Note that, as this process may temporarily interrupt your internet connection and phone service, we recommend doing this in an off-peak period or outside of business hours.
Sophos firmware upgrades can re-enable the SIP ALG feature, even if it has been previously disabled. Please take note of this before performing any upgrades
Login to the Sophos CLI using Telnet or SSH. You can also access the CLI from admin > Console in the upper right corner of the Admin Console screen.
Enter option 4 to connect to the Device Console
Execute the following command:console> system system_modules sip unload