy server that inspects packets at the application layer. However, proxy servers must be manually configured, whereas application-level gateways (ALGs) typically perform their functions automatically. See SIP ALG and proxy server.
Objective. Application Level Gateway (ALG) facilitates the Session Initiation Protocol (SIP) to support address and port translation as it allows the Network Address Translation (NAT) traversal to be plugged into the gateway.By doing this operation ALG allows SIP to operate through NAT.heck Enable to enable this feature or uncheck Enable to disable the SIP ALG features. If this feature is disabled, the router blocks all the incoming calls to the User Agent Client (UAC). The UAC is a client application which uses a network protocol to have communications between both ends of the communication session.