Just a heads up on this.... The support staff at VOIPo flashed a new firmware to my ATA unit and I haven't had any issues yet, but it's only been a few days. They confirmed my router setup was correct. If the problem persists, then I might try setting up a DMZ for this ATA unit.

I don't have any other connection issues with any other equipment at my house. I use a tplink router running DD-WRT off of a Motorola cable modem. Everything has been rock solid other than the sporadic issues with the phone connection.

Thanks for the comments.

LD