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In modern VoIP systems, a SIP proxy plays a central role in managing secure, scalable communications. This article explains what a SIP proxy is, how it works, and why it’s essential for VoIP security.
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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.