Application Layer Gateway

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An Application Layer Gateway (ALG) is a Session Initiation Protocol (SIP) Back to Back User agent (B2BUA). An ALG can be used to allow firewall traversal with SIP. If the firewall has it's SIP traffic terminated on an ALG then the responsibility for permitting SIP sessions is passed onto the ALG instead of the firewall. An ALG can solve another major SIP headache and this is NAT traversal. Basically a NAT with inbuilt ALG can rewrite information within the SIP messages and can hold address bindings until the session has been terminated.

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[SIP gateway built with libipt/iptables].

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Application Layer Gateway

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