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Configure SIP ALG on your ZyXEL C3000Z modem

SIP ALG enables or disables the ability to pass SIP sessions to the LAN.
Modem Advanced Step 1-3
  1. Connect a device directly to your modem.
  1. Open a web browser and go to http://192.168.0.1.
  1. Login to your modem by entering the Admin Username and Admin Password, then select "Apply." If your modem is using the default settings, this information is located on the modem sticker.
Learn more about password security best practices.
  1. Select "Advanced Setup."
  1. Select "SIP ALG."
  1. From here you can view or edit the "SIP ALG" settings.
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