I've seen this a couple of times - an incoming call on my VOIPo line, everything rings, none can actually answer successfully (Line 1, Line 2 or XLite) - and then the PAP2T fails to re-register both lines. Seems to be 'mass confusion' going on.

I searched and could not find any 'current' specifications for setting up XLite.
Could someone from Voipo post the specific configuration settings necessary - ideally screen shots of the dialogs. Maybe it could even be added to the FAQ so that it's easy to find for those who need/want it.

I'm reasonably sure that something is askew with the XLite config - which is why I didn't feel it necessary to open a support ticket.