ZyXEL Communications VPN Series Handbook page 414

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Set Up the SIP ALG
Go to CONFIGURATION > Network > ALG, and check "Enable SIP ALG". Also, check the
"Enable SIP Transformations" if the SIP content which is needed to be transform. Then
click "Apply".
CONFIGURATION > Network > ALG
Direct-media and Direct-signalling are activated after ZLD 4.25. We can use the CLI to
show the status. When the two options are yes, it will change the original sip alg
behavior.
direct-siginalling will expect incoming calls from register only.
direct-media will expect media streams between signalling endpoints only.
Test result
Connect SIP phone to the USG, and check the register status. Register successfully.
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