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ALG stands for Application Layer Gateway. An ALG understands the protocol used by the
specific applications that it supports (in this case SIP) and does a protocol packet-inspection
of traffic through it. When the ALG option is turned on in the gateway, gateway will re-write
information within the SIP messages (SIP headers and SDP body) making signaling and
audio traffic between the client behind NAT and the SIP endpoint possible. This page
provides an option to enable or disable the SIP ALG support.
Click on the Application tab, and then click on SIP ALG tab. The page displays an option to
enable or disable the SIP Application Layer Gateway. The user can click on the button to
enable or disable the ALG support.
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