I have a location where I am using a WGB350 going to an ATA186 then into a standard 2500 series telephone.
Everyday the WGB will stop replying to pings, snmp requests, etc. It almost seems like it has lost power or connection. This will go on for hours then it will start replying again. The phone never loses connection though. I have been on the phone and had somebody try to ping, or http the WGB and they get request timed out. But the voice sounds perfect.