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Disable SIP ALG on AT&T router

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1. Connect to the Network

To access the gateway’s settings, you will need to use a computer (or mobile device with a web browser) connected to the same network.

On the back of your AT&T gateway, you’ll find a label with network information on it.

2. Open a browser and go to (Advanced Device Configuration Address)

3. Select Firewall

4. Select Firewall Advanced

5. Enter Device Access Code (Located on Gateway label)

6. Turn Off SIP ALG and Save the changes