Cables have RJ11 both ends with an adapter to plug into BT style socket.
AT&T 2500MMGL Vintage Corded Single Land Line Telephone For Home and Office Use
Land Line Telephone - Single blue telcom ren 1 model 310
Vintage 1990s Lenoxx sound big button telephone 3 memory land line
VTG Code-A-Phone Land Line Corded Desk Wall Telephone Speaker Phone Model 8100
Vintage Walt Disney Mickey Mouse Phone Telephone Wall Hookup REAL Land Line
Vintage 1970's Technico Push Button Telephone, Green Model Land Line.
