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Here are the SIP settings for SonicWall Firewalls.
One-way audio becomes a frequent issue if not properly set.

Some SonicWalls use 'Enforced Client Anti-Virus' from McAfee. If a device attempts to reach the internet, it insists that the device download and install the McAfee client software. Ensure you exempt the address of the Base unit from any enforced antivirus requirements.