https://www.bogen.com/products/pdfs/telephonepagepdfs/TAMBs.pdf
https://www.bogen.com/products/pdfs/telephonepagepdfs/TAMBm.pdf

The Bogen TAM-B will connect to a CO line and the Viking can if you do modifications with the ring relay The TAM gives many options for hook up


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.