No devices registered in Vpanel

[dbmaven]

Spoke too soon.

I've now duplicated the sequence of events that caused it to go out.

I call my VOIPO line from my MagicJack.
I don't answer, and let it go to voicemail.
Line 2 is active (light is 'on' on the PAP2T).
I go to vPanel, and play the voicemail online.
Line 2 is still active.
As soon as I delete the voicemail, Line 2 light goes out, and the PAP2T status page shows:
Display Name: User ID: ##########B
Hook State: On Registration State: Can't connect to login server
Last Registration At: 2/23/2009 21:40:54 Next Registration In: 9 s
Message Waiting: No Call Back Active: No

The same sequence caused it both times - so it wouldn't appear to be the specific port.

Edit to add:
MagicJack not installed.
I pulled power from the ATA.
I rebooted my router to clear any 'active' ports.
After applying power to the ATA, both lines went active.

I then called my VOIPO number from my cell phone, and repeated the steps above.
Before deleting the message (while it was still playing, actually) Line 2 went dead and shows the same result in the PAP2T status page.
Doesn't appear to be related to the MagicJack or even a specific port....
Reset the ATA and router, both ports active. I'll monitor to see if Line 2 stays up.