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SIP ALG is a feature often enabled by default on many commercial routers and firewalls. While designed with good intentions, in the world of VoIP and softphones, it frequently causes far more problems than it solves.
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If you’ve ever encountered one-way audio, dropped calls, or registration failures in your VoIP deployment, there’s a good chance SIP ALG is the cause. Often enabled by default on routers and firewalls, SIP ALG tries to help — but usually makes things worse.
Let’s unpack what SIP ALG is, why it causes problems, and how to turn it off.