ALG Handling of H323
An H.323 ALG is a combination of a H.323 gatekeeper and a H.323 proxy. Such an ALG presents the only visible media endpoint, and all other endpoints communicate with it to route calls to their final destinations. The ALG, especially the gatekeeper, may deploy filtering rules, specifying which functionality is allowed within the H.323 network.
This is a solution that minimizes the exposure of a H.323 network and allows minimal connectivity from untrusted networks to the ALG itself.
Depending on the H.323 proxy implementation, latency and throughput of media sessions may become an issue.
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