Quote Originally Posted by nobaloney View Post
Amazon sells the "Walker Clarity Extra Loudtelephone Ringer" which should work. You may need to buy a line splitter so you can plug both the ringer and your phone into your ATA.

Note that I've never owned this, but I took the time to look it up for you, for this, my first post on these forums.
So I asked Clairity directly about their device working on voip.

OC_Carl Will this device work with a voip line?
Karen
ยท 2 hours ago
The WR100 works on analog telephone lines only.

So I am glad I did not run out to Fry's or try to order anywhere else. I'm thinking most if not all mainstream external ringers will not work with voip unless it specifically says it does. By default it seems they do not.

So unless someone actually has an external ringer they found works with the voipo Grandstream or voipo itself can either reveal the bad news they know of no external ringer working with their network, or they do know of a product (maybe their own) that would, I am <you know>.