unexpected call from "Asterix"

[stevech]

I wonder why I received a call with a CID/CNAM as Asterix (of server fame)? No recent calls made; no voice mail, etc. Of course, when I went off-hook to talk to Mr. or Ms. Asterisx, there was silence.

After-wards, outgoing calls all got a fast busy; incoming OK.
Power cycled the GS ATA and all seems normal now. (It's on the LAN side of the router.)
Hadn't been fiddling with LAN or router; no ISP service outages or IP address change.