Haven't heard of issues with the MWI voltage, but I've run across some other devices (loud bells and elevator phones in particular) that won't work with the lower ring voltage put out by the ONS ports. Fortunately in my case we have Per nodes as well and just run them off a Per ONS card, which puts out the full 90VAC that these devices are looking for.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.