Well how's this for a Valentine's Day greeting.
Massive reports of "no dialtone" bugs on Vonage.
The chronicles started several hours ago on the Vonage Forums, and they are continuing. The thread No Dialtone!! Anybody Else Having This Problem This Morning? now contains more than 100 posts- much of which are attesting the same.
ATA and adapter reboots attempted seem to be unsuccessful, at least so far.
Problem doesn't seem to be universal. Some readers are pinging me with "have had no problem, works fine" reports.
Still, this is hardly a confidence-inducer.
I'll be monitoring. More later.