I am shopping for a new flashing light adapter for the Vodavi Starplus STS phones. I used to have a Radioshack Fone Flasher 2, but it died.

I found one that might work, I'm not sure though and don't want to buy them if they won't.
They will work if the voltage on the phone line, when it is ringing, gets above 28 volts. Anyone know the voltage on the line when it is ringing?
OR
does anyone know of a flasher that does work well?

Thanks