Hi Genx,

I don't have any more info than you do, but for what it is worth, here are some things to check.

1. I had a whole ton of bad Linksys routers experiencing a variety of issues, including busy line on incoming calls. Those things overheat so easily. (An $8 desk fan does wonders!) Switched to Grandstream, and things are MUCH better now. You can also try changing to default ports in the reseller control panel. Then remotely resync or reboot the user's router.

2. If you port someone from another VOIP service, make sure you do away with the old VOIP router or modem/router. They muck up the works.

3. If you're behind another router at all, set your ATA to static IP and forward all the applicable ports through to it from the primary router.

4. I've had the best luck getting support via the reseller control panel. You can log in and submit trouble tickets there. They generally take a day to get to it lately. For non-reseller issues, I can usually ask quick questions using chat and get what I need to know.

Good luck!