What is SIP_ALG?
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SIP_ALG (Session Initiation Protocol_Application Layer Gateway) is often the root cause of problems using modern VoIP solutions.  Whether you are experiencing one-way voice, calls cutting out, handset not ringing as expected, or devices failing to connect or register correctly, SIP_ALG is one thing you need to be aware of.

Here is an explanation of what it is, why it was implemented in the first place, why it should be disabled on most modern VoIP networks.