These adapters are usable for FAX, some alarms, and most other analog devices. They effectively replace an analog line for most needs. We do not fully support these with remote configuration, but they do work when properly set up.
First, find the IP address of the ATA. You can do this with a network scanning tool, or via the analog port with any analog phone. Just dial ***1 and it will read the IP address for you. Then connect to it in a browser. Change the settings below. Be very careful changing any other settings as they may conflict. Save, then reboot.