Configure SIP ALG on your modem

Session Initiation Protocol (SIP) is a communication protocol used in VolP networks. SIP ALG (or Application Layer Gateway) refers to a Network Address Translation (NAT) tool that enables or disables the ability of the modem to pass SIP sessions to the local area network (LAN).
Modem Advanced Step 1-4

1.  Connect a device, such as a computer or tablet, to the internet through WiFi or using an Ethernet cable connected to your modem.

2.  Open a web browser and type http://192.168.0.1 into the web address field.

3.  Log in to the modem's online user interface (Modem GUI) using your Administrator Username and Administrator Password. Unless you have changed the default settings, you can find this information on the modem's sticker. Note that these are different from your wireless SSID and security key.

4.  Select "Advanced Setup."

5.  Select "SIP ALG" in the left sidebar. 

6.  Enable/Disable SIP ALG, and click "Apply" to save your changes.

You can also view the full SIP ALG Session List at the bottom.

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