My ATA goes off-line anytime my router or internet service goes down (which is 99% my router rebooting). It is definitly related to the router settings in timeouts of types of packets. Lots of posts on this topic in dslreports.com and here. I am running a Linksys router with Tomato 1.28, which I really like, but have not been able to figure out the settings for the Voipo supplied Linksys ATA to recover automatically.

I use the cell phone failover approach and know when the ATA has lost registration. Rebooting the ATA does not work (i.e. reboot or remove/replace power immediately as there is some type of connection still open on the router. If I remove power, wait about 20 seconds, then replace power, ATA registers -- OR, if I login to ATA (while in unregistered state), change IP address, save and reboot, ATA will register.

If anyone has any ideas to try, I am all ears. Yes, I know, I could put in a different router -- so besides that.....

-bird.