I am also one of the 10%.
My GS is behind a Linksys router and cable modem and has become unregistered with each of these network glitches as well as several other times. My concern in having it in front of the router was based on my CIO experience- test any new piece of gear carefully. If you have an alternative, don't put it in a critical spot. I understood the potential for manual interaction when placed behind a NAT and was comfortable with it. Without knowing the intimate details of the ATA configuration, there should be several reliable methods to "call home" without too much overhead required by the servers or the ATA.

That being said, I am out of state much of the time and my dear technophobic wife has been saddled with the responsibility of manually resetting the ATA when it becomes disabled. Even though I was able to tell her about the ***999 phone based reset, the reliability concerns are rapidly degrading the WAF of our internet phone initiative.

The PAP2T looks good since it has a proven "call home" feature- especially tested recently. If it does, the WAF will steadily rise.

Thanks for staying on top of this.